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 MANUALSCHEVROLET2025SUBURBAN LS, RWDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSSUSPENSION CONTROLS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C1176CIRCUIT/SYSTEM TESTING
2025 Chevrolet Suburban LS, RWD
Circuit/System Testing
2025 Chevrolet Suburban LS, RWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the connector at the K5 Automatic Level Control Module, ignition ON/Vehicle in Service Mode.
- Test for less than 1 V between the K5 Automatic Level Control Module connector terminal 30 and ground.
- If 1 V or greater
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- If 1 V or greater
- Ignition OFF.
- Disconnect harness connector at the G4 Automatic Level Control Air Compressor.
- Test for infinite resistance between K5 Automatic Level Control Module connector terminals listed below and ground.
- Terminal 30
- Terminal 46
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If Infinite resistance
- Test for less than 2 Ω between G4 Automatic Level Control Air Compressor connector terminal 1 and K5 Automatic Level Control Module connector terminal 30.
- If 2 Ω or greater
Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- Test for less than 2 Ω between G4 Automatic Level Control Air Compressor connector terminal 2 and K5 Automatic Level Control Module connector terminal 46.
- If 2 Ω or greater
Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- Test for less than 2 Ω between the G4 Automatic Level Control Air Compressor connector terminal 2 and G3 Air Suspension Compressor connector terminal 1.
- If 2 Ω or greater
Replace the G4 Automatic Level Control Air Compressor
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- 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.