A/T - Warning Message In Cluster, P074100 Stored In TCM
37 Transmission warning message in cluster, P074100 stored in TCM37 12 73
2031775/1
November 20, 2012.
Affected Vehicles
Condition
Customer may report transmission warning lamp illuminated in instrument cluster. DTC P074100 (Torque Converter Clutch Circuit Performance or Stuck Off) is stored in TCM.
Technical Background
Diagnostic error in TCM software.
Production Solution
Not applicable.
Service
1. Complete GFF. If DTC P074100 is the only fault stored in TCM, continue below. If other faults are stored, this TSB does not apply and continue with fault diagnosis by normal process.
2. Check the freeze frame data as follows: Vehicle Self Diagnosis >> Vehicle On Board Diagnostic >> 02 Gearbox Electronics >> 004 DTC Memory >> 004.01 Check DTC Memory >> Select Environmental Conditions - this will bring up a list of values. Scroll down, read and record transmission oil temp.
3. Clear fault codes and test drive.
4. If original freeze frame data shows fault was set at greater than 140°F (60°C), or if the fault returns after being cleared, create a TAC ticket, attach the GFF log along with the freeze frame data and call into Technical Assistance Center.
5. If freeze frame data shows the fault was set with transmission oil temp at 140°F (60°C) or less, this is a known concern and there is no repair available at this time. Instruct the customer that this condition is known, and a solution is under development and has no influence on performance or driving behavior.
Warranty
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.