Fan 1 Stuck On
Cooling fan 1 stays in the activated state when commanded off. The relay or control driver is welded or stuck on.
Affected components
- Cooling fan 1
- Fan relay 1
- Ecm
Common causes
- High likelihood: Fan relay contacts welded closed
- Medium likelihood: Output driver stuck on
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
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.