AutoCodes – GMC – B3147 GMC

B3147 GMC Code - Right Front Unlock Switch Circuit Low

Quick Answer

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock Switch 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: B3147 GMC indicates Right Front Unlock Switch Circuit Low.
Common causes: Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock Switch 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 522

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 B3147 GMC Description

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). When a door lock switch is activated to the Lock or Unlock function, the DDSA or PDM receives the switch input and sends the information on, via the Serial Data Class 2 communications line, to the Rear Integration Module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back to all the door modules to Lock or Unlock the doors. Each door module supplies power and ground to its associated lock actuator to Lock or Unlock the associated door.

OBDII Code B3147 GMC - Right Front Unlock Switch Circuit Low - AutoCodes.com — B3147 GMC Code - Right Front Unlock Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3147 GMC?

Faulty Right Front Power Door Lock Switch
Right Front Power Door Lock Switch harness is open or shorted
Right Front Power Door Lock Switch circuit poor electrical connection
Faulty Passenger Front Door Module (PDM)

How to Fix the DTC B3147 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 B3147 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 B3147 GMC Code

1. What are the common symptoms of OBDII code B3147 GMC (Right Front Unlock Switch Circuit Low)?

The common symptoms of this code may include difficulty unlocking the right front door using the switch, erratic behavior of the locking system, or the door not unlocking at all.

2. What are the possible causes of OBDII code B3147 GMC?

Possible causes of this code include a faulty right front unlock switch, damaged wiring or connectors in the unlock switch circuit, or a malfunctioning body control module.

3. How can I diagnose the issue causing OBDII code B3147 GMC?

Diagnosing this code typically involves inspecting the right front unlock switch, checking the wiring and connectors for damage, and using a scan tool to communicate with the body control module for further diagnosis.

4. Can a DIY enthusiast repair OBDII code B3147 GMC at home?

Depending on your experience and access to tools, a DIY repair of this code may be possible if the issue is limited to a faulty switch or damaged wiring. However, complex electronic or module-related issues may require professional assistance.

5. Are there any quick repair tips for OBDII code B3147 GMC?

Quick repair tips may include checking and cleaning the connectors related to the right front unlock switch, ensuring proper grounding of the switch, and resetting the system by disconnecting the car battery for a few minutes.

6. How serious is OBDII code B3147 GMC if left untreated?

If left untreated, this code may lead to continued issues with unlocking the right front door, potential electrical malfunctions in the locking system, or difficulties accessing the vehicle in certain situations.

7. Is it safe to continue driving with OBDII code B3147 GMC illuminated?

While it may be safe to drive with this code illuminated, it is recommended to address the underlying issue promptly to avoid potential inconvenience or safety concerns related to door unlocking problems.

8. How much does it typically cost to repair OBDII code B3147 GMC at a mechanic or dealership?

The cost of repairing this code can vary depending on the specific cause of the issue, labor rates in your area, and whether any parts need to be replaced. It's advisable to obtain quotes from different service providers.

9. Can extreme weather conditions affect OBDII code B3147 GMC?

Extreme weather conditions such as extreme cold or heat can potentially exacerbate issues related to the unlock switch circuit, leading to intermittent problems or failures in unlocking the right front door.

10. Is there a way to prevent OBDII code B3147 GMC from occurring in the future?

Regular maintenance of the door locking system, periodic inspection of the door switches and wiring, and addressing any issues promptly can help prevent the recurrence of this OBDII code in the future.