OBD-II code · Powertrain (generic, extended)
P2056 Reductant Injection Valve Circuit/Open (Bank 2 Unit 2)
Reductant Injection Valve Circuit/Open (Bank 2 Unit 2): the circuit is open. This valve doses reductant (DEF/AdBlue) into the exhaust for SCR NOx reduction.
Is it safe to drive with P2056?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySolenoid winding open
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Injection Valve
Related codes
- P2047Reductant Injection Valve Circuit/Open (Bank 1 Unit 1)
- P2050Reductant Injection Valve Circuit/Open (Bank 2 Unit 1)
- P2053Reductant Injection Valve Circuit/Open (Bank 1 Unit 2)
- P2054Reductant Injection Valve Circuit Low (Bank 1 Unit 2)
- P2055Reductant Injection Valve Circuit High (Bank 1 Unit 2)
- P2057Reductant Injection Valve Circuit Low (Bank 2 Unit 2)
- P2058Reductant Injection Valve Circuit High (Bank 2 Unit 2)
- P2059Reductant Injection Air Pump Control Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.