P2050
Reductant Injection Valve Circuit/Open Bank 2 Unit 1
Auxiliary emissions (SCR/diesel exhaust fluid)
Generic OBD-II
Medium
What it means
P2050 means the PCM has detected an open in the control circuit for the bank 2, unit 1 reductant injection valve — the injector that doses diesel exhaust fluid into the SCR after-treatment system. It's usually a wiring, connector, or injector fault. The engine still runs, but diesel emissions systems may respond with a power derate if it isn't repaired.
Medium
Can I keep driving? Driveable at first, but the emissions system may trigger a power derate or countdown — repair before it limits performance.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power or a derate warning (on diesels)
- Reductant/DEF system warning message
- Increased NOx / failed emissions
Common causes
Most likely first
- Open circuit in the reductant injector wiring (bank 2, unit 1)Likely
- Faulty reductant injection valveCommon
- Corroded or disconnected injector connectorCommon
- Faulty powertrain control module (PCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the injector wiring and connector for opens, corrosion, or damage.
- Measure the injector's coil resistance against spec; replace the reductant injection valve if it reads open or out of range.
- Repair any broken wiring or poor connections found.
- Consider the PCM only after the injector and its circuit test good.
FAQ
Quick answers
Is it safe to drive with P2050?+
Short-term yes, but diesel emissions systems commonly respond to reductant-dosing faults with a power derate or a limited-restart countdown. Repair it promptly.
Can I just clear P2050?+
It will return until the open circuit or failed injector is fixed. This is a circuit fault, not a temporary glitch.
Related codes
Often seen with P2050
Read & clear P2050 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX