P20AB — Reductant Injection Air Pressure Control Valve Stuck Closed

What Does P20AB Mean?

P20AB is a diagnostic trouble code indicating: Reductant Injection Air Pressure Control Valve Stuck Closed. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P20AB

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Injection Air Pressure Control Valve Stuck Closed not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Reductant Injection Air Pressure Control Valve Stuck Closed
🔍 Wiring or connector issue in Reductant Injection Air Pressure Control Valve Stuck Closed circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P20AB mean?

P20AB indicates: Reductant Injection Air Pressure Control Valve Stuck Closed. The vehicle's computer has detected that the Reductant Injection Air Pressure Control Valve Stuck Closed is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P20AB?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P20AB for extended periods may cause additional problems.

How much does it cost to fix P20AB?

Repair costs for P20AB typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Reductant Injection Air Pressure Control Valve Stuck Closed and related wiring
🔧 Replace faulty Reductant Injection Air Pressure Control Valve Stuck Closed

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P20AB: Reductant Injection Air Pressure Control Valve Stuck Closed