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.
Affected components
- Cooling fan
- Cooling fan relay
- Cooling fan module
Common causes
- High likelihood: Fan motor seized or worn
- Medium likelihood: Fan relay defective
- Low likelihood: Wiring or connector fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.