OBD-II code · Powertrain (generic, extended)
P2059 Reductant Injection Air Pump Control Circuit/Open
Reductant Injection Air Pump Control Circuit/Open: the control circuit is open. This valve doses reductant (DEF/AdBlue) into the exhaust for SCR NOx reduction.
Is it safe to drive with P2059?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen winding or supply wire
- 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
- 0.7–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Air Pump, Reductant Air Pump Relay
Related codes
- P2056Reductant Injection Valve Circuit/Open (Bank 2 Unit 2)
- P2057Reductant Injection Valve Circuit Low (Bank 2 Unit 2)
- P2058Reductant Injection Valve Circuit High (Bank 2 Unit 2)
- P205AReductant Tank Temperature Sensor A Circuit
- P205BReductant Tank Temperature Sensor A Circuit Range/Performance
- P205CReductant Tank Temperature Sensor A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.