P2218 Fault Code

NOx Sensor Heater Control Circuit/Open Bank 2

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

The P2218 fault code indicates a problem with the NOx sensor heater control circuit for Bank 2. This sensor is crucial for monitoring nitrogen oxide emissions in the exhaust system. When the sensor malfunctions or its circuit is open, it can lead to incorrect readings, affecting engine performance and emissions control.

What are the symptoms of the P2218 code?

Symptoms associated with the P2218 code may include:

• Illumination of the check engine light
• Increased nitrogen oxide emissions
• Reduced engine performance and efficiency
• Possible erratic behavior of the engine due to incorrect air-fuel mixture adjustments by the ECM.

What causes the P2218 code?

Common causes of the P2218 code include:

• A faulty NOx sensor or its heater element
• Wiring issues such as damaged or corroded connectors and harnesses
• A blown fuse that affects the sensor's power supply
• Problems with the engine control module (ECM) that could lead to incorrect signals being sent.

How to fix P2218?

To resolve the P2218 code, follow these steps:

• Inspect the NOx sensor and its wiring for any visible damage or wear. Repair or replace as necessary.
• Check fuses and ensure that power is being supplied to the NOx sensor. Replace any blown fuses.
• Clear the fault code and test drive the vehicle to see if the code returns. If it does, further diagnosis may be required, possibly looking into the ECM for faults.