P2220 Fault Code

NOx Sensor Heater Control Circuit High Bank 2

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2220 fault code indicates a problem with the NOx sensor heater control circuit on Bank 2 of your vehicle's engine. This sensor plays a critical role in monitoring the levels of nitrogen oxides in the exhaust gases, which is essential for meeting emissions standards. When there is an issue with the heater control circuit, the sensor may not function properly, leading to increased emissions and potential engine performance issues. It's important to address this code promptly to maintain optimal vehicle performance.

What are the symptoms of the P2220 code?

Common symptoms associated with the P2220 fault code include:

• Illuminated check engine light.
• Decreased engine performance or acceleration.
• Increased emissions, potentially leading to failed emissions inspections.
• Unusual engine noises or running irregularities.

What causes the P2220 code?

Several factors can lead to the P2220 code being triggered, including:

• Faulty NOx sensor.
• Poor electrical connections or damaged wiring in the heater control circuit.
• A blown fuse related to the NOx sensor heater.
• Issues with the Engine Control Unit (ECU) that may prevent proper sensor operation.

How to fix P2220?

To resolve the P2220 fault code, follow these steps:

• Use a diagnostic scanner to confirm the fault code and check for any additional codes.
• Inspect the wiring and connectors related to the NOx sensor heater circuit for damage or corrosion.
• Test the NOx sensor to determine if it is functioning properly and replace it if necessary.
• Replace any blown fuses associated with the sensor.
• Clear the fault code and conduct a test drive to ensure the issue is resolved.