What Does P2206 Mean?
The PCM detects abnormally low voltage or current in the NOx sensor heater control circuit on Bank 1. This indicates excessive resistance or a partial short to ground in the heater circuit.
Common Causes
30%
Partial short to ground in heater circuit wiring
25%
High resistance in NOx sensor heater element
20%
Corroded connector pins causing high resistance
15%
Poor ground connection in sensor circuit
10%
PCM heater driver circuit malfunction
Diagnostic Steps
1
Step 1: Measure NOx sensor heater element resistance and compare to specifications (typically 2-6 ohms)
2
Step 2: Check for voltage drop across heater circuit ground with heater activated
3
Step 3: Inspect all wiring for chafing, pinching, or contact with hot exhaust components
4
Step 4: Monitor heater current draw with amp clamp during operation
5
Step 5: Check for shorted wiring to chassis ground using insulation resistance test
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The PCM detects abnormally low voltage or current in the NOx sensor heater control circuit on Bank 1. This indicates excessive resistance or a partial short to ground in the heater circuit.
The most common cause of P2206 (NOx Sensor Heater Control Circuit Low Bank 1) is: Partial short to ground in heater circuit wiring
Typical repair costs for P2206 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but NOx sensor may not reach proper operating temperature, affecting emissions system performance and potentially causing additional codes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2206 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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