2005 LLY Duramax - I've had an occasional problem that's left me on the side of the road twice where the accelerator pedal stops responding. I have my V2 hooked up, and when this happens the throttle position reads 0% regardless of pedal position.

I scanned the ECM and have the following codes:

P2133 - Accelerator Pedal Position (APP) Sensor 3 Circuit High Voltage
P2139 - Throttle/Pedal Pos Sensor/Switch D / F Voltage Correlation
P2140 - Throttle/Pedal Pos Sensor/Switch E / F Voltage Correlation

Has anyone experienced this before? I can try to troubleshoot by checking voltages and such but being an intermittent problem I am not sure that I will find anything unless I happen to get lucky and catch it while it's happening.

 

Sounds like a bad APP sensor or shorted wire with 1 signal being out of correlation with the other 2. I guess you could log the 3 APP sensor signal voltages to see what they are doing. Can you view the freeze frame data from when the DTCs were set?

 

DTC Freeze Frame Data
Powertrain Control Module (PCM)($10)
P2133 - Accelerator Pedal Position (APP) Sensor 3 Circuit High Voltage
DESCRIPTION METRIC UNITS IMPERIAL UNITS
Subsystem Category Of DTC P
Calculated Load Value 0 %
Engine Coolant Temperature -40 °C -40 °F
Intake Manifold Absolute Pressure 95 kPa 13.8 PSI
Engine RPM 0 RPM
Vehicle Speed Sensor 0 KMH 0 MPH
Intake Air Temperature 35 °C 95 °F
Air Flow Rate From Mass Air Flow Sensor 112.25 Grams/s 14.85 Lbs/Min
Unused
Fuel Rail Pressure 1.6 MPa 229.16 PSI
Intake Air Heater Relay Off
Battery Voltage 11.1 V
Exhaust Gas Recirculation Valve Sensor Voltage 3.1 V
Fuel Temperature 34 °C 93 °F
Throttle Position 0 %
Exhaust Gas Recirculation Valve Position 0 %
Battery Voltage 11.1 V
Accelerator Pedal Position Sensor 2 Voltage 4.6 V
Accelerator Pedal Position Sensor 3 Voltage 5 V
Glow Plug Feedback Voltage 0 V
Boost Pressure 95 kPa 13.8 PSI
Engine Coolant Temperature At Startup 35 °C 95 °F
EGR Commanded Opening 100 %
Desired Idle Speed 688 RPM
Injector Pulse Width Injector 1 0 ms
Injector Pulse Width Injector 2 0 ms
Injector Pulse Width Injector 3 0 ms
Injector Pulse Width Injector 4 0 ms
Injector Pulse Width Injector 5 0 ms
Injector Pulse Width Injector 6 0 ms
Injector Pulse Width Injector 7 0 ms
Injector Pulse Width Injector 8 0 ms
Desired Exhaust Gas Recirculation Valve Position 0 %
Engine Run Time 0 Seconds
Exhaust Gas Recirculation Learned Pintle Position Voltage 0 V
Exhaust Gas Recirculation Pintle Position Error 0 %
Crank Sensor Pulses Missed 0 Counts
Warm-up Cycles Without Emissions Fault 0 Counts
Warm-up Cycles Without Non-Emissions Fault 1 Counts
Odometer When First Code Set, Since Cleared 2910 Km 1808 Miles
Mileage Since Last Code Cleared 2680 Km 1665 Miles
Odometer When Last Code Set Was Cleared 2910 Km 1808 Miles
Freeze Frame Counter 11 Counts
Freeze Frame Pass Counter 13 Counts
Freeze Frame Not Run Counter 0 Counts
Barometric Pressure 96 kPa 13.9 PSI

 

DTC Freeze Frame Data
Powertrain Control Module (PCM)($10)
P2139 - Accelerator Pedal Position (APP) Sensor 1-3 Correlation
DESCRIPTION METRIC UNITS IMPERIAL UNITS
Subsystem Category Of DTC P
Calculated Load Value 9.4 %
Engine Coolant Temperature 41 °C 106 °F
Intake Manifold Absolute Pressure 97 kPa 14.1 PSI
Engine RPM 870 RPM
Vehicle Speed Sensor 11 KMH 7 MPH
Intake Air Temperature 31 °C 88 °F
Air Flow Rate From Mass Air Flow Sensor 61.32 Grams/s 8.11 Lbs/Min
Unused
Fuel Rail Pressure 41.3 MPa 5992.97 PSI
Intake Air Heater Relay Off
Battery Voltage 14 V
Exhaust Gas Recirculation Valve Sensor Voltage 0.7 V
Fuel Temperature 38 °C 100 °F
Throttle Position 26.7 %
Exhaust Gas Recirculation Valve Position 0 %
Battery Voltage 14 V
Accelerator Pedal Position Sensor 2 Voltage 4.1 V
Accelerator Pedal Position Sensor 3 Voltage 3.9 V
Glow Plug Feedback Voltage 0 V
Boost Pressure 97 kPa 14.1 PSI
Engine Coolant Temperature At Startup 39 °C 102 °F
EGR Commanded Opening 0 %
Desired Idle Speed 800 RPM
Injector Pulse Width Injector 1 0.641 ms
Injector Pulse Width Injector 2 0.702 ms
Injector Pulse Width Injector 3 0.626 ms
Injector Pulse Width Injector 4 0.641 ms
Injector Pulse Width Injector 5 0.656 ms
Injector Pulse Width Injector 6 0.641 ms
Injector Pulse Width Injector 7 0.763 ms
Injector Pulse Width Injector 8 0.809 ms
Desired Exhaust Gas Recirculation Valve Position 0 %
Engine Run Time 42 Seconds
Exhaust Gas Recirculation Learned Pintle Position Voltage 0.8 V
Exhaust Gas Recirculation Pintle Position Error 0 %
Crank Sensor Pulses Missed 0 Counts
Warm-up Cycles Without Emissions Fault 0 Counts
Warm-up Cycles Without Non-Emissions Fault 1 Counts
Odometer When First Code Set, Since Cleared 2855 Km 1774 Miles
Mileage Since Last Code Cleared 2740 Km 1703 Miles
Odometer When Last Code Set Was Cleared 2855 Km 1774 Miles
Freeze Frame Counter 2 Counts
Freeze Frame Pass Counter 10 Counts
Freeze Frame Not Run Counter 0 Counts
Barometric Pressure 96 kPa 13.9 PSI

 

DTC Freeze Frame Data
The PCM may save a Freeze Frame (snapshot) of some parameters' values when a Diagnostic Trouble Code is set.
Up to six Freeze Frames are stored in the PCM. If more than six Freeze Frames are saved then the oldest frame is discarded first.


Powertrain Control Module (PCM)($10)
P2140 - Accelerator Pedal Position (APP) Sensor 2-3 Correlation
DESCRIPTION METRIC UNITS IMPERIAL UNITS
Subsystem Category Of DTC P
Calculated Load Value 9.4 %
Engine Coolant Temperature 41 °C 106 °F
Intake Manifold Absolute Pressure 97 kPa 14.1 PSI
Engine RPM 857 RPM
Vehicle Speed Sensor 11 KMH 7 MPH
Intake Air Temperature 31 °C 88 °F
Air Flow Rate From Mass Air Flow Sensor 61.89 Grams/s 8.19 Lbs/Min
Unused
Fuel Rail Pressure 41.8 MPa 6056.79 PSI
Intake Air Heater Relay Off
Battery Voltage 14 V
Exhaust Gas Recirculation Valve Sensor Voltage 1.6 V
Fuel Temperature 38 °C 100 °F
Throttle Position 29 %
Exhaust Gas Recirculation Valve Position 0 %
Battery Voltage 14 V
Accelerator Pedal Position Sensor 2 Voltage 4 V
Accelerator Pedal Position Sensor 3 Voltage 4.7 V
Glow Plug Feedback Voltage 0 V
Boost Pressure 97 kPa 14.1 PSI
Engine Coolant Temperature At Startup 39 °C 102 °F
EGR Commanded Opening 0 %
Desired Idle Speed 800 RPM
Injector Pulse Width Injector 1 0.641 ms
Injector Pulse Width Injector 2 0.641 ms
Injector Pulse Width Injector 3 0.626 ms
Injector Pulse Width Injector 4 0.641 ms
Injector Pulse Width Injector 5 0.656 ms
Injector Pulse Width Injector 6 0.641 ms
Injector Pulse Width Injector 7 0.656 ms
Injector Pulse Width Injector 8 0.809 ms
Desired Exhaust Gas Recirculation Valve Position 0 %
Engine Run Time 43 Seconds
Exhaust Gas Recirculation Learned Pintle Position Voltage 0.8 V
Exhaust Gas Recirculation Pintle Position Error 0 %
Crank Sensor Pulses Missed 0 Counts
Warm-up Cycles Without Emissions Fault 0 Counts
Warm-up Cycles Without Non-Emissions Fault 2 Counts
Odometer When First Code Set, Since Cleared 2855 Km 1774 Miles
Mileage Since Last Code Cleared 2855 Km 1774 Miles
Odometer When Last Code Set Was Cleared 2855 Km 1774 Miles
Freeze Frame Counter 1 Counts
Freeze Frame Pass Counter 4 Counts
Freeze Frame Not Run Counter 0 Counts
Barometric Pressure 96 kPa 13.9 PSI

 

Screenshot of the APP sensor voltages. This was done with engine off. Sensor 3 voltage stays at 5v regardless of throttle position, but in the freeze frame data above it's not 5v. Does this tell me anything?

 

I just took the connector apart at the pedal and probed the sensor 3 signal wire. The position sensor is working correctly, the voltage shown on my multimeter is different than what I was seeing on the scan tool. I disconnected and reconnected the under-hood connector and got signal to the ECM again for sensor 3, so I think it's just an intermittent connection issue at that connector. It's working again for now, will see if it happens again.

 

If the ECM is seeing 5V the signal circuit is shorted to a 5V circuit....should never go all the way to 5V. Maybe you got a Toyota sensor...LOL Tin whiskers

 

What was the outcome of this?

 

I have switched pedal harnesses and pedal position sensors. Now I'm getting P2138 and P2140 instead of the original codes. I just replaced the pedal position sensor a few days ago, so I am going to drive it like this and see if it still cuts out. I logged voltage on all three circuits and they are all getting signal, so I'm not sure why the codes are there. SO far it seems to be driving ok though. If it still has issues I am going to have to trace the wiring from the ECM to the pedal harness connector under the hood and see if there's a short or damaged wire somewhere.