P2054: Reductant Injection Valve Circuit Low Bank 1 Unit 2
The P2054 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the reductant injection valve circuit for Bank 1, Unit 2. This valve is part of the selective catalytic reduction (SCR) system, which injects diesel exhaust fluid (DEF) into the exhaust stream to reduce NOx emissions. A low circuit condition typically means the voltage is below the expected range, often due to a short to ground, faulty valve, or wiring issues. This can prevent proper DEF injection, leading to increased emissions and potential performance issues.
01. Most Common Causes
- Faulty reductant injection valve
- Short to ground in the valve circuit wiring
- Open or damaged wiring/connectors
- Corrosion or poor electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased exhaust emissions
- Possible DEF system warning messages
- Vehicle may enter limp mode
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes (e.g., P204F, P2051).
Step 2: Visually inspect the reductant injection valve and its wiring harness for damage, corrosion, or loose connections.
Step 3: Measure the resistance of the injection valve solenoid; compare to manufacturer specs (typically 2-10 ohms).
Step 4: Check for voltage at the valve connector with the ignition on; should be battery voltage (12V). If low, trace circuit for shorts or opens.
Step 5: If wiring and valve are okay, test the PCM output by commanding the valve on/off with a scan tool; if no response, PCM may be faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to reduced performance, increased emissions, and potential damage to the SCR system. The vehicle may enter limp mode, limiting speed and drivability.
How much does it cost to fix?▼
The cost to fix P2054 typically ranges from $150 to $400, including parts and labor. The reductant injection valve itself costs $50-$150, and labor is usually 1-2 hours at $100-$150 per hour.