AutoCodes – Generic – B3138

B3138 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 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 2,646

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

What does this mean?

What are the Possible Causes of the DTC B3138?

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?

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 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.

Need more information about the B3138 code?

Need more information on how to fix the B3138 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3138 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3138 Buick — All Door Lock Circuit High
B3138 Cadillac — All Door Lock Circuit High
B3138 Chevrolet — All Door Lock Circuit High
B3138 GMC — All Door Lock Circuit High

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 Code

1. What are the common symptoms of OBDII code B3138 (All Door Lock Circuit High)?

- Common symptoms include difficulty locking or unlocking all doors, doors locking or unlocking on their own, and the interior lights staying on.

2. What are the potential causes of OBDII code B3138?

- Possible causes include a faulty door lock switch, damaged wiring in the door harness, a malfunctioning door lock actuator, or a problem with the body control module.

3. How can I diagnose the root cause of OBDII code B3138?

- You can diagnose the issue by checking the door lock switches, inspecting the wiring for any damage, testing the door lock actuators, and using a diagnostic scanner to read the trouble codes stored in the body control module.

4. What are some repair tips for fixing OBDII code B3138?

- Repair tips include checking and replacing any faulty door lock switches, repairing damaged wiring, replacing malfunctioning door lock actuators, and reprogramming or replacing the body control module if necessary.

5. Can OBDII code B3138 cause any safety concerns?

- While OBDII code B3138 itself may not pose immediate safety risks, malfunctioning door locks can compromise vehicle security and passenger safety. It is important to address this issue promptly.

6. Is it possible to reset OBDII code B3138 without repairing the underlying issue?

- Resetting the code without fixing the root cause may temporarily clear the error code, but the issue will likely resurface. It is recommended to diagnose and repair the problem to prevent further complications.

7. Can a DIY enthusiast fix OBDII code B3138, or should it be handled by a professional mechanic?

- Depending on your skill level and experience with automotive repairs, you may be able to address OBDII code B3138 on your own. However, complex electrical issues may require the expertise of a professional mechanic.

8. How much does it typically cost to repair OBDII code B3138?

- The cost of repairing OBDII code B3138 can vary depending on the root cause of the issue, the parts needed for replacement, and whether you choose to do the repairs yourself or seek professional help. Costs may range from a few hundred dollars to over a thousand dollars.

9. Will OBDII code B3138 prevent my vehicle from passing an emissions test?

- OBDII code B3138 is related to the door lock circuit and is not directly related to emissions control. However, unresolved issues with the code may indicate other underlying problems that could affect emissions and overall vehicle performance.

10. How can I prevent OBDII code B3138 from recurring in the future?

- To prevent OBDII code B3138 from recurring, regularly inspect and maintain your vehicle's door locks, wiring, and control modules. Address any issues promptly to avoid further complications.