Fault Family System: Powertrain (P-Codes) 5 SAE Codes

Engine Hood Switch Circuit

Diagnostic & Technical Explanation

Code P254F (Engine Hood Switch Circuit) sets when the ECM/BCM sees an open, shorted, or implausible signal from the switch that detects whether the hood is open or closed, used on some platforms to inhibit remote start or PTO operation for safety, or the module detects the hood is genuinely open when it should be closed. Causes are a misadjusted or corroded hood switch, water intrusion at its under-hood mounting location, or chafed wiring in the engine-bay harness.

These 5 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P254F	Engine Hood Switch Circuit	3 ranked fixes
P257D	Engine Hood Switch Circuit Range/Performance	3 ranked fixes
P257E	Engine Hood Switch Circuit Low	3 ranked fixes
P257F	Engine Hood Switch Circuit High	3 ranked fixes
P25A3	Engine Hood Open	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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