TorqueMech OBD Code Guide
P0485 - Cooling Fan Power/Ground Circuit Malfunction
The ECM detected a power or ground fault in the cooling fan circuit.
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Common Next Steps
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Pressure test cooling system
Confirm external leaks, cap behavior, and pressure loss before parts.
Inspect thermostat
Compare warm-up, scan temperature, and hose temperature behavior.
Verify radiator fan operation
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
Code Overview
The ECM detected a power or ground fault in the cooling fan circuit.
Common Causes
- Failed cooling fan relay or control module
- Fan motor or wiring problem
- Fuse, power, or ground issue
Diagnostic Steps
- Command the fan on if the scan tool supports it
- Check relay, fuse, and fan motor power and ground
- Inspect harness routing and connector condition
Related OBD Codes
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Next Steps
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