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P0229 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


Understanding diagnostic problem codes is essential to diagnosing and repairing vehicle problems. P0229 is one of those codes that can come up. We’ll take an in depth look at P0229 DTC definition, meaning, causes, and efficient fixes from the point of view of this Complete Guide.


  • A problem with the throttle/accelerator pedal position sensor/switch C circuit is indicated by DTC P0229. It’s critical to decrypt this code properly by breaking it down:

  • It’s an issue with the engine or gearbox because “P” stands for powertrain.

  • The universal code “0” can be used with any make or type of car.

  • The number “2” implies a circuit problem.

  • The fault with the throttle/acceleration pedal position sensor/switch C circuit is indicated by the number “2” inside that circuit.

  • The number “9” indicates that the defect has been found more than once.


In order to be able to diagnose effectively, it is essential to understand the possible cause of P0229 DTC. Common causes include:

  •  Faulty Throttle/Accelerator Pedal Position Sensor: A malfunctioning sensor can send incorrect signals to the engine control module (ECM), triggering the code. 
  • Problems with wiring: Electrical signals may be disturbed due to damaged or corroded wire in the sensor circuit.
  • Unstable readings can result from a loose or weak electrical connection between the sensor and the ECM. 
  • Problems with the ECM: the sensor data may not be correctly interpreted by the ECM, causing the code to appear.
  • Pedal Position Sensor Alignment: Sometimes, sensor alignment can be off, causing it to provide inaccurate data.


In order to diagnose and repair the condition as quickly as possible, symptoms associated with P0229 DTC must be detected. Common symptoms include:

  • Reduced engine power: It is likely that the vehicle will lose a significant amount of energy, which can be difficult to accelerate. 
  • Check the Engine Light;CEL illumination: The CEL comes on to alert you that something is wrong.
  • Poor Throttle Response: The throttle may feel unresponsive or jumpy. 
  • Stalling: the engine may stop in serious cases, and you’ll be stuck.


A full diagnosis is needed to identify the exact cause of P0229 DTC. This typically involves:

  • Scanning the ECM for DTCs: Use an OBD-II scanner to retrieve the P0229 code. 
  • Examination of the Throttle Pedal position sensor: Look for signs of damage, misalignment or loose connections.
  • Testing the Sensor’s Voltage: Verify that the sensor is sending the correct voltage signals to the ECM.
  • Checking Wiring and Connections: Inspect the wiring for damage and ensure all connections are secure.
  • ECM Testing: In rare cases, if all other components are in working order, the ECM may need testing or replacement.

Common mistakes

Avoiding common mistakes in the diagnosis and repair process is crucial:

  • Ignoring Other Codes: Sometimes, additional DTCs can mask the root cause of the P0229 code, so all codes should be addressed.
  • Replacing Parts Without Diagnosis: Simply replacing the throttle pedal position sensor without proper testing can lead to wasted time and money.

How serious is this?

There are variations in the seriousness of P0229 DTCs. It is important to remember that the vehicle may continue to operate, but it must not be ignored. The reduced power of the engine may pose a safety risk, particularly when driving under certain conditions.

What repairs can fix the codeS?

repair manuals

Effective repairs for the P0229 DTC include:

  • Replacing the Throttle Pedal Position Sensor: If the sensor is faulty, a replacement is necessary.
  • Repairing or Replacing Wiring: Fixing damaged or corroded wiring and securing connections can resolve the issue.
  • ECM Replacement: In rare cases, a malfunctioning ECM may need replacement.

Related codes

P0228 (Throttle/Pedal Position Sensor/Switch C Circuit Low Input) and P0230 (Fuel Pump Primary Circuit Malfunction) are two further possible related codes. These codes frequently appear alongside P0229 and could have related reasons.


In conclusion, sustaining the performance and safety of your vehicle depends on your ability to comprehend and resolve the P0229 DTC. You may efficiently diagnose and repair this issue, guaranteeing that your car functions smoothly once again, by determining its meaning, causes, symptoms, and suitable remedies. To maintain your car in peak condition, respond quickly if you receive the P0229 error code, whether it is by doing DIY fixes or calling a mechanic.

P0229 Code – What Does It Mean & How To Fix It