What Does P2223 Mean?
The PCM detects the NOx sensor heater sense circuit voltage for Bank 2 is below the expected threshold. This indicates the sense signal is reading too low, preventing proper heater temperature monitoring.
Common Causes
35%
Shorted heater sense wire to ground
30%
Failed NOx sensor with internal short in sense circuit
15%
Poor ground connection causing voltage reference issues
12%
Damaged connector with terminals touching or corroded
8%
PCM internal sense circuit failure
Diagnostic Steps
1
Step 1: Disconnect NOx sensor and measure sense circuit voltage at PCM connector (should see reference voltage)
2
Step 2: Check sense wire for shorts to ground using ohmmeter with sensor disconnected
3
Step 3: Inspect sensor connector for corrosion, moisture, or terminal damage
4
Step 4: Verify proper ground connections throughout the NOx sensor circuit
5
Step 5: Measure NOx sensor internal sense circuit resistance and compare to specifications
Estimated Repair Cost
$125 - $800
Parts + labor, varies by vehicle and location
The PCM detects the NOx sensor heater sense circuit voltage for Bank 2 is below the expected threshold. This indicates the sense signal is reading too low, preventing proper heater temperature monitoring.
The most common cause of P2223 (NOx Sensor Heater Sense Circuit Low Bank 2) is: Shorted heater sense wire to ground
Typical repair costs for P2223 range from $125 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No immediate safety concern but vehicle should be repaired to maintain proper emissions control. May result in failed emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2223 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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