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P1271 Chevrolet Code - Accelerator Pedal Position Sensor 1-2 Correlation

Quick Answer

The P1271 Chevrolet diagnostic trouble code indicates a discrepancy between the readings from Accelerator Pedal Position Sensor 1 and 2 in the vehicle's electronic control module (ECM). Common causes include Faulty Accelerator Pedal Position Sensor 1 or 2, Wiring or connector issues in the sensor circuit, ECM software or hardware malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1271 Chevrolet indicates Accelerator Pedal Position Sensor 1-2 Correlation.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor 1 or 2, Wiring or connector issues in the sensor circuit, ECM software or hardware malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P1271 Chevrolet Description

The P1271 Chevrolet diagnostic trouble code indicates a discrepancy between the readings from Accelerator Pedal Position Sensor 1 and 2 in the vehicle's electronic control module (ECM). This sensor is responsible for detecting the position of the accelerator pedal and relaying this information to the ECM to adjust fuel injection and ignition timing. When there is a correlation issue between the two sensors, it can lead to incorrect fuel delivery, timing adjustments, and overall engine performance.

OBDII Code P1271 Chevrolet - Accelerator Pedal Position Sensor 1-2 Correlation
P1271 Chevrolet Code - Accelerator Pedal Position Sensor 1-2 Correlation

Common Causes of P1271 Chevrolet

  1. Faulty Accelerator Pedal Position Sensor 1 or 2.
  2. Wiring or connector issues in the sensor circuit.
  3. ECM software or hardware malfunction.
  4. Mechanical issues in the accelerator pedal mechanism.
  5. Interference from electromagnetic sources affecting sensor signals.

Symptoms of P1271 Chevrolet

  1. Poor acceleration or hesitation when pressing the gas pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Engine misfires or hesitation during acceleration.
  4. Check Engine Light illuminated on the dashboard.

How to Fix P1271 Chevrolet

  1. Use an OBD-II scanner to confirm the P1271 code and diagnose the specific sensor causing the issue.
  2. Inspect the wiring and connectors for any damage or corrosion, and repair or replace as needed.
  3. Replace the faulty Accelerator Pedal Position Sensor 1 or 2.
  4. Clear the error code from the ECM and perform a test drive to ensure the issue is resolved.
  5. If the problem persists, further diagnostic testing may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix P1271 Chevrolet

The cost of repairing the Accelerator Pedal Position Sensor 1-2 Correlation issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the replacement of the sensor and associated wiring or connectors can range from $150 to $300. Additional diagnostic time and labor costs may apply, with total repair costs potentially reaching $300 to $500. It is recommended to consult with a certified mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

When is the Code Detected?

The Engine Control Module (ECM) compared the signal from both Accelerator Pedal Position (APP) sensors and detected a voltage difference.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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