The P2220: NOx Sensor Heater Control Circuit High Bank 2 refers to a condition where the voltage in the NOx sensor heater control circuit of bank 2 is higher than expected. This can be caused by a faulty NOx sensor heater, wiring issues, or connector problems, leading to excessive power being supplied to the heater.
P2220 – Quick Overview
Code | Information |
---|---|
Meaning | P2220: NOx Sensor Heater Control Circuit High Bank 2 |
Is it serious? | Yes, high voltage can cause the NOx sensor heater to malfunction, leading to inaccurate NOx readings and affecting emissions control. |
Possible causes | – High voltage in NOx sensor heater control circuit in bank 2 – Faulty NOx sensor heater or wiring issues – Connector problems |
How to diagnose? | – Measure voltage in the NOx sensor heater control circuit in bank 2 – Test the NOx sensor heater for proper operation – Inspect wiring and connectors for faults |
P2220 Meaning
The P2220: NOx Sensor Heater Control Circuit High Bank 2 code indicates that the engine control module (ECM) has detected higher-than-expected voltage in the NOx sensor heater control circuit for bank 2 (the side of the engine that does not contain cylinder 1). The NOx sensor heater is responsible for bringing the sensor up to its operating temperature quickly, allowing accurate NOx readings. High voltage in this circuit can cause the heater to malfunction, potentially damaging the sensor or producing incorrect emissions data.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check for additional related codes that may provide more context for the NOx sensor heater control issue. | OBD-II Scanner |
Measure Voltage in NOx Sensor Heater Control Circuit | Use a multimeter to measure the voltage in the NOx sensor heater control circuit in bank 2. Compare the reading to manufacturer specifications to ensure it is not too high. | Multimeter, Vehicle Manual |
Test the NOx Sensor Heater | Use a diagnostic tool or multimeter to test the NOx sensor heater in bank 2 for proper operation. Ensure it is heating within the recommended voltage range. | Multimeter, Diagnostic Tool |
Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the NOx sensor in bank 2 for signs of corrosion, loose connections, or damaged wires that could cause high voltage. | Flashlight, Safety Gloves |
Test Circuit Continuity | Test the continuity of the NOx sensor heater control circuit. High voltage may result from excessive resistance or wiring issues. | Multimeter, Wiring Diagram |
Repair or Replace Faulty Components | If any faulty wiring, connectors, or NOx sensor heater components are identified, repair or replace them to restore proper operation. | Replacement Parts, Tools |
Clear the Code and Test Drive | After repairs, clear the P2220 code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
Recheck for Codes | After the test drive, re-scan the vehicle to confirm that the P2220 code does not return. | OBD-II Scanner |

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