The P0221 OBD-II code indicates a performance issue in the Throttle/Pedal Position Sensor “B” circuit. This sensor plays a key role in monitoring how much throttle is applied, which helps the engine control module (ECM) deliver the right fuel-air mixture. When this sensor doesn’t send consistent or expected signals, the vehicle may enter limp mode, lose power, or trigger a check engine light.
Common Symptoms of P0221
- Check Engine Light is ON
- Poor throttle response or hesitation
- Limp mode activation
- Unstable idle or stalling
- Reduced fuel efficiency
Possible Causes
- Faulty throttle position sensor (TPS)
- Worn or damaged pedal position sensor
- Corroded or loose wiring connections
- ECM receiving incorrect voltage signals
- Previous repairs causing misalignment
Real-World Example
A 2015 Chevy Malibu owner reported sudden loss of power on the highway. The car went into limp mode and threw codes P0221 and P0220. After scanning with the iCarsoft CR MAX BT, the issue was traced to a worn pedal position sensor connector. Replacing the connector and clearing codes restored full performance.
How to Diagnose and Fix P0221
- Scan the vehicle with a professional tool like iCarsoft CR MAX BT
- Check live throttle and pedal position sensor data
- Inspect wiring harnesses for damage or corrosion
- Test sensor voltages with a multimeter
- Replace faulty TPS or pedal sensor if readings are inconsistent
- Clear codes and test drive the vehicle
Related Codes
Often, P0220 and P0216 may appear alongside P0221. It’s important to diagnose all related codes to avoid misdiagnosis.
Frequently Asked Questions (FAQ)
Can I drive with code P0221?
It’s not recommended. The vehicle may enter limp mode or stall unexpectedly, creating a safety risk.
Is P0221 the same as a bad accelerator pedal?
Not always. While a failing pedal sensor can trigger P0221, wiring or TPS issues may also be responsible.
How much does it cost to fix P0221?
Repair costs vary: a new TPS typically ranges from $80–$250 plus labor. Using a DIY tool like the CR MAX BT can save diagnostic costs.
Which vehicles are most affected by P0221?
This code is common in Chevy, Ford, Toyota, and Volkswagen vehicles with electronic throttle control systems.
Best Tool to Diagnose P0221
The iCarsoft CR MAX BT is designed for both professionals and DIYers. With its ability to read live throttle and pedal data, it makes diagnosing P0221 and related codes straightforward.
Additional Resources
Summary: P0221 indicates a throttle/pedal position sensor issue. With proper diagnostics using the iCarsoft CR MAX BT, most repairs are quick and effective.
