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DTC codes / Chrysler codes / P1125

P1125 · ChryslerAccelerator Pedal Position (APP) System

P1125 on Chrysler vehicles indicates that the Powertrain Control Module (PCM) has detected a fault within the Accelerator Pedal Position (APP) system, which translates the driver's pedal input into an electrical signal for throttle control. The computer monitors two or more APP sensor circuits for plausible and correlating voltages, and this code sets when the signals fall outside expected ranges or disagree with each other.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • The electronic throttle control (ETC) warning light or check engine light illuminates on the dashboard.
  • The engine may enter limp mode, limiting speed to a low threshold such as idle or 1,500 RPM.
  • The accelerator pedal may feel unresponsive or require excessive travel to accelerate.
  • Intermittent loss of power or surging may occur as the APP signal fluctuates.
  • Often no symptoms besides the warning light, especially if the fault is stored but not currently active.

Common causes, most likely first

  1. Faulty accelerator pedal position sensor assembly, including worn internal potentiometers or hall-effect sensors.
  2. Corroded, loose, or damaged electrical connectors at the APP sensor or PCM.
  3. Wiring harness damage such as chafed wires, open circuits, or shorts to ground or voltage in the APP signal circuits.
  4. PCM internal fault or software issue misinterpreting APP signals.
  5. Poor ground connection for the APP sensor or PCM, causing reference voltage instability.
  6. Aftermarket electronic throttle controllers or pedal modifiers interfering with APP signals.

How to diagnose and fix it

  1. Inspect the APP sensor connector and wiring for corrosion, loose pins, or physical damage, and clean or repair as needed.
  2. Check for technical service bulletins (TSBs) or software updates for the PCM related to APP system faults.
  3. Use a scan tool to view live APP sensor voltage data from each circuit and compare readings through the full pedal travel to identify dead spots or irrational values.
  4. Perform a voltage drop test on the APP sensor ground and reference circuits to rule out high resistance.
  5. If live data confirms erratic or non-correlating APP signals, replace the accelerator pedal assembly with a quality OEM part.
  6. After repair, clear the codes and perform a throttle relearn or idle relearn procedure as required by the vehicle.
  7. Verify the repair by test-driving and confirming no pending or stored codes return.

APP Sensor Diagnostics Before Replacement

  • A common misdiagnosis is replacing the APP sensor when the real problem is a chafed wire in the harness near the pedal or under the dash, so always perform a wiggle test while watching live data.
  • The PCM compares two APP sensor signals that should mirror each other; a single erratic signal often points to a poor connection rather than a failed pedal assembly.
  • Aftermarket floor mats or debris can physically obstruct the pedal and cause intermittent APP codes, so check for interference before condemning electrical parts.
  • Low battery voltage or a weak charging system can cause the PCM to set APP codes due to unstable reference voltage, so verify battery and charging system health first.
  • Some Chrysler vehicles require a relearn procedure after APP sensor replacement, and skipping it can leave the vehicle in limp mode even with a good part.

Can I keep driving with P1125?

If the vehicle is in limp mode or the pedal response is unpredictable, avoid driving until diagnosed because sudden loss of power can be dangerous. If the light is on but the car drives normally, you may drive cautiously to a repair shop, but do not ignore the warning.

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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