Code P0220: Throttle position sensor B/accelerator pedal position sensor / switch B – circuit malfunction

P0220 – Throttle/Pedal Position Sensor/Switch B Circuit

OBD-II code P0220 refers to a throttle position sensor (TPS) circuit malfunction. The throttle position sensor is a crucial component in modern engines, as it communicates the position of the throttle to the engine control module (ECM). This information helps the ECM adjust the air-fuel mixture and ignition timing for optimal engine performance. When the ECM detects a malfunction or irregularity in the TPS circuit, it triggers the P0220 code.

A malfunctioning TPS can lead to various performance issues. Incorrect throttle position readings may cause the engine to run rough, hesitate during acceleration, or stall. In some cases, the vehicle’s electronic throttle control system may go into a reduced power mode to prevent potential safety risks. To diagnose and resolve the issue, it’s essential to inspect the TPS circuit, wiring, and connectors for any damage, corrosion, or loose connections. Replacing a faulty throttle position sensor or repairing the wiring can usually rectify this problem and restore proper engine performance.

Fixes for OBD-II Code P0220

To fix the P0220 OBD-II code you can utilize step-by-step approach:

1. Diagnostic Steps. Using a diagnostic scanner, retrieve the trouble codes stored in the car’s computer. Confirm the presence of code P0220 and note down any additional codes that might be present. They could provide further insight into the issue.
2. Visual Inspection. Inspect the wiring and connectors associated with the TPS. Look for any signs of damage, corrosion, or loose connections.
3. TPS Testing. Use a multimeter to test the TPS for proper functionality. You can measure the voltage output of the TPS as you manually open and close the throttle. Compare the readings to specifications provided in the car’s service manual. Any significant deviations from the specified values can indicate a faulty TPS.
4. Wiring Check. Ensure that the wiring harness leading to the TPS is securely connected and in good condition. Check for breaks, fraying, or pinched wires that could disrupt the electrical signal.
5. Connector Inspection. Examine the TPS connector for any signs of damage, corrosion, or loose pins. A poor connection at the connector can lead to intermittent signal issues.
6. Replace TPS. If the TPS itself is found to be malfunctioning, it’s advisable to replace it. Ensure you use a genuine or high-quality replacement part to maintain accurate throttle position readings.
7. Clear Codes. After addressing the issue, use the diagnostic scanner to clear the trouble codes from the vehicle’s computer.

Note: If you’re not confident in your ability to diagnose and fix the issue yourself, it’s recommended to seek assistance from a qualified mechanic.

Related DTCs to P0220

There are some codes that likely would have been shown along with the aforementioned code: P0120, P0121, P0122, P0123, P0221, P0222, P0223, P0224, P2135.

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