P0485
PowertrainCooling Fanmoderate severityCooling Fan Power/Ground Circuit
What P0485 Means
The PCM has detected a fault in the power or ground supply to the cooling fan. Poor power or ground can prevent proper fan operation.
Symptoms
- Fan not running
- Engine overheating
- Intermittent fan operation
Common Causes
- Poor ground connection
- Damaged power wiring
- Corroded connectors
- Faulty fan relay
Diagnostic Steps
- Scan for stored codes
- Check fan power supply voltage
- Inspect and clean ground connections
- Test wiring continuity
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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