AutoCodes – Generic – B1639

B1639 Code - Mirror Passenger Left Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Mirror Passenger Motor. Common causes include Faulty Mirror Passenger Motor, Mirror Passenger Motor harness is open or shorted, Mirror Passenger 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: B1639 indicates Mirror Passenger Left Circuit Failure.
Common causes: Common causes include Faulty Mirror Passenger Motor, Mirror Passenger Motor harness is open or shorted, Mirror Passenger 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 5,996

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 May 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1639 Description

The Body Control Module (BCM) monitors the Mirror Passenger Motor. The BCM sets the OBDII code when the Mirror Passenger Motor is not to factory specifications.

OBDII Code B1639 - Mirror Passenger Left Circuit Failure - AutoCodes.com — B1639 Code - Mirror Passenger Left Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1639?

Faulty Mirror Passenger Motor
Mirror Passenger Motor harness is open or shorted
Mirror Passenger Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1639?

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 B1639 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 B1639 code?

Need more information on how to fix the B1639 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B1639 Code

1. What are the common symptoms of OBDII code B1639 (Mirror Passenger Left Circuit Failure)?

The common symptoms include the passenger side mirror not adjusting or moving properly, and the mirror indicator light on the switch not functioning.

2. What are some possible causes of OBDII code B1639?

Possible causes include a faulty mirror motor, damaged wiring or connectors in the mirror circuit, a defective mirror switch, or issues with the mirror control module.

3. How can I diagnose the Mirror Passenger Left Circuit Failure code B1639?

Diagnosing this code involves checking the mirror motor operation, inspecting the wiring and connectors for damage, testing the mirror switch functionality, and scanning the mirror control module for any fault codes.

4. Can I still drive my vehicle with OBDII code B1639 present?

Yes, you can still drive your vehicle with this code present, but it is recommended to address the issue to ensure proper operation of the passenger side mirror.

5. How can I repair OBDII code B1639 myself?

You can repair this code by first checking the mirror motor and wiring for any issues, replacing any faulty components, and clearing the code using an OBDII scanner. If unsure, consult a professional mechanic for assistance.

6. Is it safe to fix OBDII code B1639 on my own?

If you have experience working with automotive electrical systems, you can attempt to fix this code on your own. However, if you are unsure or unfamiliar with this type of repair, it is best to seek help from a qualified mechanic.

7. Will resetting the OBDII code B1639 make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not resolved, the code is likely to return. It's essential to diagnose and fix the root cause of the problem.

8. How much does it typically cost to repair OBDII code B1639?

The cost of repairing this code can vary depending on the specific issue causing it, the labor rates in your area, and the cost of any replacement parts needed. It is recommended to get a few quotes from mechanics for an accurate estimate.

9. Can extreme weather conditions cause OBDII code B1639 to trigger?

Extreme weather conditions, especially moisture and corrosion, can potentially contribute to the development of electrical issues that trigger code B1639. It is important to keep the vehicle's electrical components well-maintained to prevent such problems.

10. Will fixing OBDII code B1639 improve my vehicle's overall performance?

Fixing this code may not directly impact your vehicle's performance but will ensure the proper functioning of the passenger side mirror, which is essential for safe driving and visibility.