ABS and SES Light on DTCs C0055 B0540 Speedometer Inoperative - keywords display ecm IPC LH6 MIL TCM transmission UBEC VS VSS
| Subject: | ABS and SES Light On DTCs C0055 B0540 Speedometer Inoperative |
| Models: | 2005-2006 Buick Rainier |
| 2005-2006 Chevrolet Trailblazer and Trailblazer EXT |
| 2005-2006 GMC Envoy, Envoy XL, Envoy XUV and Envoy Denali |
| 2005-2006 Saab 9-7x |
This PI has been updated to remove the 2004 model year from the PI. 2004 Models have a different UBEC and there is no "15A TRANS" fuse. Please discard PIT3697A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
ABS and SES light on with DTCs C0055 B0540 stored and speedometer inoperative. This may be due to fuse 53, "15A TRANS", in the Underhood Accessory Wiring Junction Block found to be open. This fuse provides ignition 1 voltage to the ECM Module and Transmission Shift Solenoids. The only symptoms will be SES light, ABS light, Speedometer inoperative and the EBCM will have no VSS using the Tech 2. ECM and TCM will show the correct VSS value using the Tech 2.
Recommendation/Instructions:
Inspect fuse 53 in the Underhood Accessory Wiring Junction Block for an open. If fuse 53 is open, replace the fuse and inspect circuit 139 from the Junction Block to the TCM and Transmission for a short to ground. Refer to eSI document 1454646 for the schematic.
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.
