No Communication With ECM Or TCM DTC U2105 P0700 U0101 U2100 U0073 U0001 - keywords 5.3L 6.0L adjust adjustable connector data DLC LH6 link LQ9 pedal resistor
| Subject: | No Communication with ECM or TCM DTC U2105 P0700 U0101 U2100 U0073 U0001 |
| Models: | 2005-2007 Buick Rainier |
| 2005-2007 Chevrolet Trailblazer, Trailblazer EXT and Trailblazer SS |
| 2005-2007 GMC Envoy, Envoy XL, Envoy XUV and Envoy Denali |
| 2005-2007 Saab 97x |
This PI Supercedes To Include 2007 Models. Please Discard PIT3744.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
No communication with ECM or TCM and possible DTCs U2105 P0700 U0101 U0073 U2100 U0001. This concern may be intermittent and difficult to verify. This concern is only on vehicles with a V8 engine. Using the adjustable pedals (if equipped) may induce this concern.
Recommendation/Instructions:
Inspect the GMLAN terminating resistor located several inches from the Data Link Connector. Further inspection at or near the adjustable pedal bracket or steering column area may reveal a bare end of the terminating resistor visible. Movement of the adjustable pedal assembly can cause damage to the tape and subsequent shorting to ground of the communication circuit. Protect the resistor and reroute to prevent further contact of the terminating resistor to ground. Refer to eSI Document ID # 1454971 for the Data Link Connector on V8 Engines.
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.
