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 MANUALSCHEVROLET2025TAHOE COMMERCIAL, 4WDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSSUSPENSION CONTROLS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C119DCIRCUIT/SYSTEM TESTING
2025 Chevrolet Tahoe Commercial, 4WD
Circuit/System Testing
2025 Chevrolet Tahoe Commercial, 4WDSECTION Circuit/System Testing
- Ignition OFF and all vehicle systems OFF. Disconnect the connector at the K5 Automatic Level Control Module:
- Test for infinite resistance between the following voltage reference circuits and ground.
- Circuit 1205
- Circuit 1208
- Circuit 1211
- Circuit 1214
- If less than infinite resistance
Repair the short to ground on the appropriate circuit.
- Go to next step: If infinite resistance
- Replace the K5 Automatic Level Control Module.
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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.