Reductant Injection Valve Circuit High Bank 1 Unit 2
The P2055 code indicates that the powertrain control module (PCM) has detected a high 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 high circuit voltage typically means there is a short to power, a faulty valve, or a wiring issue.
01. Most Common Causes
- Short to power in the reductant injection valve circuit
- Faulty reductant injection valve
- Damaged wiring or connectors
- Corroded or loose electrical connections
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased NOx emissions
- Possible DEF system warning messages
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the reductant injection valve resistance with a multimeter; compare to manufacturer specs.
Step 4: Check for voltage at the valve connector with the ignition on; if voltage is present when it shouldn't be, repair short to power.
Step 5: If wiring and valve are okay, test the PCM output or replace the valve.
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, and continued driving could damage the SCR system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the valve or PCM needs replacement.