AutoCodes – Buick – B3138 Buick

B3138 Buick Code - All Door Lock Circuit High

Quick Answer

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator 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: B3138 Buick indicates All Door Lock Circuit High.
Common causes: Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator 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 492

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3138 Buick Description

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). When the BCM receives a lock input from a door lock switch, or a keyless entry transmitter, it applies battery positive voltage to the door lock actuator lock control circuit, a ground to the door lock actuator unlock control, and the driver door lock actuator unlock control circuits. When the BCM receives an unlock input from a door lock switch, it applies battery positive voltage to the door lock actuator unlock control, the driver door lock actuator unlock control circuits, and a ground to the door lock actuator lock control circuit. When the BCM receives an single Unlock input from a keyless entry transmitter, it applies battery positive voltage to the driver door lock actuator unlock control circuit and a ground to the door lock actuator lock control circuit to unlock the driver door. A second Unlock input from the transmitter applies battery positive voltage to the door lock actuator unlock control circuit, and a ground to the door lock actuator lock control circuit to unlock the passenger doors.

OBDII Code B3138 Buick - All Door Lock Circuit High - AutoCodes.com — B3138 Buick Code - All Door Lock Circuit High

What does this mean?

What are the Possible Causes of the DTC B3138 Buick?

Faulty Inoperative Door Lock Actuator
Inoperative Door Lock Actuator harness is open or shorted
Inoperative Door Lock Actuator circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3138 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 B3138 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 B3138 Buick Code

1. What are the common symptoms of OBDII code B3138 in a Buick related to the All Door Lock Circuit High?

- Common symptoms include all door locks malfunctioning, doors not locking or unlocking properly, and issues with the key fob.

2. What are the possible causes of the B3138 code in a Buick?

- The code may be triggered by a faulty door lock actuator, damaged wiring in the door lock circuit, a malfunctioning body control module (BCM), or a defective key fob.

3. How can I diagnose the cause of the B3138 code in my Buick?

- You can start by checking the wiring harness and connections in the door lock circuit, testing the door lock actuators for proper function, and scanning the BCM for any fault codes related to the door locks.

4. Can I still drive my Buick with the B3138 code present?

- It is generally safe to drive your Buick with the B3138 code, but you may experience issues with the door locks. It's recommended to get the issue diagnosed and repaired as soon as possible.

5. How can I repair the B3138 code in my Buick's All Door Lock Circuit High?

- Repair options may include replacing a faulty door lock actuator, repairing damaged wiring, resetting the BCM, or reprogramming the key fob. It's best to consult a professional mechanic for an accurate diagnosis and repair.

6. Are there any DIY tips for troubleshooting the B3138 code in my Buick?

- You can start by checking the fuse related to the door locks, ensuring the key fob battery is not dead, and inspecting the door lock actuators for any visible damage or signs of wear.

7. Will resetting the BCM clear the B3138 code in my Buick?

- Resetting the BCM may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.

8. Can a dead key fob battery cause the B3138 code in my Buick?

- Yes, a dead or malfunctioning key fob battery can cause communication issues with the BCM, leading to the B3138 code. It's advisable to replace the key fob battery as a first troubleshooting step.

9. What should I do if only one door lock is affected by the B3138 code in my Buick?

- If only one door lock is malfunctioning, it's likely a localized issue with that specific door lock actuator or wiring. Inspect and test the affected door lock for faults to pinpoint the problem.

10. How long does it typically take to repair the B3138 code in a Buick?

- The repair time for the B3138 code can vary depending on the underlying cause and the complexity of the repair. Simple fixes like replacing a fuse or key fob battery may take a short time, while more extensive repairs could require a few hours or more.