AutoCodes – Buick – B3970 Buick

B3970 Buick Code - Output Driver Module Performance

Quick Answer

The Body Control Module (BCM) internally grounds the driver door unlock relay control circuit for the driver door unlock relay when it receives an unlock switch signal from either door lock switch. Common causes include Faulty Driver Door Unlock Relay, Driver Door Unlock Relay harness is open or shorted, Driver Door Unlock Relay 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: B3970 Buick indicates Output Driver Module Performance.
Common causes: Common causes include Faulty Driver Door Unlock Relay, Driver Door Unlock Relay harness is open or shorted, Driver Door Unlock Relay 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 468

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 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3970 Buick Description

The Body Control Module (BCM) internally grounds the driver door unlock relay control circuit for the driver door unlock relay when it receives an unlock switch signal from either door lock switch. When the BCM grounds the driver door unlock relay control circuit the driver door unlock relay is energized and unlocks the driver door. The Diagnostic Trouble Code (DTC) will set if the driver door unlock relay control circuit is shorted to ground or open for more then one second.

OBDII Code B3970 Buick - Output Driver Module Performance - AutoCodes.com — B3970 Buick Code - Output Driver Module Performance

What does this mean?

What are the Possible Causes of the DTC B3970 Buick?

Faulty Driver Door Unlock Relay
Driver Door Unlock Relay harness is open or shorted
Driver Door Unlock Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3970 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3970 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 B3970 Buick Code

1. What are common symptoms of OBDII code B3970 Buick (Output Driver Module Performance)?

- Common symptoms include issues with engine performance, misfires, and illuminated warning lights on the dashboard.

2. What causes the OBDII code B3970 Buick to trigger?

- This code is typically triggered by a fault in the output driver module, which controls various components in the vehicle.

3. How can I diagnose the OBDII code B3970 Buick?

- Diagnosing this code usually involves using a scan tool to retrieve the specific fault code and then testing the output driver module for proper function.

4. Can a faulty output driver module be repaired, or does it need to be replaced?

- In most cases, a faulty output driver module will need to be replaced to resolve the B3970 Buick code.

5. Are there any common issues that can lead to the output driver module performance problem?

- Common issues that can lead to this problem include electrical shorts, wiring issues, or component failures within the output driver module itself.

6. Is it safe to continue driving my Buick with the B3970 code present?

- It is not recommended to continue driving with the B3970 code present, as it can lead to further damage to the vehicle and potential safety hazards.

7. Can resetting the OBDII code B3970 Buick temporarily fix the issue?

- Resetting the code may temporarily clear the warning light, but the underlying issue causing the code will still need to be addressed to prevent it from reoccurring.

8. How much does it typically cost to repair the OBDII code B3970 Buick?

- The cost of repairing the B3970 Buick code can vary depending on the extent of the issue and whether the output driver module needs to be replaced.

9. Are there any DIY repair tips for addressing the B3970 Buick code?

- DIY repair is not recommended for this code, as it often requires specialized knowledge and tools to properly diagnose and repair the issue.

10. Can a mechanic easily fix the B3970 Buick code, or is it a complex repair?

- A qualified mechanic should be able to diagnose and repair the B3970 Buick code, but the complexity of the repair will depend on the specific cause of the issue.