P2056
Reductant Injection Valve Circuit/Open
This code indicates reductant injection valve circuit/open (bank 2 unit 2). It relates to the emissions: nox, particulate, dpf, scr and may affect performance, emissions, or drivability depending on the exact failure.
Reductant Injection Valve Circuit/Open (Bank 2 Unit 2)
Common causes
- medium
Sensor failure
O2, NOx, pressure, or temperature sensors can drift or fail.
Typical part cost: $100-400
- medium
Exhaust leak or restriction
Leaks before sensors or a restricted exhaust can set emissions codes.
Typical part cost: $100-400
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2056 mean?
P2056 means "Reductant Injection Valve Circuit/Open (Bank 2 Unit 2)". It is a generic OBD-II code that points to a fault in the emissions: nox, particulate, dpf, scr.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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