P2059: Reductant Injection Air Pump Control Circuit/Open
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P2059 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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)
Common causes
- High Open winding or supply wire
- Low Pin pushed back out of connector body
- Low Cracked solder joint inside the module or sensor
Likelihood is a general estimate across vehicles; your make and model may differ.
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