P2138 CODE? EASY FIX Throttle Pedal Position Sensor Limp Mode (Chevy Sonic Cruze Etc) #repair #diy

Summary

In this video, the creator addresses a P2138 error code on a Chevy Sonic, explaining how it leads to limp mode due to an issue with the electronic throttle sensor. The video walks through troubleshooting steps, including checking wiring connections at the throttle body and mass airflow sensor. It also suggests looking for potential water leakage in the driver’s side kick panel that could cause corrosion. Ultimately, the issue is diagnosed as a faulty gas pedal sensor, which is easily replaced. The creator advises checking the wiring first and replacing the gas pedal as the most affordable solution before considering more costly repairs.

Takeaways

• 😀 The P2138 code indicates an issue with the throttle position sensor or electronic control module in the Chevy Sonic.
• 😀 The vehicle may enter limp mode, which is characterized by an engine light and a downward arrow symbol.
• 😀 The problem is related to the gas pedal and throttle body, where the electronic sensor may not register pedal input correctly.
• 😀 The first step in diagnosing the issue is to inspect the throttle body and its connections, including the mass airflow sensor.
• 😀 Water leaks into the kick panel can cause wiring issues and corrosion, so it’s important to check for any moisture in the vehicle’s interior.
• 😀 If no moisture or corrosion is found in the wiring, the next step is to consider replacing the gas pedal, which contains the electronic position sensor.
• 😀 Replacing the gas pedal is a relatively simple process involving one bolt and a single electrical connection.
• 😀 After replacing the gas pedal, the system codes need to be cleared to check if the issue is resolved.
• 😀 If the problem persists and the code reappears, further investigation into the throttle body or the electronic control module may be necessary.
• 😀 The gas pedal replacement is the most cost-effective option, so it should be the first part to check and replace before looking at more expensive components like the throttle body or ECM.
• 😀 The video emphasizes checking wiring connections, including at the throttle body and mass airflow sensor, as a key troubleshooting step before replacing components.

Q & A

What does the P2138 code indicate in a Chevy Sonic?

The P2138 code indicates that the ECM (Electronic Control Module) has detected an issue with the throttle position sensor. This means there's a problem with the sensor's ability to communicate the throttle position between the gas pedal and the throttle body.

What happens when the Chevy Sonic goes into limp mode?

When the Chevy Sonic goes into limp mode, it’s a safety measure triggered by the vehicle's system to prevent further damage. The check engine light and an arrow pointing down appear, signaling an issue with the vehicle's performance, often related to the throttle sensor or control system.

How can I check the throttle body and its connections?

To check the throttle body, first remove the airbox to access it. Inspect all the connections to ensure there are no loose wires, corrosion, or bad connections. If needed, refer to a video on the channel for a step-by-step guide on cleaning the throttle body.

What role does the electronic gas pedal play in this issue?

The electronic gas pedal has a sensor that communicates with the ECM to indicate the position of the gas pedal. If the sensor fails, it can cause issues like the P2138 code, leading to the vehicle going into limp mode.

What should I check if I suspect a water leak is causing the issue?

Check the driver's side kick panel area for any signs of water leakage. Water could cause corrosion in the wiring and connections. If the floorboard has been wet or there’s a leaking windshield, addressing the water leak is the first step before continuing with other repairs.

How do I replace the gas pedal in a Chevy Sonic?

To replace the gas pedal, first remove the 10mm bolt securing the pedal, then disconnect the wiring. Afterward, install the new pedal by securing it with the bolt and plugging the wiring back in.

Is replacing the gas pedal a difficult task?

No, replacing the gas pedal is relatively simple. It only requires removing a single bolt and disconnecting the wiring. The new pedal just clicks into place and is secured with a bolt.

What should I do if replacing the gas pedal doesn’t fix the issue?

If replacing the gas pedal doesn’t fix the issue and the P2138 code returns, the next step would be to check the throttle body. It might be necessary to clean or replace the throttle body if it's malfunctioning.

Why is it recommended to check the wiring and throttle body first before replacing the gas pedal?

It’s recommended to check the wiring and throttle body first because these are common culprits for the issue. By ruling out easy fixes like loose or corroded wiring, you can avoid unnecessary parts replacements and focus on the more expensive components only if necessary.

What vehicles other than the Chevy Sonic might have the P2138 code?

The P2138 code can apply to several other vehicles, such as the Chevy Cruze and similar models. The diagnostic procedure and steps for troubleshooting can often be applied across different vehicles with similar throttle control systems.