P0626
PowertrainCharging Systemmoderate severityGenerator Field/F Terminal Circuit Low
What P0626 Means
The PCM detected low voltage on the generator (alternator) field control circuit. This can cause charging problems and battery drain.
Symptoms
- Battery warning light on
- Dim headlights
- Battery not charging
Common Causes
- Faulty alternator/generator
- Corroded field terminal connection
- Damaged wiring to field circuit
- Faulty PCM
Diagnostic Steps
- Scan for related charging codes
- Inspect generator field wiring and connectors
- Measure voltage at field terminal
- Test alternator output under load
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0626?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix