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Engine-Codes – Generic – P1126

P1126 Code - Throttle Control Motor Relay Circuit Open

Quick Answer

The P1126 diagnostic trouble code indicates a problem with the throttle control motor relay circuit being open. Common causes include Faulty throttle control motor relay, Damaged wiring or connectors in the throttle control motor relay circuit, Corrosion or loose connections in the electrical system. 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
P1126 indicates Throttle Control Motor Relay Circuit Open.
Common causes
Common causes include Faulty throttle control motor relay, Damaged wiring or connectors in the throttle control motor relay circuit, Corrosion or loose connections in the electrical system.
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 Sep 07, 2024
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Code P1126 Description

The P1126 diagnostic trouble code indicates a problem with the throttle control motor relay circuit being open. This means that there is an interruption in the electrical circuit that controls the throttle control motor, which could result in issues with the vehicle's acceleration and overall performance. The throttle control motor relay is responsible for sending signals from the Engine Control Module (ECM) to the throttle control motor, which regulates the amount of air entering the engine for combustion. When the circuit is open, communication between the ECM and the throttle control motor is disrupted, leading to potential drivability issues.

OBDII Code P1126 - Throttle Control Motor Relay Circuit Open
P1126 Code - Throttle Control Motor Relay Circuit Open

Common Causes of P1126

  1. Faulty throttle control motor relay
  2. Damaged wiring or connectors in the throttle control motor relay circuit
  3. Corrosion or loose connections in the electrical system
  4. Issues with the Engine Control Module (ECM) sending incorrect signals to the throttle control motor relay

Symptoms of P1126

  1. Engine stalling or hesitation during acceleration
  2. Reduced engine power or lack of response when pressing the gas pedal
  3. Illumination of the Check Engine Light
  4. Rough idling or erratic engine performance

How to Fix P1126

  1. Begin by diagnosing the specific cause of the P1126 code using a scan tool to pinpoint the exact issue in the throttle control motor relay circuit.
  2. Inspect the wiring and connectors in the circuit for any damage, corrosion, or loose connections. Repair or replace any faulty components as necessary.
  3. Test the throttle control motor relay to ensure it is functioning properly. Replace the relay if it is found to be defective.
  4. Clear the trouble code from the ECM's memory and perform a test drive to verify that the issue has been resolved.
  5. If the code persists, further diagnosis may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix P1126

The typical repair cost for addressing a P1126 code related to the throttle control motor relay circuit open can vary depending on the specific cause of the issue. In general, replacing a faulty throttle control motor relay or repairing damaged wiring may cost between $100 to $300, including parts and labor. Additional diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour. It is recommended to consult with a professional mechanic to obtain a more accurate estimate based on the vehicle's make and model, as well as the extent of the repairs needed.

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Code P1126 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.

Frequently Asked Questions about P1126 Code

1. What are the common symptoms of OBDII code P1126 (Throttle Control Motor Relay Circuit Open)?

When this code occurs, you may experience issues such as poor engine performance, reduced acceleration, and the vehicle going into a limp mode where it operates at reduced power.

2. What are the possible causes of OBDII code P1126?

The code P1126 typically indicates a problem with the throttle control motor relay circuit being open. Common causes include a faulty throttle control motor relay, damaged wiring or connectors in the circuit, or a malfunctioning throttle control motor.

3. How can I diagnose the cause of OBDII code P1126?

To diagnose the cause of OBDII code P1126, you may need to perform a thorough inspection of the throttle control motor relay, check the wiring and connectors for any damage, and test the throttle control motor for proper functioning using a multimeter.

4. Can I continue driving my vehicle with OBDII code P1126?

It is not recommended to continue driving your vehicle when OBDII code P1126 is present, as it can lead to further damage and potential safety hazards. It is best to address the underlying issue promptly.

5. How can I repair OBDII code P1126?

To repair OBDII code P1126, you may need to replace the faulty throttle control motor relay, repair any damaged wiring or connectors in the circuit, or replace the throttle control motor if it is found to be malfunctioning.

6. Will resetting the OBDII code P1126 clear the issue?

Resetting the OBDII code P1126 may temporarily clear the diagnostic trouble code, but the underlying issue causing the code will still need to be addressed to prevent it from reoccurring.

7. Is it possible to prevent OBDII code P1126 from happening?

While some causes of OBDII code P1126 may be related to wear and tear, regular maintenance checks on the throttle control system and electrical components can help prevent this issue from occurring.

8. Can a DIY enthusiast fix OBDII code P1126?

Depending on your experience and expertise with automotive repairs, a DIY enthusiast may be able to address OBDII code P1126 by following repair guides, using proper diagnostic tools, and ensuring safety precautions are taken.

9. How long does it typically take to repair OBDII code P1126?

The time needed to repair OBDII code P1126 can vary based on the specific cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a day to complete the repair.

10. Should I seek professional help for OBDII code P1126?

If you are unsure about diagnosing or repairing OBDII code P1126, or if the issue persists after attempting DIY repairs, it is advisable to seek professional help from a certified mechanic or automotive technician.

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