Reductant Injection Valve Circuit Open (Bank 1 Unit 2)
The P2053 code indicates an open circuit in the reductant injection valve 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. An open circuit means there is a break in the electrical path, preventing the valve from operating. This can lead to increased emissions and potential derate of engine power.
1. Most Common Causes
- Open or shorted wiring in the reductant injection valve circuit
- Faulty reductant injection valve
- Corroded or damaged connector at the valve
- Blown fuse or relay for the DEF system
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or derate mode
- Increased NOx emissions
- Possible DEF warning light
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P2053 and check for related codes.
Step 2: Visually inspect the wiring and connector for Bank 1 Unit 2 reductant injection valve for damage, corrosion, or loose connections.
Step 3: Measure resistance across the valve solenoid; compare to manufacturer specifications (typically 2-10 ohms).
Step 4: Check for voltage at the valve connector with the ignition on; should be battery voltage on one pin.
Step 5: If wiring and valve are okay, test the circuit continuity from the valve back to the ECM.
4. 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 cause the vehicle to enter derate mode, reducing power and potentially causing further emissions system issues.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether the issue is a simple wiring fix or requires valve replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.