What does code P25A4 mean?

Q: What does code P25A4 mean?

Fuel Mode Select Switch Circuit. P25A4 indicates that the powertrain control module (PCM) has detected an abnormal condition in the fuel mode select switch circuit, which is used to choose between different fuel maps or fuel types on flexible-fuel or multi-fuel vehicles. The PCM monitors the switch input and sets this code when the signal voltage is outside the expected range for the current operating conditions, indicating an open, short, or implausible switch state.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25A4

P25A4Fuel Mode Select Switch Circuit

P25A4 indicates that the powertrain control module (PCM) has detected an abnormal condition in the fuel mode select switch circuit, which is used to choose between different fuel maps or fuel types on flexible-fuel or multi-fuel vehicles. The PCM monitors the switch input and sets this code when the signal voltage is outside the expected range for the current operating conditions, indicating an open, short, or implausible switch state.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.