AutoCodes – Infiniti – B2639 Infiniti

B2639 Infiniti Code - Driver DEF Door Fail

Quick Answer

The Air Condition (A/C) Automatic Amplifier monitors the Front Mode Door Motor position. Common causes include Faulty Front Mode Door Motor, Front Mode Door Motor harness is open or shorted, Front Mode Door Motor 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: B2639 Infiniti indicates Driver DEF Door Fail.
Common causes: Common causes include Faulty Front Mode Door Motor, Front Mode Door Motor harness is open or shorted, Front Mode Door Motor 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 550

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 Jan 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2639 Infiniti Description

The Air Condition (A/C) Automatic Amplifier monitors the Front Mode Door Motor position. The A/C Automatic Amplifier sets the Diagnostic Trouble Code (DTC) when the malfunctioning door position is detected at DEF position.

OBDII Code B2639 Infiniti - Driver DEF Door Fail - AutoCodes.com — B2639 Infiniti Code - Driver DEF Door Fail

What does this mean?

What are the Possible Causes of the DTC B2639 Infiniti?

Faulty Front Mode Door Motor
Front Mode Door Motor harness is open or shorted
Front Mode Door Motor circuit poor electrical connection
Front Mode Door Motor control linkage installation condition
Faulty Air Condition (A/C) Automatic Amplifier

How to Fix the DTC B2639 Infiniti?

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 B2639 Infiniti 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 B2639 Infiniti code?

Need more information on how to fix the B2639 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2639 Infiniti code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about B2639 Infiniti Code

1. What are the common symptoms of OBDII code B2639 Infiniti "Driver DEF Door Fail"?

The common symptoms include the Check Engine Light coming on, difficulty starting the vehicle, and issues with the diesel exhaust fluid system.

2. What are the possible causes of the OBDII code B2639 "Driver DEF Door Fail" in an Infiniti?

Possible causes include a faulty DEF door sensor, wiring issues, a malfunctioning DEF door actuator, or a problem with the control module.

3. How can I diagnose the OBDII code B2639 "Driver DEF Door Fail" in my Infiniti?

You can diagnose the code by using a diagnostic scanner to read the code and check the DEF door sensor, actuator, and wiring for any faults or damage.

4. Can I still drive my Infiniti with the OBDII code B2639 "Driver DEF Door Fail"?

It is not recommended to drive your vehicle with this code as it can lead to performance issues and potentially cause further damage to the diesel exhaust fluid system.

5. How can I repair the OBDII code B2639 "Driver DEF Door Fail" in my Infiniti?

You may need to replace the DEF door sensor, repair any wiring issues, or replace the DEF door actuator to resolve the code.

6. Is the OBDII code B2639 "Driver DEF Door Fail" a serious issue in an Infiniti?

Yes, it is a serious issue as it can affect the proper functioning of the diesel exhaust fluid system, which is important for emissions control.

7. How much does it cost to repair the OBDII code B2639 "Driver DEF Door Fail" in an Infiniti?

The cost of repair can vary depending on the specific cause of the code and the labor rates in your area. It's recommended to consult with a mechanic for an accurate estimate.

8. Can a DIY enthusiast fix the OBDII code B2639 "Driver DEF Door Fail" in an Infiniti?

While some aspects of the repair may be DIY-friendly, diagnosing and repairing the exact cause of the code may require specialized tools and expertise. It's best to consult with a professional mechanic.

9. Will resetting the OBDII code B2639 "Driver DEF Door Fail" make it go away permanently?

Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the code.

10. How often does the OBDII code B2639 "Driver DEF Door Fail" occur in Infiniti vehicles?

The occurrence of this code can vary depending on the vehicle's age, mileage, and maintenance history. If you are experiencing this code frequently, it's best to have your vehicle inspected by a professional.