AutoCodes – Nissan – B2639 Nissan

B2639 Nissan 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 Nissan 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 3,146

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 Nissan 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 Nissan - Driver DEF Door Fail - AutoCodes.com — B2639 Nissan Code - Driver DEF Door Fail

What does this mean?

What are the Possible Causes of the DTC B2639 Nissan?

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 Nissan?

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 Nissan 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 Nissan code?

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

Need Help with the Code?

Get the B2639 Nissan 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 Nissan Code

1. What are the common symptoms of OBDII code B2639 Nissan (Driver DEF Door Fail)?

- Common symptoms include the Check Engine Light being illuminated, difficulty opening or closing the driver's side DEF door, and potential issues with the DEF system.

2. What are the possible causes of OBDII code B2639 Nissan (Driver DEF Door Fail)?

- The code may be triggered by a faulty DEF door actuator, damaged wiring or connectors related to the DEF door, or a malfunctioning DEF door switch.

3. How can I diagnose the cause of OBDII code B2639 Nissan (Driver DEF Door Fail)?

- To diagnose the issue, you can visually inspect the DEF door and its components, test the DEF door actuator and switch for proper function, and check for any damaged wiring or connectors.

4. Can I continue driving my vehicle with OBDII code B2639 Nissan (Driver DEF Door Fail)?

- It is recommended to address the issue promptly to prevent potential DEF system malfunctions. However, if the vehicle is running normally and there are no other issues, it may be safe to drive to a repair facility.

5. How can I repair OBDII code B2639 Nissan (Driver DEF Door Fail)?

- Repair options may include replacing the DEF door actuator, repairing or replacing damaged wiring or connectors, or recalibrating the DEF door switch. It is advisable to consult a professional mechanic for proper repair.

6. Will resetting the OBDII code B2639 Nissan (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 reoccur. It is essential to diagnose and repair the root cause of the problem.

7. Can extreme weather conditions affect OBDII code B2639 Nissan (Driver DEF Door Fail)?

- Extreme temperatures or moisture can potentially exacerbate issues with the DEF door actuator, wiring, or switch, leading to the triggering of the B2639 code. Proper maintenance and care can help prevent these issues.

8. Is OBDII code B2639 Nissan (Driver DEF Door Fail) a common problem in certain Nissan models?

- The occurrence of this specific code may vary among different Nissan models and years. However, issues related to the DEF door and actuator can be seen in various vehicles equipped with DEF systems.

9. Are there any DIY fixes for OBDII code B2639 Nissan (Driver DEF Door Fail)?

- While some basic inspections like checking for loose connections or damaged wiring can be done by DIY enthusiasts, complex repairs involving component replacement or recalibration should be handled by a professional mechanic.

10. How can regular maintenance help prevent OBDII code B2639 Nissan (Driver DEF Door Fail)?

- Regularly inspecting and lubricating the DEF door components, keeping the area clean from debris, and addressing any DEF system issues promptly can help prevent the occurrence of code B2639 and ensure proper system operation.