AutoCodes – Buick – B3142 Buick

B3142 Buick Code - Left 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 Left Front Power Door Lock Switch, Left Front Power Door Lock Switch harness is open or shorted, Left 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: B3142 Buick indicates Left Front Unlock Switch Circuit Low.
Common causes: Common causes include Faulty Left Front Power Door Lock Switch, Left Front Power Door Lock Switch harness is open or shorted, Left 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 432

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B3142 Buick 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 B3142 Buick - Left Front Unlock Switch Circuit Low - AutoCodes.com — B3142 Buick Code - Left Front Unlock Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3142 Buick?

Faulty Left Front Power Door Lock Switch
Left Front Power Door Lock Switch harness is open or shorted
Left Front Power Door Lock Switch circuit poor electrical connection
Faulty Driver Door Switch Assembly (DDSA)

How to Fix the DTC B3142 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 B3142 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.

Need more information about the B3142 Buick code?

Need more information on how to fix the B3142 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3142 Buick code diagnosed by a professional: Find a repair shop in your area

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 B3142 Buick Code

1. What are the common symptoms of OBDII code B3142 in a Buick related to the Left Front Unlock Switch Circuit Low?

- Common symptoms include difficulty unlocking the left front door using the switch, unresponsive door lock controls, and possible issues with the central locking system.

2. What are the possible causes of the B3142 code in a Buick?

- The B3142 code in a Buick indicating a Left Front Unlock Switch Circuit Low can be caused by a faulty unlock switch, damaged wiring or connectors in the circuit, or a malfunctioning body control module.

3. How can I diagnose the B3142 code related to the left front unlock switch circuit low in my Buick?

- To diagnose the B3142 code, you can start by inspecting the wiring and connectors for any visible damage, testing the unlock switch for proper functionality, and using a diagnostic scanner to check for specific trouble codes.

4. Is it safe to continue driving with the B3142 code in my Buick?

- It is generally safe to continue driving with the B3142 code related to the Left Front Unlock Switch Circuit Low in your Buick, but you may experience inconvenience related to door locking and unlocking functions.

5. How can I repair the B3142 code in my Buick if it indicates a left front unlock switch circuit low issue?

- Repairing the B3142 code involves identifying and fixing the root cause, which may include replacing the faulty unlock switch, repairing damaged wiring or connectors, or reprogramming the body control module if necessary.

6. Can a DIY enthusiast fix the B3142 code in a Buick at home?

- While some DIY enthusiasts may be able to diagnose and repair the B3142 code related to the Left Front Unlock Switch Circuit Low in a Buick, it is recommended to have the issue addressed by a professional mechanic for accurate diagnosis and proper repair.

7. Will resetting the OBDII system clear the B3142 code in my Buick?

- Resetting the OBDII system may temporarily clear the B3142 code, but if the underlying issue causing the Left Front Unlock Switch Circuit Low problem is not addressed, the code is likely to reappear after some time.

8. How can I prevent the B3142 code from coming back in my Buick after repair?

- To prevent the B3142 code from reoccurring, ensure that all repairs are done correctly, use quality replacement parts if needed, and regularly inspect the door lock system for any signs of wear or damage.

9. Is the B3142 OBDII code specific to Buick vehicles only?

- The B3142 OBDII code related to the Left Front Unlock Switch Circuit Low is specific to Buick vehicles and may not apply to other car makes and models.

10. How much can I expect to pay for repairing the B3142 code in my Buick at a mechanic or dealership?

- The cost of repairing the B3142 code in a Buick can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is recommended to obtain quotes from multiple sources for an accurate estimate.