No Start Gauges Inop Warning Messages - keywords high lan speed U0073 U0100 U0101 U0104 U0121 U0122 U0132 U0140 U1814 U2099
| Subject: | No Start, Gauges Inop, Warning Messages |
| Models: | 2006- 2007 Buick Lucerne and Cadillac DTS |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A customer may comment about one or more of the following concerns. These concerns may be intermittent:
| • | The engine will not start/ crank over. |
| • | Instrument Panel Cluster gauges are inoperative. |
| • | SERVICE STABILITRAK, SERVICE SUSPENSION SYS, SERVICE TRACTION CONTROL may be displayed on the Driver Information Center (DIC). |
One or more of the following DTC may be stored:
U0073 | 00 | High Speed Communication Bus |
U0100 | 00 | Lost Communication With Engine/Powertrain Control Module (ECM/PCM) |
U0101 | 00 | Lost Communication With Transmission Control Module (TCM) |
U0104 | 00 | Lost Communication With Cruise Control Module |
U0121 | 00 | Lost Communication With Electronic Brake Control Module (EBCM) |
U0122 | 00 | Lost Communication With Vehicle Dynamics Control Module |
U0132 | 00 | Lost Communication With Ride Level Control Module |
U0140 | 00 | Lost Communication With Body Control Module (BCM) |
U1814 | 00 | Powertrain High Speed Communication Enable Circuit |
U2099 | 00 | High Speed Communication Enable Circuit |
Recommendation/Instructions:
Open and inspect C111 Body Harness to the Engine Harness for poor connections. Gently tug on each wire going into and out of the connector to ensure each terminal is locked into the connector, and that the terminals are not pushing out when the connector is closed and the lever is locked. C111 is located on the LF Strut Tower in the Engine Compartment.
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.
