AutoCodes – Generic – P040F

P040F Code - Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation

Quick Answer

The Engine Control Module (ECM) monitors the Exhaust Gas Recirculation (EGR) Temperature Sensor 'A' and 'B' Circuit Performance, which measures the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Recirculation Temperature Sensor 'A' or 'B', Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' 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: P040F indicates Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation.
Common causes: Common causes include Faulty Exhaust Gas Recirculation Temperature Sensor 'A' or 'B', Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,443

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 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P040F Description

The Engine Control Module (ECM) monitors the Exhaust Gas Recirculation (EGR) Temperature Sensor 'A' and 'B' Circuit Performance, which measures the temperature of the exhaust gas. The EGR Temperature Sensor functions by increasing the resistance with increasing exhaust gas temperature. The ECM sets the OBDII code when the EGR Temperature Sensor signal is not to factory specifications.

OBDII Code P040F - Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation - AutoCodes.com — P040F Code - Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P040F?

Faulty Exhaust Gas Recirculation Temperature Sensor 'A' or 'B'
Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' harness is open or shorted
Exhaust Gas Recirculation Temperature Sensor 'A' or 'B' circuit poor electrical connection

How to Fix the DTC P040F?

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 P040F 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 P040F code?

Need more information on how to fix the P040F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P040F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P040F Chevrolet — Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation
P040F Dodge — Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation
P040F Ford — Exhaust Gas Recirculation Temperature Sensor 'A'/'B' Correlation
P040F GMC — Exhaust Gas Recirculation Temperature Sensor 'A'/'B' 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.