P1633Engine computer permanent power supply interrupted
- Ford code · Engine
- Turns on the check-engine light
- How the car detects it
- The engine computer's keep-alive power feed, which stays live with the ignition off to hold learned values, was interrupted. Losing this feed turns on the check-engine light straight away. Learned values such as fuel trims and idle are lost.
- What you may notice
- Check-engine light
- Likely causes
- PossibleOpen or intermittent keep-alive power circuit (fuse, wiring, connector)
- RareBattery terminals loose or corroded
- 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.