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.
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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U209ADIAGNOSTIC FAULT INFORMATION
2009 Chevrolet Tahoe Base, 4.8 C
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 |
|---|---|---|---|---|
| Ignition Voltage (Circuit 2139) | P2534* ** | P2534** | U209A** or B1453 | - |
| Ignition Voltage (Circuit 239) | B1453* ** | B1453** | U209A** or B1453 | - |
| Communication Enable Signal (Circuit 5986) | U209A** or U2099 | U209A** | - | - |
| Wake Up Signal (Circuit 5985) | U1814* | U1812* | U209A* | - |
| * Circuit fuse will open ** May set other module/DTCs. |
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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.