AutoCodes – Generic – P209A

P209A Code - Reductant Injection Air Pressure Sensor 'B' Circuit

Quick Answer

The Reductant Injection Air Pressure Sensor sends voltage reading information to the Powertrain Control Module (PCM). Common causes include Faulty Reductant Injection Air Pressure Sensor, Reductant Injection Air Pressure Sensor harness is open or shorted, Reductant Injection Air Pressure Sensor 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: P209A indicates Reductant Injection Air Pressure Sensor 'B' Circuit.
Common causes: Common causes include Faulty Reductant Injection Air Pressure Sensor, Reductant Injection Air Pressure Sensor harness is open or shorted, Reductant Injection Air Pressure Sensor 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 5,835

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 P209A Description

The Reductant Injection Air Pressure Sensor sends voltage reading information to the Powertrain Control Module (PCM). The PCM interprets these readings as pressure or exhaust gas temperature. The code is set when the voltage sent from the sensor to the PCM is out of factory specifications.

OBDII Code P209A - Reductant Injection Air Pressure Sensor 'B' Circuit - AutoCodes.com — P209A Code - Reductant Injection Air Pressure Sensor 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P209A?

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

How to Fix the DTC P209A?

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 P209A 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.

Need more information about the P209A code?

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Information for Specific Makes

P209A Chevrolet — Reductant Injection Air Pressure Sensor 'B' Circuit
P209A Dodge — Reductant Injection Air Pressure Sensor 'B' Circuit
P209A Ford — Reductant Injection Air Pressure Sensor 'B' Circuit
P209A GMC — Reductant Injection Air Pressure Sensor 'B' Circuit

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.