What does code P25A8 mean?

Q: What does code P25A8 mean?

Fuel Mode Select Switch Circuit Intermittent/Erratic. P25A8 indicates the powertrain control module (PCM) has detected an intermittent or erratic signal from the fuel mode select switch circuit, which is used on some vehicles to choose between different fuel maps or fuel types. The PCM expects a stable voltage or resistance from the switch, but the signal is dropping out or fluctuating beyond acceptable limits, so the computer cannot reliably determine the selected fuel mode.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25A8

P25A8Fuel Mode Select Switch Circuit Intermittent/Erratic

P25A8 indicates the powertrain control module (PCM) has detected an intermittent or erratic signal from the fuel mode select switch circuit, which is used on some vehicles to choose between different fuel maps or fuel types. The PCM expects a stable voltage or resistance from the switch, but the signal is dropping out or fluctuating beyond acceptable limits, so the computer cannot reliably determine the selected fuel mode.

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.