Unable to SPS Program Any Module on Vehicles with the Allison LCT1000 Transmission - keywords BCM DDM DTC ECM error OnStar PCM reprogram TCM
| Subject: | Unable to SPS Program Any Module on Vehicles with the Allison LCT1000 Transmission |
| Models: | 2006 Chevrolet Silverado |
| 2006 GMC Sierra |
| with Allison LCT1000 Transmission (RPO MW7) |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
When programming any module on a truck equipped with a 6-Speed Allison Transmission, you may encounter SPS error messages and be unable to complete programming. This could be caused by the Transmission Control Module (TCM), for the Allison Transmission, waking up during programming and interrupting the procedure.
Recommendation/Instructions:
At this time, the only way to successfully program a module is to disconnect the 10 Amp TCM B fuse in the UBEC and continue with the programming process and when completed, reinstall the fuse.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
