What Does P2220 Mean?
The PCM has detected voltage or current in the NOx sensor heater control circuit for Bank 2 is above expected specifications. This indicates excessive current or a short to voltage condition.
Common Causes
40%
Wiring shorted to voltage (battery or ignition power)
30%
Failed NOx sensor with internal short in heater element
15%
PCM heater driver circuit stuck high or shorted internally
10%
Pinched or damaged wiring harness causing short circuit
5%
Water intrusion in connector causing short
Diagnostic Steps
1
Step 1: Disconnect NOx sensor connector and check for voltage on heater control wire with ignition on
2
Step 2: Measure resistance from heater control wire to ground and to battery voltage (should be open circuit)
3
Step 3: Inspect wiring harness routing for pinch points, heat damage, or contact with exhaust components
4
Step 4: Measure NOx sensor heater element resistance for signs of internal short (abnormally low resistance)
5
Step 5: Monitor PCM heater control signal with scan tool or oscilloscope for proper PWM operation
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The PCM has detected voltage or current in the NOx sensor heater control circuit for Bank 2 is above expected specifications. This indicates excessive current or a short to voltage condition.
The most common cause of P2220 (NOx Sensor Heater Control Circuit High Bank 2) is: Wiring shorted to voltage (battery or ignition power)
Typical repair costs for P2220 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive but should be repaired promptly to prevent damage to PCM or NOx sensor. Risk of electrical fire if severe short exists.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2220 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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