Fix P2220: STEP-BY-STEP diagnostic GUIDE!

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

CodeInformation
MeaningP2220: 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

ActionDescriptionTools Needed
Check for Other CodesUse 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 CircuitUse 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 HeaterUse 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 ConnectorsVisually 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 ContinuityTest 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 ComponentsIf 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 DriveAfter 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 CodesAfter the test drive, re-scan the vehicle to confirm that the P2220 code does not return.OBD-II Scanner
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