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DTC codes / Chrysler codes / P1272

P1272 · ChryslerAccelerator Pedal Position Sensor 2

P1272 on a Chrysler vehicle means the powertrain control module (PCM) has detected an implausible or out-of-range signal from accelerator pedal position sensor 2, the second track of the drive-by-wire pedal assembly. The PCM compares this signal against sensor 1 and the expected voltage window, and it sets the code when the two tracks disagree or sensor 2 falls outside its valid range.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • The electronic throttle control (ETC) warning light or check engine light illuminates on the dashboard.
  • The engine may enter limp-home mode, limiting power and holding engine speed to a low default.
  • The accelerator pedal may feel unresponsive, with delayed or reduced engine response to pedal input.
  • A rough or fluctuating idle can occur as the PCM struggles to reconcile the two pedal signals.
  • Cruise control may be disabled or refuse to engage while the fault is active.
  • Often no symptoms besides the warning light, especially if sensor 1 still provides a usable signal.

Common causes, most likely first

  1. Worn or contaminated accelerator pedal position sensor 2 track inside the pedal assembly.
  2. Corroded, loose, or damaged electrical connector at the accelerator pedal assembly.
  3. Chafed or open wiring in the sensor 2 signal or return circuit between the pedal and the PCM.
  4. Poor ground connection shared by the pedal position sensors, causing a shifted reference voltage.
  5. Failed or failing PCM driver circuit for the sensor 2 input, though this is less common.
  6. Water intrusion or debris in the pedal assembly housing affecting the sensor contacts.

How to diagnose and fix it

  1. Connect a scan tool and read live accelerator pedal position data for both sensor 1 and sensor 2 while slowly pressing the pedal to confirm the fault.
  2. Visually inspect the pedal assembly connector and wiring for corrosion, loose pins, or chafing, and repair as needed.
  3. Back-probe the sensor 2 signal wire at the PCM and at the pedal to check for voltage drops or opens in the circuit.
  4. Verify the sensor ground circuit has less than 0.1 volt drop under load to rule out a bad ground.
  5. If wiring and grounds check out, replace the accelerator pedal assembly with the integrated sensors and clear the code.
  6. After repair, perform a throttle relearn or ETC calibration with the scan tool if the vehicle requires it, then road-test to confirm the code does not return.

Pedal Sensor 2 Faults That Fool Technicians

  • A dirty or worn sensor 2 track often produces an intermittent code that only sets during certain pedal positions, so a static voltage check at rest can pass while the fault is still present.
  • The PCM may set P1272 even when sensor 1 is healthy, because the code is triggered by the correlation between the two tracks rather than a total pedal failure.
  • Corrosion inside the pedal connector is a frequent cause on older Chrysler vehicles, and replacing the pedal without repairing the connector will bring the code back quickly.
  • A weak battery or charging system voltage spike can cause a false P1272 by disturbing the PCM reference voltage, so check battery and charging health before condemning the pedal.
  • After replacing the pedal, some Chrysler models require a relearn procedure; skipping it can leave the vehicle in limp mode and make it appear the repair failed.

Can I keep driving with P1272?

You can usually drive the vehicle to a shop, but expect reduced power and possible limp-home mode, so avoid highway merging, heavy traffic, and towing until the fault is repaired.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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