How to Fix P1126 Throttle Position (TP) Sensor Circuit Intermittent High Voltage

Introduction

If you’re experiencing the P1126 error code on your car, it means that there’s an issue with the throttle position sensor circuit. This can cause a variety of problems, including poor acceleration, stalling, and even engine damage. Fortunately, fixing this issue is relatively straightforward, and you can do it yourself with a few basic tools and some know-how.

Step 1: Diagnose the Problem

Before you can fix the issue, you need to diagnose what’s causing it. Start by checking the throttle position sensor itself. This sensor is usually located on the throttle body and is responsible for telling the engine control module (ECM) how much air is entering the engine. If the sensor is faulty, it can cause the P1126 error code.

To check the sensor, use a multimeter to measure the voltage across the sensor’s terminals. The voltage should increase smoothly as you open the throttle. If the voltage jumps around or doesn’t increase smoothly, the sensor is likely faulty and needs to be replaced.

Step 2: Replace the Throttle Position Sensor

If you’ve determined that the throttle position sensor is faulty, it’s time to replace it. Start by disconnecting the battery to prevent any electrical shocks. Then, locate the sensor on the throttle body and remove it using a wrench or socket set.

Once you’ve removed the old sensor, install the new one in its place. Make sure to tighten the bolts securely and reconnect any electrical connections. Finally, reconnect the battery and start the engine to ensure that the error code has been cleared.

Step 3: Check the Wiring

If replacing the throttle position sensor doesn’t fix the issue, the problem may be with the wiring. Check the wiring harness for any signs of damage or corrosion. If you find any issues, repair or replace the affected wires.

Step 4: Check the ECM

If the wiring is in good condition, the issue may be with the ECM itself. This is a more complex issue that may require professional help. However, before you take your car to a mechanic, try resetting the ECM by disconnecting the battery for a few minutes. This can sometimes clear the error code and fix the issue.

Conclusion

Fixing the P1126 error code is relatively straightforward, and you can do it yourself with a few basic tools and some know-how. Start by diagnosing the problem, replacing the throttle position sensor if necessary, checking the wiring, and resetting the ECM if all else fails. With these steps, you can get your car back on the road and running smoothly.

FAQs

1. Can I drive my car with the P1126 error code?

It’s not recommended to drive your car with the P1126 error code. This issue can cause a variety of problems, including poor acceleration, stalling, and even engine damage. It’s best to fix the issue as soon as possible to avoid any further damage to your car.

2. How much does it cost to fix the P1126 error code?

The cost of fixing the P1126 error code can vary depending on the cause of the issue. If it’s a simple fix like replacing the throttle position sensor, it can cost around $100-$200. However, if the issue is more complex, it can cost upwards of $500 or more.

3. Can I fix the P1126 error code myself?

Yes, you can fix the P1126 error code yourself with a few basic tools and some know-how. However, if you’re not comfortable working on your car or if the issue is more complex, it’s best to take your car to a mechanic.