P257FEngine Hood Switch Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P257F is the high-side counterpart of P257E: the hood switch reading rises above the top limit, which points to an open signal line, a pin that has backed out of its connector, or a short to a voltage source. In GM's 2018 engine table 18OBDG04 the limit for a resistance-coded switch is 3,620 ohms or more, and the 2019 hybrid table 19OBDG01 uses 71.5 % of range; both need 80 failures within 100 samples and are Type B with two trips. A Stellantis STAR case for 2021–2023 Wrangler models sends technicians to connector XY103A at the left front of the engine compartment, where loose terminals can set P257F together with P152E or P0073. GM's PIE0834 also names it on its electric trucks with latch faults. The driver sees a check engine lamp, possibly a hood warning, and no automatic engine stop.
- What you may notice
- Check engine lamp on
- Engine stop-start stays inactive
- Hood warning may be shown or may be missing when the hood is really open
- Likely causes
- LikelyOpen hood switch signal wire or unplugged switch
- LikelyLoose or pushed-back pins in a front harness connector
- RareSignal line shorted to a voltage source
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.