OBD
P0485
Fan Power/Ground Circuit
What it means
P0485 means Fan Power/Ground Circuit.
Check these first
- An open in the fan power feed
- A bad ground at the fan motor
- A failed fan relay
- Corroded fan power or ground connections
What to do next
- Check the fan power feed for voltage under load
- Measure the voltage drop on the fan ground
- Test the fan relay for proper switching
- Repair or replace the fan ground wire if resistance is high
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.