AutoCodes – Generic – P009A

P009A Code - Intake Air Temperature/Ambient Air Temperature Correlation

Quick Answer

The P009A code indicates that the Intake Air Temperature (IAT) and Ambient Air Temperature (AAT) sensor readings differ by more than a calibrated value. Common causes include Faulty Intake Air Temperature (IAT) or Ambient Air Temperature (AAT) sensor, Biased IAT or AAT sensor. 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: P009A indicates Intake Air Temperature/Ambient Air Temperature Correlation.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) or Ambient Air Temperature (AAT) sensor, Biased IAT or AAT sensor.
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 6,872

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 Apr 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P009A Description

The P009A code indicates that the Intake Air Temperature (IAT) and Ambient Air Temperature (AAT) sensor readings differ by more than a calibrated value.

OBDII Code P009A - Intake Air Temperature/Ambient Air Temperature Correlation - AutoCodes.com — P009A Code - Intake Air Temperature/Ambient Air Temperature Correlation

What does this mean?

What are the Possible Causes of the DTC P009A?

Faulty Intake Air Temperature (IAT) or Ambient Air Temperature (AAT) sensor
Biased IAT or AAT sensor

How to Fix the DTC P009A?

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 P009A 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 P009A code?

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Information for Specific Makes

P009A Ford — Intake Air Temperature/Ambient Air Temperature Correlation
P009A Lincoln — Intake Air Temperature/Ambient Air Temperature Correlation
P009A Mercedes-Benz — Intake Air Temperature/Ambient Air Temperature Correlation
P009A Mercury — Intake Air Temperature/Ambient Air Temperature Correlation

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.