P20AA
Reductant Injection Air Pressure Control Valve Stuck Open
P20AA is an OBD-II diagnostic trouble code meaning: Reductant Injection Air Pressure Control Valve Stuck Open. Common causes: mechanical valve jamming, valve contamination. Estimated repair cost: $33–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased consumption of AdBlue reagent
- Increased NOx emissions
- Possible SCR system error messages on the instrument panel
Causes
- Mechanical valve jamming
- Valve contamination
- Valve wiring problems
- Malfunction of the SCR system control module
- Damage to the pneumatic tubes of the system
How to Fix
- Check the condition of the air pressure control valve
- Clean or replace a stuck valve
- Check the integrity of electrical wiring and connectors
- Check the operation of the SCR system control module
- Check the tightness of the pneumatic system
Related codes
Error P20AA by Vehicle Brand
FAQ
What does the P20AA code mean?
P20AA is an OBD-II diagnostic trouble code that indicates: Reductant Injection Air Pressure Control Valve Stuck Open
What causes a P20AA error code?
The most common causes of P20AA include: Mechanical valve jamming; Valve contamination; Valve wiring problems; Malfunction of the SCR system control module.
How do I fix a P20AA diagnostic trouble code?
To fix P20AA: Check the condition of the air pressure control valve. Clean or replace a stuck valve. Check the integrity of electrical wiring and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20AA?
Yes, but get it checked soon
How much does it cost to fix P20AA?
The estimated repair cost for P20AA is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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