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Engine-Codes – Generic – P1231

P1231 Code - Throttle Position Sensor 1 and 2 Circuit

Quick Answer

The P1231 diagnostic trouble code (DTC) indicates a problem with the Throttle Position Sensor (TPS) 1 and 2 circuit. Common causes include Faulty TPS sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS sensor. 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
P1231 indicates Throttle Position Sensor 1 and 2 Circuit.
Common causes
Common causes include Faulty TPS sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS sensor.
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 P1231 Description

The P1231 diagnostic trouble code (DTC) indicates a problem with the Throttle Position Sensor (TPS) 1 and 2 circuit. The TPS is a crucial component of the engine management system, providing feedback to the engine control module (ECM) about the position of the throttle valve. This information is used to adjust fuel delivery and ignition timing to optimize engine performance and efficiency. When the ECM detects an issue with the TPS circuit, it can lead to poor engine performance, reduced fuel economy, and potential drivability issues.

OBDII Code P1231 - Throttle Position Sensor 1 and 2 Circuit
P1231 Code - Throttle Position Sensor 1 and 2 Circuit

Common Causes of P1231

  1. Faulty TPS sensor.
  2. Damaged wiring or connectors in the TPS circuit.
  3. Corrosion or contamination in the TPS sensor.
  4. ECM software or hardware issues.
  5. Mechanical issues with the throttle body.

Symptoms of P1231

  1. Rough idling or stalling.
  2. Lack of throttle response or hesitation during acceleration.
  3. Engine surging or fluctuating idle speed.
  4. Check Engine Light illuminated on the dashboard.
  5. Reduced fuel efficiency.

How to Fix P1231

  1. Begin by conducting a thorough inspection of the TPS sensor, wiring, and connectors for any signs of damage or corrosion.
  2. Test the TPS sensor using a multimeter to check for proper voltage output at different throttle positions.
  3. Replace the TPS sensor if it fails the voltage test or shows signs of malfunction.
  4. Clear the DTC from the ECM memory using a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be needed to identify any underlying issues with the throttle body or ECM.

Cost to Fix P1231

The cost of repairing a Throttle Position Sensor circuit issue can vary depending on the extent of the problem and the specific components that need to be replaced. In general, replacing a faulty TPS sensor can range from $50 to $200, while labor costs can add another $50 to $100. Overall, the total repair cost for this issue may fall between $100 and $300, but it's essential to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model. Additionally, labor rates and diagnostic fees can influence the final cost, so it's advisable to inquire about these factors before proceeding with the repair.

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Code P1231 Information for Specific Makes

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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