AutoCodes – GMC – B3797 GMC

B3797 GMC Code - All Door Dead Lock Circuit

Quick Answer

The Body Control Module (BCM) powers the reversible door latch assemblies by providing battery positive voltage and ground to the appropriate lock and unlock control circuits of the door latch assemblies. Common causes include Faulty Door Latch Assembly, Door Latch Assembly harness is open or shorted, Door Latch Assembly 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: B3797 GMC indicates All Door Dead Lock Circuit.
Common causes: Common causes include Faulty Door Latch Assembly, Door Latch Assembly harness is open or shorted, Door Latch Assembly 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 663

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3797 GMC Description

The Body Control Module (BCM) powers the reversible door latch assemblies by providing battery positive voltage and ground to the appropriate lock and unlock control circuits of the door latch assemblies. The lock and unlock control circuits of the rear doors and passenger door latch assemblies are all connected together. When the door latch assemblies are not active, all actuator lock and unlock control circuits are supplied a floating voltage used by the BCM to perform diagnostic functions on the circuits. Transitioning of the lock actuators to the lock or unlocked position depends upon which control circuits receive voltage and which control circuits receive ground.
The instrument panel right fuse block contains a PCB relay which controls the functions of the electronic child locks which is part of the rear door latch assemblies. When the relay is in its inactive state and the BCM commands the latches to LOCK and UNLOCK, voltage will pass through the relay contacts for normal LOCK and UNLOCK functions of the passenger, left rear and right rear door latch assemblies.
The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the door lock relay control circuit.

OBDII Code B3797 GMC - All Door Dead Lock Circuit - AutoCodes.com — B3797 GMC Code - All Door Dead Lock Circuit

What does this mean?

What are the Possible Causes of the DTC B3797 GMC?

Faulty Door Latch Assembly
Door Latch Assembly harness is open or shorted
Door Latch Assembly circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3797 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3797 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 B3797 GMC Code

1. What are the common symptoms of OBDII code B3797 GMC - All Door Dead Lock Circuit?

- The common symptoms include all doors being unable to lock or unlock using the central locking system.

2. What are the possible causes of the B3797 GMC code?

- The code B3797 GMC can be triggered by a faulty door lock actuator, wiring issues, or a malfunctioning central locking control module.

3. How can I diagnose the All Door Dead Lock Circuit issue?

- To diagnose the issue, you can perform a visual inspection of the door lock actuators and wiring connections, as well as use an OBDII scanner to read the specific error codes.

4. Can I still drive my vehicle with the B3797 code present?

- While it may be possible to drive the vehicle with the code present, it is recommended to address the issue promptly to avoid potential security and convenience concerns.

5. How can I repair the All Door Dead Lock Circuit problem?

- The repair process may involve replacing the faulty door lock actuator, repairing damaged wiring, or reprogramming the central locking control module.

6. Are there any DIY tips for fixing the B3797 GMC code?

- DIY tips for fixing the code may include checking and securing loose wiring connections, lubricating the door lock mechanisms, and ensuring proper alignment of the door latches.

7. Is it necessary to reset the OBDII system after repairing the B3797 code?

- It is recommended to reset the OBDII system after repairing the B3797 code to clear the error code and ensure proper functionality of the central locking system.

8. Can extreme weather conditions affect the All Door Dead Lock Circuit issue?

- Yes, extreme weather conditions such as cold temperatures or humidity can potentially worsen the symptoms associated with the B3797 GMC code.

9. How can I prevent the recurrence of the B3797 code in the future?

- To prevent the recurrence of the B3797 code, regular maintenance of the door lock system, including lubrication and inspection, can help identify and address potential issues early.

10. Is it advisable to seek professional help for diagnosing and repairing the B3797 GMC code?

- If you are not experienced in automotive diagnostics and repairs, it is advisable to seek professional help to accurately diagnose and repair the All Door Dead Lock Circuit issue.