P0220 – Throttle Position Sensor/Switch B Circuit Malfunction

Understanding the P0220 Diagnostic Trouble Code

The P0220 is a generic powertrain diagnostic trouble code (DTC) that indicates a malfunction with the throttle/pedal position sensor/switch "B" circuit. When this code is triggered, it's important to diagnose and address the issue promptly to avoid drivability problems and potential engine damage.

Urgency and Severity

When the P0220 code is detected, you can usually continue driving the vehicle cautiously for a short distance. However, it's best to have the issue diagnosed as soon as possible. Driving with a faulty throttle/pedal position sensor can lead to poor engine performance, increased emissions, and reduced fuel efficiency. In some cases, the engine may stall or fail to start.

If you experience severe drivability issues, such as significant power loss, rough idling, or stalling, it's recommended to stop driving and have the vehicle towed to a repair shop or dealership.

Code Details

The P0220 code is a generic powertrain code, which means it applies to all makes and models of vehicles manufactured after 1996 that use the OBD-II system. However, the specific troubleshooting steps and repair procedures may vary slightly depending on the vehicle manufacturer.

Parts Involved

The main components associated with the P0220 code are:

1. Throttle Position Sensor (TPS): The TPS is a variable resistor that measures the position of the throttle plate and sends a voltage signal to the engine control module (ECM).

2. Accelerator Pedal Position Sensor (APPS): The APPS detects the position of the accelerator pedal and sends a signal to the ECM to adjust the throttle accordingly.

3. Throttle Body: The throttle body houses the throttle plate and the TPS. It controls the amount of air entering the engine.

4. Wiring Harness and Connectors: The electrical connections between the sensors and the ECM.

Common Causes

Several factors can trigger the P0220 code, including:

1. Faulty TPS or APPS
2. Damaged or corroded wiring harness or connectors
3. Loose or poor electrical connections
4. Contaminated or worn throttle body
5. Misaligned throttle plate or accelerator pedal
6. Malfunctioning ECM (rare)

Diagnosing the P0220 Code

To properly diagnose the P0220 code, follow these steps:

1. Visual Inspection: Check the throttle body, accelerator pedal, and associated wiring for damage, corrosion, or loose connections.

2. Scan for Additional Codes: Use an OBD-II scanner to check for other DTCs that may be related to the throttle system.

3. Test Sensor Voltages: With the ignition on and engine off, use a digital multimeter to measure the voltage at the TPS and APPS connectors. Compare the readings to the manufacturer's specifications.

4. Check Sensor Resistance: Disconnect the TPS and APPS connectors and measure the resistance between the appropriate pins. The resistance should change smoothly as the throttle and accelerator pedal are moved.

5. Inspect ECM: If the sensors and wiring are functioning properly, the ECM may be at fault. This is rare and should be diagnosed by a professional technician.

Solutions and Repair Costs

The most common solutions for the P0220 code include:

• Replacing the faulty TPS or APPS
• Cleaning the throttle body and electrical connectors
• Repairing damaged wiring
• Realigning the throttle plate or accelerator pedal

Approximate repair costs:

• TPS replacement: $100 to $350 USD (€90 to €315 EUR)
• APPS replacement: $100 to $400 USD (€90 to €360 EUR)
• Throttle body cleaning: $50 to $100 USD (€45 to €90 EUR)
• Wiring repair: $50 to $150 USD (€45 to €135 EUR)

Note that these costs may vary depending on the vehicle make, model, and location.

Prevention and Maintenance

To prevent throttle system issues and the P0220 code, follow these tips:

1. Regularly inspect and clean the throttle body to prevent contamination and sticking.
2. Ensure the wiring harness and connectors are secure and free from damage or corrosion.
3. Avoid aggressive driving habits that can strain the throttle system.
4. Address any related issues promptly, such as air intake leaks or malfunctioning sensors.

Related Issues and Fault Codes

Other common issues and fault codes related to the P0220 code include:

• P0121, P0122, P0123: TPS "A" circuit malfunctions
• P0221, P0222, P0223: TPS "B" circuit malfunctions
• P2135: TPS/APPS correlation malfunction
• Rough idling, poor acceleration, reduced fuel efficiency, increased emissions

Frequently Asked Questions About P0220 Code

What does the P0220 code mean?

P0220 indicates a malfunction in the Throttle/Pedal Position Sensor/Switch 'B' Circuit.

Is P0220 a generic or manufacturer-specific code?

P0220 is a generic OBD-II code applicable to all vehicles manufactured since 1996.

What are the common symptoms of a P0220 code?

Common symptoms include poor acceleration, engine stalling, rough idling, and an illuminated check engine light.

Can I continue driving with a P0220 code?

While you may be able to drive short distances, it's not recommended as it can lead to further engine damage and poor performance.

What causes a P0220 code?

Common causes include faulty sensors, damaged wiring, loose connections, or a malfunctioning throttle body.

How serious is the P0220 code?

It's moderately serious as it affects engine performance and drivability, potentially leading to stalling or no-start conditions.

How is the P0220 code diagnosed?

Diagnosis involves visual inspection of wiring and connectors, testing sensor voltages, and using an OBD-II scanner to check for additional codes.

What parts are typically involved in a P0220 code?

The Throttle Position Sensor (TPS), Accelerator Pedal Position Sensor (APPS), wiring harnesses, and the Powertrain Control Module (PCM) are typically involved.

Can a P0220 code clear itself?

While it's possible for the code to clear if the issue resolves temporarily, it's unlikely to stay cleared without proper repairs.

How much does it cost to fix a P0220 code?

Repair costs can range from $100 to $400 USD (€90 to €360 EUR), depending on the specific cause and required parts.

Can a dirty throttle body cause a P0220 code?

Yes, a contaminated throttle body can interfere with sensor readings and trigger the P0220 code.

What's the difference between the TPS and APPS?

The TPS measures the position of the throttle plate, while the APPS detects the position of the accelerator pedal.

Can a bad battery cause a P0220 code?

While unlikely, a weak battery can cause voltage fluctuations that might trigger sensor-related codes like P0220.

How long does it take to fix a P0220 code?

Diagnosis and repair typically take 1-3 hours, depending on the specific cause and vehicle model.

Can I fix a P0220 code myself?

While some causes like loose connections can be fixed by DIYers, professional diagnosis is recommended due to the complexity of modern throttle systems.

Will a P0220 code affect my fuel economy?

Yes, a malfunctioning throttle system can lead to decreased fuel efficiency.

Are there any preventive measures for P0220?

Regular maintenance, including throttle body cleaning and inspection of wiring harnesses, can help prevent P0220 issues.

Can weather conditions trigger a P0220 code?

Extreme temperatures or moisture can affect sensor readings or cause wiring issues, potentially triggering the code.

What other codes are often associated with P0220?

Related codes include P0121, P0122, P0123 (TPS 'A' circuit issues) and P0221, P0222, P0223 (TPS 'B' circuit issues).

Can a software update fix a P0220 code?

In some cases, updating the PCM software can resolve sensor communication issues, but hardware problems will still require physical repairs.