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.
2014 Chevrolet Tahoe LS, RWDFACTORY OEM SERVICE PROCEDURE
Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| ECM B+ | U1886*, U0100 in HPCM | U1886*, U0100 in HPCM | - | - |
| ECM Ground | - | U1886*, U0100 in HPCM | - | - |
| ECM Wake Up Signal (circuit 5985) | U1886* in HPCM, U1814 in BCM | U1886*, U0100 in HPCM | - | - |
| HSGMLAN + (circuit 2500) | 1* | U1886*, U0100 in HPCM | 1* | - |
| HSGMLAN - (circuit 2501) | 1* | U1886*, U0100 in HPCM | 1* | - |
| * Other modules/DTCs will set with this fault. 1. Scan tool does not communicate with high speed GMLAN device. |
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Factory Service Tools
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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.