P2052
Reductant Injection Valve Circuit High Bank 2 Unit 1
Auxiliary emissions control
Generic OBD-II
Medium
What it means
P2052 means the engine computer detects high voltage — usually an open or short to power — in the reductant (DEF) injection valve circuit on bank 2, unit 1. This injector meters diesel exhaust fluid into the SCR system to cut NOx. The engine still runs, but an unresolved DEF-dosing fault can trigger reduced power, so it's worth fixing promptly.
Medium
Can I keep driving? Yes for now — the engine runs, but this is a diesel emissions (SCR/DEF) fault that can lead to reduced power if left unfixed; repair soon.
Common symptoms
What you'll notice
- Check-engine light on
- SCR/emissions warning message and possible reduced-power countdown
- Increased NOx / failed emissions readiness
Common causes
Most likely first
- Open or short to power in the reductant injection valve circuit (bank 2, unit 1)Likely
- Faulty reductant (DEF) injectorCommon
- Damaged or corroded wiring or connector at the injectorCommon
- Failed powertrain control module (PCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the reductant injector connector and wiring for damage or a short to power.
- Check the injector control circuit for opens or shorts against the wiring diagram; repair as needed.
- Measure the injector's resistance against spec and replace it if out of range.
- If wiring and injector test good, have the PCM diagnosed. Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P2052?+
Short-term yes, but the SCR system can force reduced power if DEF dosing faults persist, so schedule the repair soon.
Can I just clear P2052?+
It returns until the injector circuit is repaired, and clearing it won't stop an emissions derate.
Related codes
Often seen with P2052
Read & clear P2052 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