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 can cause erratic throttle response, reduced power, or limp mode. Common causes include a faulty sensor, wiring issues, or a defective throttle body.
01. Most Common Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor (APP)
- Damaged, corroded, or loose wiring/connectors in the sensor circuit
- Carbon buildup or mechanical failure in the throttle body
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode activated
- Poor acceleration or hesitation
- Erratic idle or stalling
03. 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: Use a multimeter to test sensor voltage and resistance per manufacturer specifications.
Step 4: If sensor tests faulty, replace the throttle position sensor or accelerator pedal sensor as needed.
Step 5: Clear codes and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, but costs vary by vehicle. DIY replacement of the sensor can be under $50.