P254F code meaning
Engine Hood Switch Circuit
Powertrain system Generic code P25xx codes Check engine light
What P254F means
P254F concerns the circuit of the hood switch, which tells the control units whether the engine hood is open. Engines that can start on their own, such as in hybrids or stop/start systems, need this to block an automatic start while someone works under the hood. GM documents the code in the ECM section of its 2012 table 12OBDG06 for the two-mode hybrid Tahoe, Yukon, Escalade, Sierra and Silverado: the engine module reads two hood switch states, checks every 25 ms with run/crank voltage between 11 and 32 V, and sets the fault after 0.5 s as Type B, two trips. GM's later 2017 table 17OBDG04 moved this kind of switch-versus-switch plausibility to P257D, which matches the J2012 range/performance wording. A broken switch or wiring can disable auto-start and raise a warning.
P254F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P254F
- Check engine light after two trips (GM Type B)
- Auto-stop or hybrid engine start disabled
- Hood-open warning while the hood is closed
Common causes of P254F
- Most likelyHood switch dirty, corroded or misadjusted
- PossibleDamaged wiring or connector at the hood latch
- Less likelyBent hood latch after a front-end repair
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hood switchWiring harness
What each part of P254F 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. |
| 4F | The exact fault in that area. |
What to do next
- Note P254F 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 P254F
What does P254F mean?
P254F means "Engine Hood Switch Circuit". P254F concerns the circuit of the hood switch, which tells the control units whether the engine hood is open. It is a generic code, so it means the same on every make.
Is it safe to drive with P254F?
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 P254F fail an emissions test?
Yes, it can. P254F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P254F to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P254F 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.