Fan 1 Control Module Performance
The fan 1 control module response does not match the calibrated profile. Internal self-tests fail or output drift.
Affected components
- Fan control module 1
- Wiring harness
- Ecm
Common causes
- High likelihood: Internal module fault
- Medium likelihood: Output stage drift
- Low likelihood: Module software outdated, reflash may resolve
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.