P20AB Possible Causes
- Faulty reductant injection air pressure control valve
- Reductant injection air pressure control valve circuit open or shorted
- Poor electrical connection in reductant injection air pressure control valve circuit
What Does It Mean?
How to Fix Code P20AB
Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P20AB Possible Symptoms
Engine light on (or service engine soon warning light)
P20AB Meaning
Reductant injection air pressure control valve stuck closed is the generic description for code P20AB, but the manufacturer may have a different description.