AutoCodes – Buick – B320B Buick

B320B Buick Code - Rear Door Window Motor

Quick Answer

The front door, rear door and middle door power window motors communicate with the Drivers Door Module (DDM), Passenger Door Module (PDM) and Rear Door Modules and Middle Door Modules over the LIN BUS. Common causes include Faulty Rear Door Window Motor, Rear Door Window Motor harness is open or shorted, Rear Door Window 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: B320B Buick indicates Rear Door Window Motor.
Common causes: Common causes include Faulty Rear Door Window Motor, Rear Door Window Motor harness is open or shorted, Rear Door Window 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 446

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 Mar 05, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B320B Buick Description

The front door, rear door and middle door power window motors communicate with the Drivers Door Module (DDM), Passenger Door Module (PDM) and Rear Door Modules and Middle Door Modules over the LIN BUS. The motors contain a logic module which must be normalized or programmed any time the window motor is serviced to provide proper operation and communication between door modules and window motors. The Diagnostic Trouble Code (DTC) sets when an internal malfunction has been detected by the DDM or PDM in the Front Door, Rear Door, or Middle Door window motor while commanding the window motor UP/DOWN.

OBDII Code B320B Buick - Rear Door Window Motor - AutoCodes.com — B320B Buick Code - Rear Door Window Motor

What does this mean?

What are the Possible Causes of the DTC B320B Buick?

Faulty Rear Door Window Motor
Rear Door Window Motor harness is open or shorted
Rear Door Window Motor circuit poor electrical connection
Faulty Rear Door Module

How to Fix the DTC B320B Buick?

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 does this mean?

Code Tech Notes

B320B 39 Rear Door Window Motor Internal Electronic Failure/Discard
B320B 42 Rear Door Window Motor Calibration Data Set Not Programmed
B320B 4B Rear Door Window Motor Calibration Not Learned

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B320B Buick 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.

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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 B320B Buick Code

1. What are common symptoms of OBDII code B320B related to the Buick rear door window motor?

- Common symptoms include the rear door window being stuck in one position, slow or erratic movement, or complete failure to operate.

2. What are the possible causes of OBDII code B320B on a Buick, specifically related to the rear door window motor?

- Possible causes include a faulty rear door window motor, damaged wiring or connectors, or a malfunctioning window regulator.

3. How can I diagnose the OBDII code B320B in my Buick's rear door window motor?

- Diagnosis typically involves using a scan tool to read the code, testing the window motor and regulator for proper operation, and inspecting the wiring for any damage.

4. Can I repair the OBDII code B320B related to the Buick rear door window motor myself?

- Depending on the underlying issue, you may be able to repair the problem yourself by replacing the window motor, repairing damaged wiring, or addressing any other identified issues.

5. Is it safe to drive my Buick with the OBDII code B320B related to the rear door window motor?

- It is generally safe to drive your Buick with this code, but you may experience inconvenience due to the window not functioning correctly. Consider repairing it as soon as possible.

6. Are there any temporary fixes for OBDII code B320B affecting the Buick rear door window motor?

- Temporary fixes may include manually assisting the window up or down, tapping the motor to try to get it moving, or checking for any obstructions in the window track.

7. How much does it typically cost to repair OBDII code B320B on a Buick related to the rear door window motor?

- The cost of repair can vary depending on the specific issue, but it may involve replacing the window motor, regulator, or addressing wiring problems. Costs can range from $100 to $500 or more.

8. Can weather or environmental factors contribute to OBDII code B320B in the Buick rear door window motor?

- Yes, exposure to moisture, extreme temperatures, or debris can potentially damage the window motor, wiring, or regulator, leading to the OBDII code B320B.

9. How long does it typically take to repair OBDII code B320B for the Buick rear door window motor?

- The repair time can vary based on the exact issue and your experience level. It may take anywhere from 1 to 4 hours to complete the repair.

10. Are there any preventive maintenance tips to avoid OBDII code B320B in the Buick rear door window motor?

- Regularly lubricating the window tracks, checking for any signs of wear or damage, and addressing any window operation issues promptly can help prevent the OBDII code B320B from occurring.