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 MANUALSGMC2011SAVANA SPECIAL 4.8 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 171 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0480 (LGH)CIRCUIT/SYSTEM TESTING
2011 GMC Savana Special 4.8 A
Circuit/System Testing
2011 GMC Savana Special 4.8 ASECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 GMC Savana and 2011 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the fan clutch solenoid valve jumper harness connector.
- Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal B and ground.
- If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test the fan clutch solenoid and jumper harness for a short to ground.
- Test for 3-4 V between solenoid control circuit terminal A and ground.
- If less than the specified range, test the control circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the relay control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Connect a 3 A fused jumper wire between the solenoid control circuit terminal A and ground. Observe the scan tool Test Status parameters listed below:
- FC Ckt Short Gnd Test Status
- FC Ckt 2 Short Gnd Test Status
Both parameters should transition from OK to Fault when the control circuit is connected to ground.
- If both parameters do not respond as specified, test the solenoid control circuit for a high resistance.
- If only one of the parameters responds as specified, test the appropriate solenoid control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the cooling fan clutch assembly.
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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.