P1594
Charging System Voltage Too High
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)
Symptoms
- Check engine light is on
- Bulbs and fuses burn out
- Unstable operation of electrical equipment
- Burning smell from battery or generator
- Headlights are too bright
Causes
- Faulty voltage regulator
- Problems with the generator
- Short circuit in charging circuit
- Damaged wiring or poor contacts
- Faulty ECU
How to Fix
- Check the battery voltage with the engine running
- Inspect the wiring and connections of the generator
- Check voltage regulator
- Test the generator on the stand
- If necessary, replace the generator or voltage regulator