NOx Sensor Circuit High Bank 2
The P2216 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the NOx sensor on Bank 2 that is higher than the expected range. This sensor monitors nitrogen oxide levels in the exhaust to optimize diesel exhaust fluid (DEF) injection and reduce emissions. A high circuit condition typically points to a faulty sensor, wiring issues, or a short circuit.
01. Most Common Causes
- Faulty NOx sensor (Bank 2)
- Short to voltage in sensor wiring or connector
- Corroded or damaged sensor connector
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased emissions
- Possible failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the NOx sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Measure voltage at the sensor signal wire; compare to manufacturer specifications.
Step 4: Test the sensor by swapping with a known good sensor or using a diagnostic tool to monitor readings.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and increased emissions. The vehicle may enter limp mode, limiting speed and drivability.
How much does it cost to fix?▼
The cost typically ranges from $200 to $600, including parts and labor. The NOx sensor itself costs $150-$400, plus diagnostic and installation fees.