Tuners? P0894?
08-13-2012, 02:19 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Nov 2011
Location: Douglasville, Ga
Posts: 507
Likes: 0
Received 0 Likes
on
0 Posts
Tuners? P0894?
P0894 question for tuners. I have replaced 2 new built transitions, I have also replaced 2 TC's, one was Hughes ( first built trans) and one is Circle D (in truck now less then 200 miles on it). I also replaced a valve body in the first trans. I'm getting the P0894 code in all these, but I only get it above 70MPH. I'm guessing it must be tune related. any thoughts to what might be setting it off? all this has been since march. It didn't do this with a stock trans and built motor just when I added a stronger trans and TQ. any thoughts on what to look for would be great. I truly feel it is in the tune and not mechanical. No the Circle D feels great but something happens somewhere around 70MPH.
08-13-2012, 11:33 PM
#4
Your issue is most likely still within the trans according to what I have read.
It could also be wiring or the computer. I have read several different fixes but could not pin point one solid repair. You said the trans was built??? What was done and did it??? Some more in site might help us tell you were to look.
I Found this bulletin when researching your code P0894
08-07-30-008: Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870 - (Feb 26, 2008)
Subject: Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870
Models: 2002-2007 GM Passenger Cars with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32 or M70)
Diagnostic trouble codes (DTC) P0894 and P1870, Transmission Component Slipping, may have different root causes. The following diagnostic tips are provided to assist in accurately repairing the condition.
• Corporate Bulletin Number 06-07-30-007 is intended for 2006 vehicles only. This bulletin provides diagnostic procedures to determine if the TCC enable solenoid is cracked.
• Slip speeds ranging from approximately 100 to 400 RPM at steady state light load driving are usually caused by the TCC not applying.
• Slip speeds greater than about 400 RPM at steady state driving are usually caused by a slipping clutch or band. Inspect the oil pan for the presence of excess clutch debris.
• A plugged or restricted TCC apply fluid orifice (238, located in the pump) may cause DTC P0894 or P1870, especially in low mileage vehicles with less than 8,000 km (5,000 mi).
• A converter clutch valve (224, located in the pump), which does not have full travel of 13 mm (0.5 in) or is stuck in the off position may cause DTC P0894 or P1870. Inspect the valve for chips, debris, nicks or burrs.
Also, inspect the springs (225 and 226) to make sure they are not limiting valve travel. A spring that is not fully wound may catch in the bore, limit valve travel and cause DTC P0894 or P1870.
• A cracked or leaking TCC solenoid (part of harness 66) may cause DTC P0894 or P1870. Use solenoid test kit J 44246 to test the operation of this solenoid.
• A cracked or leaking TCC PWM solenoid (396) may also cause DTC P0894 or P1870.
• If the vehicle has 24,000 miles (38,600 km) or more, and diagnostics have not determined another cause of the DTC, the torque converter should be replaced.
When attempting to diagnose a DTC P0894 or P1870, it is important to also refer to the appropriate Service Information (SI) document for further possible causes of this condition.
It could also be wiring or the computer. I have read several different fixes but could not pin point one solid repair. You said the trans was built??? What was done and did it??? Some more in site might help us tell you were to look.
I Found this bulletin when researching your code P0894
08-07-30-008: Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870 - (Feb 26, 2008)
Subject: Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870
Models: 2002-2007 GM Passenger Cars with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32 or M70)
Diagnostic trouble codes (DTC) P0894 and P1870, Transmission Component Slipping, may have different root causes. The following diagnostic tips are provided to assist in accurately repairing the condition.
• Corporate Bulletin Number 06-07-30-007 is intended for 2006 vehicles only. This bulletin provides diagnostic procedures to determine if the TCC enable solenoid is cracked.
• Slip speeds ranging from approximately 100 to 400 RPM at steady state light load driving are usually caused by the TCC not applying.
• Slip speeds greater than about 400 RPM at steady state driving are usually caused by a slipping clutch or band. Inspect the oil pan for the presence of excess clutch debris.
• A plugged or restricted TCC apply fluid orifice (238, located in the pump) may cause DTC P0894 or P1870, especially in low mileage vehicles with less than 8,000 km (5,000 mi).
• A converter clutch valve (224, located in the pump), which does not have full travel of 13 mm (0.5 in) or is stuck in the off position may cause DTC P0894 or P1870. Inspect the valve for chips, debris, nicks or burrs.
Also, inspect the springs (225 and 226) to make sure they are not limiting valve travel. A spring that is not fully wound may catch in the bore, limit valve travel and cause DTC P0894 or P1870.
• A cracked or leaking TCC solenoid (part of harness 66) may cause DTC P0894 or P1870. Use solenoid test kit J 44246 to test the operation of this solenoid.
• A cracked or leaking TCC PWM solenoid (396) may also cause DTC P0894 or P1870.
• If the vehicle has 24,000 miles (38,600 km) or more, and diagnostics have not determined another cause of the DTC, the torque converter should be replaced.
When attempting to diagnose a DTC P0894 or P1870, it is important to also refer to the appropriate Service Information (SI) document for further possible causes of this condition.
08-14-2012, 06:51 AM
#5
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Nov 2011
Location: Douglasville, Ga
Posts: 507
Likes: 0
Received 0 Likes
on
0 Posts
Your issue is most likely still within the trans according to what I have read.
It could also be wiring or the computer. I have read several different fixes but could not pin point one solid repair. You said the trans was built??? What was done and did it??? Some more in site might help us tell you were to look.
It was gone thru both times with all new parts and upgraded parts. 2 different trans shops did the work. one the first time and the other the second. The fluid looks perfect.I even had a flush done on the first trans and had the valve body change on it from the one that was added from the recently rebuilt one.
I had the trans built completely upgraded everything added a Hughes converter. started slipping
I had a fluid flush from syn to dex ,still was slipping
I had the valve body swapped(new) and did another fluid flush from dex to dex still slipping
I had another trans built upgraded everything by another trans shop and added a Circle d converter. still slipping.
• Slip speeds ranging from approximately 100 to 400 RPM at steady state light load driving are usually caused by the TCC not applying.
• Slip speeds greater than about 400 RPM at steady state driving are usually caused by a slipping clutch or band. Inspect the oil pan for the presence of excess clutch debris.
It could also be wiring or the computer. I have read several different fixes but could not pin point one solid repair. You said the trans was built??? What was done and did it??? Some more in site might help us tell you were to look.
It was gone thru both times with all new parts and upgraded parts. 2 different trans shops did the work. one the first time and the other the second. The fluid looks perfect.I even had a flush done on the first trans and had the valve body change on it from the one that was added from the recently rebuilt one.
I had the trans built completely upgraded everything added a Hughes converter. started slipping
I had a fluid flush from syn to dex ,still was slipping
I had the valve body swapped(new) and did another fluid flush from dex to dex still slipping
I had another trans built upgraded everything by another trans shop and added a Circle d converter. still slipping.
• Slip speeds ranging from approximately 100 to 400 RPM at steady state light load driving are usually caused by the TCC not applying.
• Slip speeds greater than about 400 RPM at steady state driving are usually caused by a slipping clutch or band. Inspect the oil pan for the presence of excess clutch debris.
I'm lost...
Last edited by BigDaddy0381; 08-14-2012 at 06:56 AM.
08-20-2012, 08:02 AM
#7
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Nov 2011
Location: Douglasville, Ga
Posts: 507
Likes: 0
Received 0 Likes
on
0 Posts
ANY more thoughts to a solution to this? anything I should have my tuner look at? I'm going to have the truck re tuned by another tuner this thursday. any suggestion I should mention to him?
Thread
Thread Starter
Forum
Replies
Last Post
