OBD-II code P2053 indicates that the engine control module has detected an open circuit in the reductant injection valve for Bank 1 Unit 2. This means the electrical path to the diesel exhaust fluid (DEF) injector is incomplete, preventing the selective catalytic reduction (SCR) system from injecting DEF to reduce nitrogen oxide emissions.
The DEF injector itself can fail internally, causing an open circuit that prevents operation and triggers the code.
Corroded, chafed, or broken wires in the reductant injection valve circuit can create an open electrical condition.
Corrosion or loose pins in the injector connector can interrupt the electrical signal to the valve.
A blown fuse in the DEF system power circuit can cut power to the injection valve, resulting in an open circuit code.
An internal failure in the control module driver circuit is extremely rare but could theoretically cause this code.
It is not recommended. The vehicle may enter a reduced power mode to protect the emissions system, and driving without proper DEF injection can result in a no-start condition after repeated attempts.
No, replacing the PCM/ECM is almost never the correct fix for this code. Drivers are frequently misdiagnosed with a bad module, but the cause is overwhelmingly a failed reductant injection valve, wiring issue, or poor connection. Control module failure is exceptionally rare for this code.
Yes, the reductant injection valve is the component that sprays diesel exhaust fluid (DEF) into the exhaust stream. It is commonly referred to as the DEF injector.
No, a DEF tank heater issue will typically set a specific code related to the heater circuit. P2053 specifically points to an open circuit in the Bank 1 Unit 2 injection valve itself.