allison transmission control module problems

#Allison transmission control module problems install#

The TCM ONLY NEEDS to be replaced if it has incurred permanent damage, such as hard failed codes, complete loss of communication or other erratic behavior that continues to exist AFTER completing the following steps.ġ. Important: DO NOT replace the transmission control module (TCM) until the root cause of the problem has been properly resolved. This electrostatic charge can discharge and cause DTC P0880 and/or DTC U0101 to set and be accompanied by any of the above symptoms. An aftermarket serpentine belt was intentionally installed, due to dimension changes from added aftermarket equipment such as a second alternator or clutch pump installed by an upfitter.Certain brands of replacement aftermarket serpentine belts are made of compounds that will reduce the opportunity for audible belt noise, however these compounds can generate significant amounts of electrostatic charge on their surface.

During normal servicing, the OEM General Motors serpentine belt was replaced by an aftermarket serpentine belt.Resistance in the G102 ground connection on the side of the engine block.The technician may observe on a scan tool DTC P0880 and/or DTC U0101 set as Current or in History. Some customers may comment that the transmission will intermittently hesitate, clunk, gets stuck in gear or in neutral, won't shift, or experience reduced torque or range inhibit. The following information may be helpful if the vehicle exhibits the symptoms described in this PI.

#Allison transmission control module problems install#

Subject: Loss of Communication with Allison Transmission Control Module (TCM), Intermittent Transmission Hesitation, Reduced Torque, Range Inhibit, Clunk, Stuck in Gear or in Neutral, Won't Shift, DTC P0880 and/or U0101 Set (Inspect for Electrostatic Discharge (ESD) From Aftermarket Serpentine Belts and/or Added Equipment, Install OEM Belt, Relocate TCM)Įquipped with Allison® A1000 Automatic Transmission RPO MW7Īttention: Please review the latest version of Corporate Bulletin Number 04-06-04-054B: Info - Non-GM Parts and Accessories (Aftermarket), for information regarding GM's policy on the use and installation of aftermarket components. This PI is being revised to add G102 information to the Condition/Concern and Recommendation/Instructions. If it is the belt possibly i want to replace it with a stock belt and see if the issue clears up before taking it in to the dealer. Does anyone have any info on this or ever experienced it. I have been told that there is a TSB on aftermarket belts that could cause this due to static discharge. The truck has dual alternators and i put the gator-back belt on it. I have been told that this could be due to the aftermarket belt i put on. I have an edge insight monitor only no programmer.

Both times it resets after letting it sit for a few minutes and runs for a week or more between instances. The trans is stuck in one gear and shifting to reverse is very harsh. The back-up sensors start beeping and the brake, ABS, check engine lights come on the dash and the transmission display goes blank. Since returning i have had 2 instances first thing in the morning when i start it. I recently changed the serpentine belt and air filter for a trip. I have an 09 LMM stock except for a cat back exhaust.