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.
Diagnostic Fault Information
2009 Chevrolet Tahoe Base, 4.8 CSECTION Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| B+ | 1 | U1815/U1816 | - | - |
| B+ | 1 | U1815/U1816 | - | - |
| Ignition | 1 | U1815/U1816 | - | - |
| Module Ground Strap | - | U1815/U1816 | 1 | - |
| High Speed hybrid GMLAN Serial Data (+) | U0074 | U1815/U1816 | U0074 | - |
| High Speed hybrid GMLAN Serial Data (-) | U0074 | U1815/U1816 | U0074 | - |
| Hybrid Module Wake-up Signal | B137A | U1815/U1816 | - | - |
| 1. Multiple symptoms may occur due to open fuses. | ||||
RENDER: 1.0x
NO RELATED
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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.