P257D Possible Causes
- Faulty engine hood switch
- Engine hood switch wiring harness is open or short-circuited
- Poor electrical connection in the engine hood switch circuit
How to Fix Code P257D
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Engine light on (or service engine soon warning light)
P257D Meaning
The Powertrain Control Module (PCM) monitors the signal from the engine hood switch circuit. The PCM sets the OBDII code when the engine hood switch signal is outside factory specifications.