AutoCodes – Cadillac – B320C Cadillac

B320C Cadillac Code - Middle 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 Middle Door Window Motor, Middle Door Window Motor harness is open or shorted, Middle 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: B320C Cadillac indicates Middle Door Window Motor.
Common causes: Common causes include Faulty Middle Door Window Motor, Middle Door Window Motor harness is open or shorted, Middle 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 439

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 B320C Cadillac 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 B320C Cadillac - Middle Door Window Motor - AutoCodes.com — B320C Cadillac Code - Middle Door Window Motor

What does this mean?

What are the Possible Causes of the DTC B320C Cadillac?

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

How to Fix the DTC B320C Cadillac?

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

B320C 39 Middle Door Window Motor Internal Electronic Failure/Discard
B320C 42 Middle Door Window Motor Calibration Data Set Not Programmed
B320C 4B Middle Door Window Motor Calibration Not Learned

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B320C Cadillac 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 B320C Cadillac Code

1. What does the OBDII code B320C mean on a Cadillac?

The B320C code indicates an issue with the middle door window motor circuit, often due to electrical or mechanical failure.

2. What are the symptoms of the B320C code on a Cadillac?

Symptoms may include the middle door window not operating, intermittent window movement, or unusual noises when attempting to use the window.

3. What causes the B320C code to appear on a Cadillac?

Common causes include a faulty window motor, damaged wiring or connectors, a blown fuse, or a malfunctioning control module.

4. How can I diagnose the B320C code on a Cadillac?

Diagnose the issue by inspecting the window motor, checking the wiring and connectors for damage, and testing the voltage supply to the motor.

5. Can I still drive my Cadillac with the B320C code active?

Yes, the vehicle is drivable, but the affected window may not function properly, which could be inconvenient or a safety concern in certain situations.

6. How do I fix the B320C code on a Cadillac?

Repairs may include replacing the middle door window motor, repairing damaged wiring, or replacing a blown fuse or faulty control module.

7. How much does it cost to repair the B320C code on a Cadillac?

Repair costs can vary depending on the issue, but replacing a window motor typically costs $200â€“$400, including parts and labor.

8. Can I clear the B320C code without fixing the problem?

Clearing the code without fixing the underlying issue will likely result in the code returning as the problem persists.

9. Is the B320C code common on all Cadillac models?

This code is more likely to appear on models with power-operated middle door windows, which may vary depending on the vehicleâ€™s design.

10. Do I need special tools to repair the B320C code on a Cadillac?

Basic tools like a multimeter and a screwdriver may suffice for diagnosing and repairing the issue, but specialized tools may be needed for certain vehicle-specific repairs.