Originally Posted by
DGS
#PIC5630: Intermittent No Crank U0100 U0101 U0121 - (Apr 17, 2013)
Subject:
Intermittent No Crank U0100 U0101 U0121
Models:
2008 - 2012 Cadillac CTS
With 6-Speed Automatic Transmission
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A customer may comment about an intermittent no crank / no start and/or an intermittent SES lamp illuminated. Diagnostics may reveal a U0100, U0121 and/or a U0101 with a possible no communication with the TCM, EBCM, and/or ECM.
Recommendation/Instructions:
Please check the round connector at the transmission control module (Control Solenoid Valve Assembly) for possible High Speed LAN wire/wires that may be pushed out of the back of the connector.
After locating the high speed LAN wires gently pull out on the wires to make sure they are seated correctly. It has been noted that the terminals are pushed back out of the connector body with damaged lock tabs on the terminal. If this issue is confirmed, please replace the suspect terminal(s) and re-test.
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.