P2050: Reductant Injection Valve Circuit/Open Bank 2 Unit 1
The P2050 code indicates an open circuit in the reductant injection valve circuit for Bank 2, Unit 1. 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 the electrical path to the valve is broken, preventing the valve from operating. This can lead to increased emissions and potential derate of engine power.
01. Most Common Causes
- Open or shorted wiring in the reductant injection valve circuit
- Faulty reductant injection valve
- Corroded or loose electrical connector
- Blown fuse or relay for the DEF system
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or derate
- Increased NOx emissions
- Possible DEF system warning message on dashboard
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the wiring and connector for Bank 2 Unit 1 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 (12V).
Step 5: If voltage and resistance are normal, replace the reductant injection valve. If not, repair wiring or replace fuse/relay.
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 cause the vehicle to enter a derate mode, reducing power and potentially causing further damage to the SCR system. Additionally, emissions will be higher.
How much does it cost to fix?▼
The cost to fix P2050 typically ranges from $50 to $150 for parts and labor, depending on whether the issue is a simple wiring repair or requires replacement of the injection valve.