What does code P1278 mean?

Q: What does code P1278 mean?

Accelerator Pedal Position Sensor 1 Circuit High Voltage. P1278 on a Chrysler vehicle means the powertrain control module (PCM) has detected a high-voltage condition on the signal circuit from accelerator pedal position sensor 1, which is one half of the redundant pedal assembly. The PCM expects that signal to stay within a calibrated low-voltage range as the pedal moves, and a voltage above the upper limit for a set time triggers this code.

DTC codes / Chrysler codes / P1278

P1278 · ChryslerAccelerator Pedal Position Sensor 1 Circuit High Voltage

P1278 on a Chrysler vehicle means the powertrain control module (PCM) has detected a high-voltage condition on the signal circuit from accelerator pedal position sensor 1, which is one half of the redundant pedal assembly. The PCM expects that signal to stay within a calibrated low-voltage range as the pedal moves, and a voltage above the upper limit for a set time triggers this code.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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