NOx Sensor Heater Sense Circuit High Input

What it means

P2211 is stored when the engine control module measures a voltage in the NOx Sensor Heater Sense 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 Sense circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed NOx Sensor Heater Sense 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 Sense 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 Sense 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

• P2210NOx Sensor Heater Sense Circuit Low Input
• P2212NOx Sensor Heater Sense Circuit Intermittent
• P2209NOx Sensor Heater Sense Circuit Range/Performance
• P2213NOx Sensor Circuit
• P2208NOx Sensor Heater Sense Circuit
• P2214NOx Sensor Circuit Range/Performance
• P2207NOx Sensor Heater Control Circuit High
• P2215NOx Sensor Circuit Low Input