P0483
Cooling Fan Rationality Check
The ECM detects that the cooling fan response does not match command. Either the fan rotates without command, fails to rotate when commanded or its current draw is implausible.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Fan motor seized or wornCommon
- Fan relay defectivePossible
- Wiring or connector faultLess likely
Parts involved
- Cooling Fan
- Cooling Fan Relay
- Cooling Fan Module
P0483 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.