Throttle/Pedal Position Sensor B Circuit Malfunction
Code P0220 indicates a malfunction in the 'B' circuit of the throttle position sensor (TPS) or accelerator pedal position sensor (APP). This sensor is critical for the engine control module (ECM) to determine driver demand and adjust throttle opening. A fault in this circuit can cause incorrect air-fuel mixture, leading to poor performance, stalling, or reduced power. Common causes include a faulty sensor, wiring issues, or a defective throttle body.
1. Most Common Causes
- Faulty throttle position sensor (TPS) 'B' with internal short circuit
- Wiring short to ground or voltage in the 'B' circuit
- Corroded, loose, or poor electrical connections in the sensor harness
- Defective electronic throttle body (ETC)
- Internal engine control module (ECM) failure
- Mechanical issues with the throttle body restricting movement
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Engine stalling or rough idle
3. Step-by-Step Diagnosis
Step 1: Connect an OBD2 scanner and verify code P0220. Check for additional codes.
Step 2: Visually inspect the TPS/APP sensor wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage signal using a multimeter. Compare with manufacturer specifications.
Step 4: If sensor is faulty, replace it. If wiring is damaged, repair or replace as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, reducing power and increasing risk of stalling. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for a sensor replacement, plus labor if done by a shop. DIY replacement is often simple and cheaper.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.