NOx Sensor Circuit Low Bank 2
The P2215 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the NOx sensor circuit for Bank 2. 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. This can lead to increased emissions, reduced fuel efficiency, and potential damage to the selective catalytic reduction (SCR) system if left unaddressed.
01. Most Common Causes
- Faulty NOx sensor (Bank 2)
- Short circuit or open in sensor wiring/connector
- Corroded or damaged sensor connector
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and fuel economy
- Increased exhaust emissions
- Possible limp mode activation
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the NOx sensor (Bank 2) wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure voltage at the sensor connector with a multimeter (reference signal and ground).
Step 4: Compare sensor readings with manufacturer specifications; replace sensor if out of range.
Step 5: Clear codes and test drive to verify repair.
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 increased emissions and potential damage to the SCR system. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $200 to $600, including parts (NOx sensor) and labor. Sensor prices vary by vehicle make and model.