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DTC codes / Chrysler codes / P1270

P1270 · ChryslerAccelerator Pedal Position Sensor A/D Converter Error

P1270 on Chrysler vehicles means the powertrain control module (PCM) detected an internal analog-to-digital (A/D) conversion error while reading the accelerator pedal position sensor signal. The PCM compares the raw sensor voltage against expected values and flags this code when the conversion circuit cannot produce a reliable digital value, which prevents accurate throttle control.

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

Symptoms you may notice

  • Illumination of the check engine light or electronic throttle control (ETC) warning lamp
  • Reduced engine power or limp-home mode with limited throttle response
  • Hesitation or stumble when pressing the accelerator pedal
  • Unstable or surging idle speed
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty accelerator pedal position sensor assembly (internal A/D converter failure)
  2. Worn or corroded electrical connectors at the pedal sensor or PCM
  3. Damaged wiring harness between the pedal sensor and PCM (open, short, or chafed wire)
  4. Poor ground connection for the pedal sensor circuit
  5. Internal PCM fault affecting the A/D conversion circuit
  6. Water intrusion or contamination in the pedal sensor connector

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, and record freeze-frame data to confirm when P1270 sets
  2. Visually inspect the accelerator pedal sensor connector and wiring for corrosion, water, or physical damage
  3. Backprobe the sensor signal and ground wires at the PCM and pedal connector to check for opens or shorts
  4. Measure sensor reference voltage and ground integrity with a digital multimeter (DMM) while wiggling the harness
  5. Perform a live data check of accelerator pedal position percentages to see if the signal drops out or jumps erratically
  6. Replace the accelerator pedal position sensor assembly if wiring and connectors test good
  7. If the sensor and wiring are confirmed good, diagnose the PCM for internal A/D converter failure and replace or reprogram as needed

What Most Techs Miss on P1270

  • A loose or corroded ground at the pedal sensor can mimic an internal A/D converter failure, so always load-test the ground circuit before condemning the sensor.
  • Intermittent P1270 codes often appear only during cold starts or vibration; a wiggle test of the harness while watching live data is more revealing than a static meter check.
  • The accelerator pedal position sensor on many Chrysler vehicles is a dual-track design, and a fault in one track can set P1270 without any driveability complaint.
  • After replacing the pedal sensor, some Chrysler models require a relearn or calibration procedure with a scan tool to clear the code and restore normal throttle response.
  • A weak battery or charging system voltage spike can corrupt the PCM's A/D conversion and set P1270 as a ghost code, so check battery and charging system health first.

Can I keep driving with P1270?

You can usually drive the vehicle to a repair shop, but expect reduced engine power and avoid heavy acceleration or highway merging until the fault is repaired. If the vehicle enters limp-home mode with severely limited speed, pull over and arrange a tow to prevent a dangerous loss of power.

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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