NOx Sensor Heater Control Circuit High

What it means

P2220 is stored when the engine control module measures a voltage in the NOx Sensor Heater Control circuit above the expected maximum, typically because the signal wire is shorted to battery voltage or the circuit is open and pulled up internally.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• Check engine light on
• Rough or unstable idle
• Hesitation or poor acceleration
• Increased fuel consumption
• Possible limp mode with reduced power

Common causes

1. Damaged, chafed or corroded wiring in the NOx Sensor Heater Control circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed NOx Sensor Heater Control component (sensor, solenoid or actuator)
4. Poor ground connection for the module or component
5. Faulty control module driver (rare, confirm all else first)

How to diagnose

1. Read freeze frame data and note when the code set (cold start, under load, after rain)
2. Inspect the NOx Sensor Heater Control connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
3. Measure supply voltage and ground at the connector with the key on
4. Check the signal wire for shorts to ground or battery and for continuity to the control module
5. Test or substitute the NOx Sensor Heater Control only after wiring and connectors are confirmed good
6. Clear the code and complete a drive cycle to confirm the repair

Related codes

Nearby codes in this group

• P2219NOx Sensor Heater Control Circuit Low
• P2221NOx Sensor Heater Sense Circuit
• P2218NOx Sensor Heater Control Circuit/Open
• P2222NOx Sensor Heater Sense Circuit Range/Performance
• P2217NOx Sensor Circuit Intermittent Input
• P2223NOx Sensor Heater Sense Circuit Low
• P2216NOx Sensor Circuit High Input
• P2224NOx Sensor Heater Sense Circuit High