Service VME - DTC U1016 - keywords 2.8 3.6 communication door ECM history LP1 LY7

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

This message concerns 2006 Cadillac CTS, SRX and STS with LP1, LY7 V6 engine. While diagnosing for drivability or other concerns, technicians may note a U1016 diagnostic trouble code in history. This code may be caused by a door or other module not responding to the state of health message which has been sent by the ECM. This concern will not turn on the check engine light, or cause other symptoms for this code alone. Do not replace the ECM or door module for a U1016 DTC stored in history. Follow routine diagnostic procedures to correct the customer's original concern and clear all stored DTCs when done.

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.