P257F code meaning
Engine Hood Switch Circuit High
Powertrain system Generic code P25xx codes Check engine light
What P257F means
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.
P257F at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P257F
- Check engine lamp on
- Engine stop-start stays inactive
- Hood warning may be shown or may be missing when the hood is really open
Common causes of P257F
- Most likelyOpen hood switch signal wire or unplugged switch
- Most likelyLoose or pushed-back pins in a front harness connector
- Less likelySignal line shorted to a voltage source
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hood switch
What each part of P257F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 7F | The exact fault in that area. |
What to do next
- Note P257F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P257F
What does P257F mean?
P257F means "Engine Hood Switch Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P257F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P257F fail an emissions test?
P257F is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P257F to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P257F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.