P2122 Technical Description
Throttle/Pedal Position Sensor/Switch “D” Circuit Low Input
If you’re seeing the P2122 trouble code on your car, this guide will help you understand its meaning, symptoms, causes, and fixes.
I’ve fixed this code many times before.
In this article, you’ll learn what the P2122 code means, common symptoms to look out for, possible causes, and step-by-step fixes to get you back on the road.
Let’s get started.
Key Takeaways
- The P2122 code indicates a low input from the Accelerator Pedal Position (APP) sensor.
- Symptoms include poor throttle response, limp mode, and reduced engine power.
- Causes can be a faulty APP sensor, damaged wiring, or a malfunctioning PCM.
- Diagnose by checking for other codes, inspecting the APP sensor, and testing wiring and connections.
- Fix involves replacing the APP sensor or reprogramming/replacing the PCM if necessary.
- Reset trouble codes and test drive to ensure the issue is resolved.
Table of ContentsShow
What Does P2122 Trouble Code Mean?
The P2122 trouble code indicates a problem with the Accelerator Pedal Position (APP) Sensor.
Specifically, it means that the voltage signal from the APP sensor to the Powertrain Control Module (PCM) is lower than expected.
This sensor is crucial because it tells the PCM how much you’re pressing on the accelerator pedal, which in turn controls the throttle position and engine power.
When the PCM detects a low voltage input from the APP sensor, it triggers the P2122 code.
This could be due to a range of issues such as a faulty APP sensor, wiring problems, or even a malfunctioning PCM.
Essentially, the car’s computer thinks the pedal is not being pressed as it should be, which can lead to poor throttle response or even limp mode, where the car’s speed is limited to prevent damage.
This code is often accompanied by a noticeable reduction in vehicle performance.
You might experience a sluggish response when pressing the gas pedal, or the car might not accelerate at all. In some cases, the Check Engine Light will come on, alerting you to the issue.
The P2122 trouble code is not something to ignore. It affects your car’s drivability and can lead to unsafe driving conditions.
Addressing it promptly ensures that your vehicle runs smoothly and safely.
Fixing this code typically involves checking the APP sensor and related wiring for damage or wear, and replacing any faulty components. In some cases, reprogramming or replacing the PCM might be necessary.
P2122 Trouble Code Symptoms
When your car’s PCM detects the P2122 code, you might notice several symptoms affecting your vehicle’s performance:
- Check Engine Light illuminated
- Poor throttle response
- Vehicle entering limp mode
- Reduced engine power
- Difficulty accelerating
- Unresponsive accelerator pedal
P2122 Trouble Code Causes
Several factors can cause the P2122 trouble code to appear:
- Faulty Accelerator Pedal Position (APP) sensor
- Damaged or frayed wiring in the APP sensor circuit
- Corroded or loose electrical connections
- Malfunctioning Powertrain Control Module (PCM)
- Issues with the throttle body or throttle position sensor (TPS)
How To Fix a P2122 Trouble Code
To fix a P2122 trouble code, follow these steps to diagnose and repair the issue:
1. Check for Other Codes
Start by using an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue.
2. Inspect the APP Sensor
Locate the Accelerator Pedal Position (APP) sensor, usually found near the accelerator pedal. Check for any visible signs of damage, wear, or disconnection.
3. Test the Wiring
Examine the wiring connected to the APP sensor. Look for frayed, damaged, or loose wires. Use a multimeter to check for continuity and ensure there are no breaks in the circuit.
4. Check Electrical Connections
Ensure all electrical connections are clean, secure, and free of corrosion. Loose or corroded connections can cause intermittent signals leading to the P2122 code.
5. Test the Sensor Voltage
Using a multimeter, measure the voltage output of the APP sensor. Compare the readings to the manufacturer’s specifications. A low voltage reading indicates a faulty sensor.
6. Replace the APP Sensor
If the APP sensor is found to be faulty, replace it with a new one. Ensure you use a high-quality replacement part to avoid future issues.
7. Inspect the PCM
If the sensor and wiring are in good condition, the problem might be with the Powertrain Control Module (PCM). Reprogramming or replacing the PCM may be necessary, which typically requires professional assistance.
8. Reset the Trouble Codes
After making the necessary repairs, use an OBD-II scanner to reset the trouble codes. This will clear the P2122 code and turn off the Check Engine Light.
9. Test Drive the Vehicle
Finally, take your car for a test drive to ensure that the issue has been resolved and the P2122 code does not reappear.
Conclusion
Now you know what the P2122 trouble code means and how to fix it yourself.
Have you ever dealt with this issue before?
Comment below with your experience or any questions you have!
