NOx Sensor Circuit Low Bank 2
The P2215 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the NOx sensor circuit for Bank 2 (the side of the engine not containing cylinder #1). This sensor monitors nitrogen oxide levels in the exhaust to optimize diesel exhaust fluid (DEF) injection and reduce emissions. A low circuit voltage typically points to a faulty sensor, wiring issues, or a short circuit.
1. Most Common Causes
- Faulty or worn NOx sensor
- Damaged, corroded, or loose sensor wiring
- Short to ground in the sensor circuit wiring
- Sensor connector contaminated with moisture or dirt
- Engine control module (ECM) failure (uncommon)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Failed emissions test
- Possible limp mode or reduced engine power
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P2215 and check for additional codes.
Step 2: Visually inspect the NOx sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Measure voltage at the sensor connector with the ignition on; compare to manufacturer specs (typically 5V reference).
Step 4: If voltage is low, disconnect the sensor and check for a short to ground in the harness.
Step 5: If wiring is intact, replace the NOx sensor (Bank 2).
Step 6: Clear codes and test drive to confirm repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but continued driving may cause reduced performance, increased emissions, and potential damage to the DEF system. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Replacing a NOx sensor typically costs $200-$600 including parts and labor, depending on vehicle make and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.