This code indicates that the engine computer has detected an open circuit in the electrical wiring for the reductant injection valve on bank 2 unit 1 of the SCR (Selective Catalytic Reduction) system. An open circuit means the electrical path is broken, preventing the computer from actuating the valve to inject diesel exhaust fluid (DEF) into the exhaust stream.
The internal solenoid of the valve can fail or burn out, creating an open circuit that prevents the valve from operating.
Chafed, broken, or corroded wiring and loose connectors are common causes of open circuits in the SCR system, especially in harsh underbody environments.
A blown fuse in the DEF/SCR system power circuit will cut power to the valve, resulting in an open circuit condition.
A corroded or loose ground connection for the reductant injection valve circuit can cause an open circuit condition.
A failure within the engine control module's internal driver for the reductant valve is possible but extremely rare.
You can drive temporarily, but the vehicle will likely eventually enter a reduced engine power mode (limp mode) to protect the emissions system. It will also fail emissions testing and should be repaired promptly.
No, it rarely does. While an open circuit can theoretically be caused by a failed driver inside the engine computer, the overwhelming majority of P2050 codes are caused by a bad reductant injection valve, damaged wiring, or a blown fuse. Do not replace the PCM without thoroughly ruling out all other components first.
It is an electronically controlled valve, often called a DEF injector, that sprays diesel exhaust fluid into the exhaust stream to chemically reduce nitrogen oxide emissions in the SCR catalyst.
It is typically located in the exhaust pipe just upstream of the SCR catalyst. Bank 2 refers to the side of the engine that does not contain cylinder 1, though on some inline engines, there is only one bank.