What Does P2218 Mean?
The PCM has detected an open circuit or complete lack of continuity in the NOx sensor heater control circuit for Bank 2. The heater is required to bring the NOx sensor to operating temperature for accurate emissions monitoring.
Common Causes
35%
Broken or corroded wiring between PCM and NOx sensor heater
30%
Failed NOx sensor with internal heater element open circuit
20%
Blown fuse or fusible link in NOx sensor heater circuit
10%
Corroded or loose connector at NOx sensor
5%
Failed PCM heater control driver circuit
Diagnostic Steps
1
Step 1: Visually inspect NOx sensor connector and wiring for damage, corrosion, or disconnection
2
Step 2: Check relevant fuses and fusible links in the NOx sensor heater circuit
3
Step 3: Measure resistance across NOx sensor heater element terminals (typically 2-10 ohms when cold)
4
Step 4: Check continuity of wiring from PCM to NOx sensor heater using wiring diagram
5
Step 5: Test PCM heater control output with oscilloscope or multimeter during operation
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or complete lack of continuity in the NOx sensor heater control circuit for Bank 2. The heater is required to bring the NOx sensor to operating temperature for accurate emissions monitoring.
The most common cause of P2218 (NOx Sensor Heater Control Circuit/Open Bank 2) is: Broken or corroded wiring between PCM and NOx sensor heater
Typical repair costs for P2218 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced performance and will fail emissions testing. Extended operation may cause catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2218 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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