What Does P2224 Mean?
The PCM detects the NOx sensor heater sense circuit voltage for Bank 2 is above the expected threshold. This indicates an open circuit in the sense wire or an internal sensor fault preventing proper temperature monitoring.
Common Causes
35%
Open circuit in heater sense wire between sensor and PCM
30%
Failed NOx sensor with open internal sense circuit
20%
Disconnected or backed-out connector terminal
10%
Damaged wiring harness from heat or abrasion
5%
PCM internal pull-up circuit or input failure
Diagnostic Steps
1
Step 1: Check connector terminals for proper seating and contact pressure at both ends
2
Step 2: Test continuity of sense wire from sensor to PCM with sensor disconnected
3
Step 3: Measure NOx sensor internal sense circuit resistance (typically thermistor with specific resistance curve)
4
Step 4: Inspect wiring harness for breaks, cuts, or heat damage especially near exhaust components
5
Step 5: Verify PCM is providing proper reference voltage on sense circuit when sensor is disconnected
Estimated Repair Cost
$125 - $850
Parts + labor, varies by vehicle and location
The PCM detects the NOx sensor heater sense circuit voltage for Bank 2 is above the expected threshold. This indicates an open circuit in the sense wire or an internal sensor fault preventing proper temperature monitoring.
The most common cause of P2224 (NOx Sensor Heater Sense Circuit High Bank 2) is: Open circuit in heater sense wire between sensor and PCM
Typical repair costs for P2224 range from $125 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but emissions monitoring system is compromised. Should be repaired to prevent potential catalyst damage and ensure compliance with emissions regulations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2224 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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