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Summary
  • The P0229 code stands for “Throttle/Pedal Position Sensor Switch “C” Circuit Intermittent.” It’s triggered when the code detects a problem with the sensor or the sensor’s circuit.
  • Some common causes for the code include a failing accelerator pedal position assembly, a damaged throttle plate, and PCM failure.
  • Symptoms to look out for include an illuminated check engine light, poor engine performance, and a vehicle entering limp mode.

The throttle position sensor (TPS) measures how far open the throttle valve is opened by the throttle pedal. Meanwhile, the accelerator pedal position sensor (APP) measures the position of the accelerator pedal.  This information corresponds to how much the driver wants to accelerate. The TPS sends this information to the powertrain control module (PCM), where the information is used to help calculate the ideal values for several engine variables. When your vehicle’s throttle position sensor or accelerator pedal position sensor develops an issue, it can trigger the P0229 code or other related trouble codes.

See also  P0123 Code: Throttle / Pedal Position Sensor "A" Circuit High

What Does the P0229 Code Mean?

The P0229 code is defined as Throttle/Pedal Position Sensor Switch “C” Circuit Intermittent. The PCM triggers this code when it detects a problem with the sensor or the sensor’s circuit.

tps and app sensors image
When your vehicle’s TPS or APP develops an issue, it can trigger the P0229 code.

Without information from the TPS and APP, the PCM won’t be able to accurately manage the electronic throttle body. Problems with the TPS or APP can result in the engine running much less efficiently. The PCM might also trigger limp mode, which will prevent the vehicle from running at speeds exceeding 20 miles per hour to protect the engine and driver.

Note: The definition of the P0229 code can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0229 Code?

These are the most common issues related to the P0229 code:

  • Accelerator pedal position assembly failure
  • Damaged throttle plate
  • PCM failure or software in need of an update
  • TPS failure
  • Faulty wiring

What are the Common Symptoms of the P0229 Code?

Your vehicle might exhibit the following symptoms when the P0229 code is stored:

image of an automotive throttle body with its plate
A damaged throttle plate can result in logged P0299 code.

How to Diagnose the P0229 Code

Even though the P0229 code’s definition indicates that the TPS or APP have problems, you still need to properly diagnose the issue before performing any kind of repairs. There are several components that might cause the issue aside from the TPS or APP, such as the wiring and the PCM.

See also  P2135 Code: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Keep in mind that vehicle designs and their respective repair procedures vary depending on the manufacturer. Diagnosing the concerned components might require special knowledge and tools.

If you aren’t familiar with vehicle repair, take your car to a mechanic for a proper diagnosis. Otherwise, you can consult online video resources to learn more about the code.

How to Fix the P0229 Code

Before attempting to do any repairs, know that the repair processes for OBD-II trouble codes can vary greatly. There isn’t a magic-bullet fix for them because different vehicle models are designed differently. If you don’t have much experience troubleshooting DTCs, then we recommend leaving the task to a professional mechanic.

You can try to do the job yourself, but you need to make sure to know the vehicle-specific repair procedures before you get started. Luckily, this information is available online. Chilton repair manuals or a subscription to an online repair database like ALLDATA DIY can give you information on the correct diagnostic and repair procedure to clear diagnostic trouble codes like the P0229 code.

See also  P0306 Code: Cylinder 6 Misfire Detected

Shopping for Replacement Parts to Clear a P0229 Code

This code is typically logged when parts like the throttle plate and the accelerator pedal position sensor fail. It’s important to inspect these parts and replace them as needed.

Fortunately, finding replacement parts designed to work with your vehicle is easy with the help of CarParts.com. Shop for the parts you need online, and get them delivered straight to your doorstep in a matter of days.

Simply download our mobile app or visit our website to get started. Enter your vehicle’s exact year, make, model, and engine to check for fitment. You can even filter our catalog according to your preferred brands or price range.

We make it a point to source our auto parts from some of the most trusted manufacturers in the industry. Each item in our catalog is handpicked by professionals to guarantee quality and durability.

Shop now, and get replacement parts that are built to last!

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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