Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 GMC Yukon Base, RWDFACTORY OEM SERVICE PROCEDURE
Data Link Communication DTCS
DATA LINK COMMUNICATION DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| U1016 | LOSS OF COMMUNICATIONS WITH PCM/VCM |
| U1026 | LOSS OF TRANSFER CASE SHIFT CONTROL MODULE CLASS 2 COMMUNICATION |
| U1041 | LOSS OF EBCM COMMUNICATION |
| U1192 | LOSS OF EVO/PASSLOCK CLASS 2 COMMUNICATION |
| U1255 | SERIAL DATA LINE MALFUNCTION |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.