Powertrain
generic / SAE
P2059
Reductant Injection Air Pump Control Circuit/Open
The control circuit driving the air-assist pump for DEF injection is open — atomisation air will not be available, dosing accuracy degrades.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 59
Possible causes
- Open winding or supply wire high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
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)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 100–700 €
- Estimated time: 0.7–2.5 h
- Component: reductant air pump
- Component: reductant air pump relay
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012