AutoCodes – GMC – B320A GMC

B320A GMC Code - Front 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 Front Door Window Motor, Front Door Window Motor harness is open or shorted, Front 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: B320A GMC indicates Front Door Window Motor.
Common causes: Common causes include Faulty Front Door Window Motor, Front Door Window Motor harness is open or shorted, Front 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 946

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 B320A GMC 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 B320A GMC - Front Door Window Motor - AutoCodes.com — B320A GMC Code - Front Door Window Motor

What does this mean?

What are the Possible Causes of the DTC B320A GMC?

Faulty Front Door Window Motor
Front Door Window Motor harness is open or shorted
Front Door Window Motor circuit poor electrical connection
Faulty Drivers Door Module (DDM)

How to Fix the DTC B320A GMC?

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

B320A 39 Front Door Window Motor Internal Electronic Failure/Discard
B320A 42 Front Door Window Motor Calibration Data Set Not Programmed
B320A 4B Front Door Window Motor Calibration Not Learned

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B320A GMC 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 B320A GMC Code

1. What are common symptoms of OBDII code B320A GMC related to the front door window motor?

- Common symptoms include the front door window being unable to roll up or down, erratic window movement, or the window getting stuck in one position.

2. What can cause OBDII code B320A GMC to trigger in relation to the front door window motor?

- The code may be triggered by a faulty front door window motor, damaged wiring or connectors, or a malfunctioning window regulator.

3. How can I diagnose the cause of OBDII code B320A GMC for the front door window motor?

- Diagnose by checking the window motor operation, inspecting the wiring for damage, testing the power and ground connections, and examining the window regulator for proper function.

4. What is the recommended repair for OBDII code B320A GMC associated with the front door window motor?

- Repair involves replacing the faulty front door window motor, repairing any damaged wiring or connectors, and ensuring proper alignment and operation of the window regulator.

5. Are there any DIY tips for fixing OBDII code B320A GMC related to the front door window motor?

- DIY tips include checking the fuse related to the window motor, ensuring the window is not obstructed, and testing the window switch for proper functionality before replacing parts.

6. Can a malfunctioning front door window motor cause other issues in the vehicle?

- Yes, a malfunctioning front door window motor can lead to issues such as water leaks, security concerns, and potential damage to the window regulator if not addressed promptly.

7. Is it safe to continue driving with OBDII code B320A GMC triggered for the front door window motor?

- Continuing to drive with this code triggered can be risky as it may compromise the safety and security of the vehicle, especially if the window is stuck in a partially open position.

8. How long does it typically take to repair OBDII code B320A GMC concerning the front door window motor?

- The repair time can vary depending on the extent of the issue, but it generally takes 1-2 hours to replace the front door window motor and address any related wiring or regulator problems.

9. Are there any preventative maintenance steps to avoid OBDII code B320A GMC for the front door window motor?

- Regularly lubricating the window tracks, checking for any unusual noises or movements, and addressing minor window issues promptly can help prevent the code from triggering.

10. Can I reset OBDII code B320A GMC related to the front door window motor using a simple reset tool?

- Yes, you can reset the code using an OBDII scanner or code reader after the repair has been completed to clear the error code and reset the vehicle's system.