AutoCodes – Generic – P20AA

P20AA Code - Reductant Injection Air Pressure Control Valve Stuck Open

Quick Answer

P20AA indicates Reductant Injection Air Pressure Control Valve Stuck Open. Common causes include Faulty Reductant Injection Air Pressure Control Valve, Reductant Injection Air Pressure Control Valve harness is open or shorted, Reductant Injection Air Pressure Control Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P20AA indicates Reductant Injection Air Pressure Control Valve Stuck Open.
Common causes: Common causes include Faulty Reductant Injection Air Pressure Control Valve, Reductant Injection Air Pressure Control Valve harness is open or shorted, Reductant Injection Air Pressure Control Valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,083

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P20AA Description

OBDII Code P20AA - Reductant Injection Air Pressure Control Valve Stuck Open - AutoCodes.com — P20AA Code - Reductant Injection Air Pressure Control Valve Stuck Open

What does this mean?

What are the Possible Causes of the DTC P20AA?

Faulty Reductant Injection Air Pressure Control Valve
Reductant Injection Air Pressure Control Valve harness is open or shorted
Reductant Injection Air Pressure Control Valve circuit poor electrical connection

How to Fix the DTC P20AA?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P20AA code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.