Generator Field/F Terminal Circuit Performance
The generator field circuit response does not match command. Field current ramps slowly, drifts or fails to reach commanded values during regulation.
Affected components
- Alternator
- Alternator wiring
Common causes
- High likelihood: Regulator or rotor fault
- Medium likelihood: Field circuit high resistance
Possible symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
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.