What Does P2219 Mean?
The PCM detects voltage or current in the NOx sensor heater control circuit for Bank 2 is below expected specifications. This indicates insufficient power is reaching the heater element.
Common Causes
35%
High resistance in wiring or corroded connections reducing current flow
25%
Partially failed NOx sensor with degraded heater element
20%
Low voltage supply from battery or charging system issues
15%
Poor ground connection for NOx sensor heater circuit
5%
Weak PCM heater driver output
Diagnostic Steps
1
Step 1: Check battery voltage and charging system output (should be 13.5-14.5V running)
2
Step 2: Measure voltage at NOx sensor heater connector with heater commanded on
3
Step 3: Check all ground connections for NOx sensor circuit, clean and tighten as needed
4
Step 4: Measure heater element resistance and compare to specifications
5
Step 5: Check voltage drop across heater circuit wiring while heater is active
Estimated Repair Cost
$100 - $750
Parts + labor, varies by vehicle and location
The PCM detects voltage or current in the NOx sensor heater control circuit for Bank 2 is below expected specifications. This indicates insufficient power is reaching the heater element.
The most common cause of P2219 (NOx Sensor Heater Control Circuit Low Bank 2) is: High resistance in wiring or corroded connections reducing current flow
Typical repair costs for P2219 range from $100 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but emissions system effectiveness is compromised. May result in failed emissions test and potential long-term catalyst damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2219 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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