P1397Battery voltage out of range during the self-test
- Ford code · Engine
- How the car detects it
- The 12-volt system voltage went too high or too low while a scan-tool self-test (engine off or running) was running. Ford asks for 11 to 18 volts before starting the test; check the battery and charging system.
- What you may notice
- Usually none; set only during a workshop self-test
- Likely causes
- PossibleWeak or discharged battery
- PossibleCharging system fault (low charge or overcharging)
- Sources
Backed by at least two independent sources.
From Obdaryn's Ford pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.