Start Stall DTC P1629 After Theft Deterrent Module Replacement - keywords ECM engine key program relearn TDM VTD

This PI was superseded to update models and model years. Please discard PIC3879A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

If Theft Deterrent Module (TDM) is replaced without following the proper published service procedures, the Manufactures Enable Counter (MEC) in the TDM will not be zero. If the MEC is not zero, the vehicle may start and stall with a DTC P1629 set in Engine Control Module (ECM).

The MEC status can be read using the Tech 2. The MEC is found under Module ID for the Theft Deterrent Module. If the Manufactures Enable Counter display is blank then the TDM has been programmed. If the Manufactures Enable Counter reads a value other than zero, then the TDM needs to be programmed. Refer to eSI Document ID # 1704081 for TDM programming procedure.

Note: During SPS programming the last thing to occur is for the MEC counter to be zeroed. If the MEC counter is not zero, then the TDM needs to be programmed or the ignition key can be cycled the number equal to the MEC counter. For example if the MEC counter is 85, then the ignition key would have to be cycled 85 times. If you are monitoring the MEC counter while cycling the key you have to back out of the menu with the MEC counter and then go back into it to refresh the MEC.

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.