OBD-II code · Powertrain (generic, extended)
P2049 Reductant Injection Valve Circuit High (Bank 1 Unit 1)
Reductant Injection Valve Circuit High (Bank 1 Unit 1): the signal voltage is above the expected range. This valve doses reductant (DEF/AdBlue) into the exhaust for SCR NOx reduction.
Is it safe to drive with P2049?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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)
- P2052Reductant Injection Valve Circuit High (Bank 2 Unit 1)
- P2055Reductant Injection Valve Circuit High (Bank 1 Unit 2)
- P2058Reductant Injection Valve Circuit High (Bank 2 Unit 2)
- P2046Reductant Temperature Sensor A Circuit Intermittent
- P2048Reductant Injection Valve Circuit Low (Bank 1 Unit 1)
- P204AReductant Pressure Sensor Circuit
- P204BReductant Pressure Sensor Circuit Range/Performance
- P204CReductant Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.