Powertrain
generic / SAE
P0620
Generator Control Circuit
General electrical fault detected in the alternator/generator control circuit. The ECU regulates field excitation on most modern alternators; a fault here causes charging issues and may set additional battery voltage codes.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 20
Possible causes
- Alternator regulator failed high
- Wiring or connector fault medium
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 100–800 €
- Estimated time: 0.5–3.5 h
- Component: alternator
- Component: alternator wiring
- MIL / check engine light
Sources
References
sae:J2012