p1400 on a 2012 6.2 any ideas?
06-19-2012, 02:24 PM
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p1400 on a 2012 6.2 any ideas?
I have a bone stock 2012 Silverado with a 6.2 with 4000 miles showing. No mods at all. Just started two days ago...runs poorly cold,low idle,stalls hesitates, flashing and now on all the time mil. I have always run 93 octane Shell fuel. Code p1400 stored. Its at the dealer now...they dont know what to do... 
Any ideas??
Thanks,
Scott
Any ideas??
Thanks,
Scott
06-19-2012, 03:15 PM
#3
Service Information
Home Publications Number Search New Bulletins Bulletin Search Feedback Help
2012 Chevrolet Silverado - 4WD | Cheyenne, Sierra, Silverado VIN C/K Service Manual | Document ID: 2679844
#10-06-04-008B: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate ECT Sensor and Engine Coolant Heater Cord) - (Jun 22, 2011)
Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord)
Models: 2006-2007 Buick Rainier
2009 Buick LaCrosse Super, Allure Super (Canada Only)
2006-2012 Cadillac Escalade
2006-2007 Chevrolet Monte Carlo
2006-2009 Chevrolet Impala SS, TrailBlazer
2006-2012 Chevrolet Avalanche, Express, Silverado, Tahoe
2006-2009 GMC Envoy
2006-2012 GMC Savana, Sierra, Yukon
2006-2008 Pontiac Grand Prix
2006-2009 Saab 9-7X
Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6
Please Refer to GMVIS
Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord.
This bulletin is being revised to update the model years to 2012. Please discard Corporate Bulletin Number 10-06-04-008A (Section 06 – Engine/Propulsion System).
Condition
Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of −23 to −40°C (−10 to −40°F) or colder.
The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History.
Cause
This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range.
Correction
Important: DO NOT replace the ECM for this condition.
Relocating the ECT Sensor
1. Turn ON the ignition with the engine OFF.
2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI.
⇒ If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3.
⇒ If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI.
3. Turn OFF the ignition.
Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot.
4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
6. Place a clean drain pan under the radiator drain **** or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI.
7. Loosen the radiator drain **** if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator.
8. Remove the end of the lower radiator hose from the radiator.
9. Drain the engine coolant sufficiently below the level of the ECT sensor.
10. Close the radiator drain **** or connect the lower radiator hose at the radiator.
11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose.
12. Lower the vehicle.
Object Number: 1950786
Click here for detailed picture of above image.
13. Disconnect the wiring harness connector from the ECT sensor (2).
Object Number: 1950891
Click here for detailed picture of above image.
14. Remove the ECT sensor (1) from the front of the cylinder head.
15. Remove the corresponding size plug at the rear of the OTHER cylinder head.
16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
17. Install the ECT sensor in the hole of the cylinder head where the plug was removed.
Tighten
Tighten to 20 N·m (15 lb ft).
18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
19. Install the plug in the hole of the cylinder head where the ECT sensor was removed
Tighten
Tighten to 20 N·m (15 lb ft).
Important: Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice.
20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring.
21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit.
Note: This step is to set up and verify the length of wiring that is required before cutting.
22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required.
23. Cut the ECT sensor jumper wires to the appropriate length.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
26. Connect the ECT sensor harness connector to the ECT sensor.
27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps.
Important: You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed.
28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI.
29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI.
30. Use a scan tool to clear any DTCs.
Relocating the Engine Coolant Heater Cord
Important: For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above.
1. Turn OFF the ignition.
2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length.
3. Obtain an extension cord with the following features:
• 120 volt
• 14/3 gauge
• 15A capacity
• Three prong
• Polarized plug and receptacle
• Chemical resistant
• Grounded terminals
• Designed for use in a cold outdoor environment
• Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight
• Maximum length of 2.5-3 m (8-10 ft)
4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning.
5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent.
6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease.
Object Number: 2390015
Click here for detailed picture of above image.
7. Wrap electrical tape around the connection as shown.
Object Number: 2390016
Click here for detailed picture of above image.
8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown.
Object Number: 2390014
Click here for detailed picture of above image.
9. Continue to route the extension cord to the exit location desired by the customer as shown.
10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it.
11. Secure the engine coolant heater cord and the extension cord with tie straps as needed.
12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length.
Part Information
The extension cord may be obtained at any of the following outlets:
• Lowes*
• Home Depot*
• Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10
USA: Cords should bear the UL symbol.
Canada: Cords should bear the ULc symbol or CSA approval.
*We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources.
Home Publications Number Search New Bulletins Bulletin Search Feedback Help
2012 Chevrolet Silverado - 4WD | Cheyenne, Sierra, Silverado VIN C/K Service Manual | Document ID: 2679844
#10-06-04-008B: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate ECT Sensor and Engine Coolant Heater Cord) - (Jun 22, 2011)
Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord)
Models: 2006-2007 Buick Rainier
2009 Buick LaCrosse Super, Allure Super (Canada Only)
2006-2012 Cadillac Escalade
2006-2007 Chevrolet Monte Carlo
2006-2009 Chevrolet Impala SS, TrailBlazer
2006-2012 Chevrolet Avalanche, Express, Silverado, Tahoe
2006-2009 GMC Envoy
2006-2012 GMC Savana, Sierra, Yukon
2006-2008 Pontiac Grand Prix
2006-2009 Saab 9-7X
Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6
Please Refer to GMVIS
Attention: To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord.
This bulletin is being revised to update the model years to 2012. Please discard Corporate Bulletin Number 10-06-04-008A (Section 06 – Engine/Propulsion System).
Condition
Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of −23 to −40°C (−10 to −40°F) or colder.
The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History.
Cause
This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range.
Correction
Important: DO NOT replace the ECM for this condition.
Relocating the ECT Sensor
1. Turn ON the ignition with the engine OFF.
2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI.
⇒ If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3.
⇒ If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI.
3. Turn OFF the ignition.
Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot.
4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
6. Place a clean drain pan under the radiator drain **** or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI.
7. Loosen the radiator drain **** if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator.
8. Remove the end of the lower radiator hose from the radiator.
9. Drain the engine coolant sufficiently below the level of the ECT sensor.
10. Close the radiator drain **** or connect the lower radiator hose at the radiator.
11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose.
12. Lower the vehicle.
Object Number: 1950786
Click here for detailed picture of above image.
13. Disconnect the wiring harness connector from the ECT sensor (2).
Object Number: 1950891
Click here for detailed picture of above image.
14. Remove the ECT sensor (1) from the front of the cylinder head.
15. Remove the corresponding size plug at the rear of the OTHER cylinder head.
16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
17. Install the ECT sensor in the hole of the cylinder head where the plug was removed.
Tighten
Tighten to 20 N·m (15 lb ft).
18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
19. Install the plug in the hole of the cylinder head where the ECT sensor was removed
Tighten
Tighten to 20 N·m (15 lb ft).
Important: Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice.
20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring.
21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured TO or WITHIN an existing protective conduit.
Note: This step is to set up and verify the length of wiring that is required before cutting.
22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to VERIFY the length that is required.
23. Cut the ECT sensor jumper wires to the appropriate length.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
24. Splice the ECT sensor jumper wires to the ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
25. Splice the ECT sensor jumper wires to the ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
26. Connect the ECT sensor harness connector to the ECT sensor.
27. Secure the ECT sensor jumper wires that are in their own protective conduit TO or WITHIN the existing harness conduit using tie straps.
Important: You MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine MUST then be allowed to cool down in order to top off the coolant level as needed.
28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI.
29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI.
30. Use a scan tool to clear any DTCs.
Relocating the Engine Coolant Heater Cord
Important: For reference, the procedure and graphics that are shown are from a Chevrolet Silverado, but are similar for the other vehicles listed above.
1. Turn OFF the ignition.
2. Ask the customer where they would prefer the extension cord to exit from the engine compartment in order to determine the required extension cord length.
3. Obtain an extension cord with the following features:
• 120 volt
• 14/3 gauge
• 15A capacity
• Three prong
• Polarized plug and receptacle
• Chemical resistant
• Grounded terminals
• Designed for use in a cold outdoor environment
• Outer jacket resistant to deterioration from moisture, abrasion and exposure to sunlight
• Maximum length of 2.5-3 m (8-10 ft)
4. Release enough of the clips that retain the engine coolant heater cord to the vehicle to provide the necessary length for repositioning.
5. Apply dielectric grease to the electrical contacts of the heater cord receptacle and the extension cord plug to prevent corrosion. Use GM P/N 12345579 (in Canada, use P/N 10953481) or an equivalent.
6. Connect the heater cord receptacle to the extension cord plug and wipe OFF any excess grease.
Object Number: 2390015
Click here for detailed picture of above image.
7. Wrap electrical tape around the connection as shown.
Object Number: 2390016
Click here for detailed picture of above image.
8. Route the engine coolant heater cord and extension cord behind the alternator and adjacent to the engine coolant crossover pipe as shown.
Object Number: 2390014
Click here for detailed picture of above image.
9. Continue to route the extension cord to the exit location desired by the customer as shown.
10. Review the routing of the coolant heater cord and extension cord to verify that it does not touch any sharp edges that could damage it.
11. Secure the engine coolant heater cord and the extension cord with tie straps as needed.
12. Resecure any of the original clips that retained the engine coolant heater cord to the vehicle that were released to provide length.
Part Information
The extension cord may be obtained at any of the following outlets:
• Lowes*
• Home Depot*
• Canada: Acklands-Grainger* (www.acklandsgrainger.com), Catalogue Part Number: CWRSJTOW3C14-10
USA: Cords should bear the UL symbol.
Canada: Cords should bear the ULc symbol or CSA approval.
*We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources.
06-19-2012, 03:15 PM
#4
Number Required
OR
Part Number
Description
Material Allowance
1
Polarized 120 Volt, 14/3, 2.5-3 m (8-10 ft), Outdoor Extension Cord*
$22.00
($25.00 Canada)
GM P/N 12346004 (Canadian P/N 10953480)
Silicone Sealant with Teflon 50 cc (1.69 oz)
Per: Repair $2.50**
GM P/N 12345579 (Canadian P/N 10953481)
Dielectric Grease
*Reimbursement for the extension cord must be claimed as a 'net item'. (actual cost to a maximum of the material allowance).
**The material allowance listed for the silicone sealant and the dielectric grease is for BOTH items.
Warranty Information (excluding Saab Models)
For vehicles repaired under the 5 year / 100,000 mile (160,000 km) powertrain warranty, use:
Labor Operation
Description
Labor Time
J7935*
Reposition ECT Sensor and Engine Coolant Heater Cord
1.3 hrs**
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
** This time includes routing and splicing of the ECT sensor circuits.
Warranty Information (Saab Models)
For vehicles repaired under warranty, use:
Labor Operation
Description
Failed Object
Fault/Reason Code
Location Code
Warranty Type
Repair/Action Code
Labor Time
2622403*
Reposition ECT Sensor and Engine Coolant Heater Cord
26224
67
0
01
05
1.3 hrs**
*This labor operation number is for bulletin use only. It will not be published in Standard Times Mechanical (STM).
** This time includes routing and splicing of the ECT sensor circuits.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© 2012 General Motors. All rights reserved.
OR
Part Number
Description
Material Allowance
1
Polarized 120 Volt, 14/3, 2.5-3 m (8-10 ft), Outdoor Extension Cord*
$22.00
($25.00 Canada)
GM P/N 12346004 (Canadian P/N 10953480)
Silicone Sealant with Teflon 50 cc (1.69 oz)
Per: Repair $2.50**
GM P/N 12345579 (Canadian P/N 10953481)
Dielectric Grease
*Reimbursement for the extension cord must be claimed as a 'net item'. (actual cost to a maximum of the material allowance).
**The material allowance listed for the silicone sealant and the dielectric grease is for BOTH items.
Warranty Information (excluding Saab Models)
For vehicles repaired under the 5 year / 100,000 mile (160,000 km) powertrain warranty, use:
Labor Operation
Description
Labor Time
J7935*
Reposition ECT Sensor and Engine Coolant Heater Cord
1.3 hrs**
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
** This time includes routing and splicing of the ECT sensor circuits.
Warranty Information (Saab Models)
For vehicles repaired under warranty, use:
Labor Operation
Description
Failed Object
Fault/Reason Code
Location Code
Warranty Type
Repair/Action Code
Labor Time
2622403*
Reposition ECT Sensor and Engine Coolant Heater Cord
26224
67
0
01
05
1.3 hrs**
*This labor operation number is for bulletin use only. It will not be published in Standard Times Mechanical (STM).
** This time includes routing and splicing of the ECT sensor circuits.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© 2012 General Motors. All rights reserved.
06-19-2012, 03:16 PM
#5
Service Information
Home Publications Number Search New Bulletins Bulletin Search Feedback Help
2012 Chevrolet Silverado - 4WD | Cheyenne, Sierra, Silverado VIN C/K Service Manual | Document ID: 1985906
DTC P1400
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC P1400: Cold Start Emission Reduction Control System
Circuit/System Description
The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:
• Engine speed
• Spark advance
• Throttle position
• Engine airflow
• Engine coolant temperature
• Engine runtime
• Park/neutral position
• Vehicle speed
The actual model is then compared to the expected exhaust energy model.
Conditions for Running the DTC
• The engine is running, and a cold start has been detected.
• Vehicle speed is less than 2 km/h (1 mph).
• The engine is at idle with no input from the accelerator pedal.
• DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.
This DTC runs for 15 seconds within the first 2 minutes of start-up. This diagnostic runs once per trip when a cold start has been determined.
Conditions for Setting the DTC
The actual exhaust energy model does not match the expected exhaust energy model.
Action Taken When the DTC Sets
DTC P1400 is a Type A DTC.
Conditions for Clearing the MIL/DTC
DTC P1400 is a Type A DTC.
Reference Information
Description and Operation
Engine Control Module Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Diagnostic Aids
Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 120 seconds of engine run time may set this DTC.
Circuit/System Verification
1. Allow the engine to cool.
2. Start and idle the engine for at least 2 minutes.
3. DTC P1400 should run and pass.
Circuit/System Testing
• Inspect the air intake system for the following:
- Damage, restriction, or modification
- Dirty or deteriorating air filter element
- Crankcase ventilation system for correct operation—Refer to Crankcase Ventilation System Inspection/Diagnosis .
- Water intrusion
- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor
- Intake manifold leak
• Inspect the exhaust system for the following:
- Water intrusion
- Exhaust leak
- Damaged, restricted, modified or enhanced exhaust system—Refer to Symptoms - Engine Exhaust .
• Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
© 2012 General Motors. All rights reserved.
Home Publications Number Search New Bulletins Bulletin Search Feedback Help
2012 Chevrolet Silverado - 4WD | Cheyenne, Sierra, Silverado VIN C/K Service Manual | Document ID: 1985906
DTC P1400
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC P1400: Cold Start Emission Reduction Control System
Circuit/System Description
The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:
• Engine speed
• Spark advance
• Throttle position
• Engine airflow
• Engine coolant temperature
• Engine runtime
• Park/neutral position
• Vehicle speed
The actual model is then compared to the expected exhaust energy model.
Conditions for Running the DTC
• The engine is running, and a cold start has been detected.
• Vehicle speed is less than 2 km/h (1 mph).
• The engine is at idle with no input from the accelerator pedal.
• DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.
This DTC runs for 15 seconds within the first 2 minutes of start-up. This diagnostic runs once per trip when a cold start has been determined.
Conditions for Setting the DTC
The actual exhaust energy model does not match the expected exhaust energy model.
Action Taken When the DTC Sets
DTC P1400 is a Type A DTC.
Conditions for Clearing the MIL/DTC
DTC P1400 is a Type A DTC.
Reference Information
Description and Operation
Engine Control Module Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Diagnostic Aids
Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 120 seconds of engine run time may set this DTC.
Circuit/System Verification
1. Allow the engine to cool.
2. Start and idle the engine for at least 2 minutes.
3. DTC P1400 should run and pass.
Circuit/System Testing
• Inspect the air intake system for the following:
- Damage, restriction, or modification
- Dirty or deteriorating air filter element
- Crankcase ventilation system for correct operation—Refer to Crankcase Ventilation System Inspection/Diagnosis .
- Water intrusion
- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor
- Intake manifold leak
• Inspect the exhaust system for the following:
- Water intrusion
- Exhaust leak
- Damaged, restricted, modified or enhanced exhaust system—Refer to Symptoms - Engine Exhaust .
• Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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06-19-2012, 03:22 PM
#6
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well it has not been cold here in Austin in quite sometime...so the weather can be ruled out.
It looks like its a "general" code....as in many things can cause this.Pretty sad...havent even had the first oil change and this bs happens
It looks like its a "general" code....as in many things can cause this.Pretty sad...havent even had the first oil change and this bs happens
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06-22-2012, 12:13 AM
#10
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I haven't thrown the scanner on my truck but it has started acting mega pissy if you let it set for a few days and start it up.
It will fire but damm near sounds like it is flooded when it starts you can hear a pop in the intake every now and then and it idles like **** up and down and all kinds of cranky for a few seconds then settles down into it's normal cold high idle. Mine is a 2011 6.2 with 8500 on it so far.
It will fire but damm near sounds like it is flooded when it starts you can hear a pop in the intake every now and then and it idles like **** up and down and all kinds of cranky for a few seconds then settles down into it's normal cold high idle. Mine is a 2011 6.2 with 8500 on it so far.