Most computer-equipped engines have a throttle position (TP) sensor that relays data to the powertrain control module (PCM). The TP sensor sends a signal to the PCM to determine the amount of throttle opening and the rate of change.
The TP sensor acts as an electronic accelerator pump that lets the PCM pulse additional fuel from the injectors when the throttle is depressed. If the PCM detects that the throttle angle is not appropriate for a specific RPM, a P0221 code will be logged by on-board diagnostics.
Diagnostic trouble code (DTC) P0221 stands for “Throttle/Pedal Position Sensor/ Switch B Circuit Range/Performance Problem.” A “range” or “performance” problem typically means that the sensor in question doesn’t always agree with the other redundant sensors.
A “range” or “performance” problem typically means that the sensor in question doesn’t always agree with the other redundant sensors.
– Richard McCuistian, ASE Certified Master Automobile Technician
The TP sensor works with the PCM to manage the air-fuel ratio and spark timing, as well as other emission components. If the module detects that the throttle angle is not correspondent to a specific RPM, a P0221 code may be set.
Note: The definition of code P0221 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Although a code P0221 is a generic powertrain code and may indicate similar triggers and symptoms, steps for diagnosis and repair may vary from one vehicle to another.
If you’re not familiar with the process of diagnosing trouble codes on your own, it may be best to seek help from a certified mechanic. But if you think you have the right tools and know-how to do the job yourself, then you may go ahead and do it yourself.
To help you out, we’ve gathered a couple of videos that show what the process might involve:
Fixing a P0221 code can be confusing and frustrating. If you’re not confident with your DIY skills yet, it’s a good idea to bring your vehicle to a certified mechanic to ensure that the necessary steps for repair are followed.
But if you think you can get the job done yourself, make sure you have the right tools and information before proceeding. Always refer to your vehicle’s repair manual or check out an online database for vehicle-specific repair information.
A P0221 code triggered by a failed throttle position sensor may cause your vehicle to suffer from poor engine performance. To avoid costly and complex repairs down the road, it’s important to replace worn and damaged parts right away.
With CarParts.com, shopping for a new throttle position sensor is quick and easy. Just visit our website or download our mobile app to start shopping. Use our vehicle selector to check for fitment, and browse products according to your preferred brand or price range using our search filters.
Our catalog is made up of products sourced from the industry’s top parts manufacturers. Parts are manufactured in world-class facilities and undergo rigid testing to ensure they match OE specifications and quality.
Need help checking for fitment or finalizing your order? Our teams are available 24/7 via our toll-free hotline.
Shop and get the best deals today!
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.