AutoCodes – Generic – B3157

B3157 Code - Right Front Lock 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: B3157 indicates Right Front Lock 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.

Save to My Repairs My Repairs

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

Code Popularity 654

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 B3157 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 B3157 - Right Front Lock Switch Circuit Low - AutoCodes.com — B3157 Code - Right Front Lock Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3157?

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 B3157?

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 B3157 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 B3157 code?

Need more information on how to fix the B3157 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3157 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3157 Buick — Right Front Lock Switch Circuit Low
B3157 Cadillac — Right Front Lock Switch Circuit Low
B3157 Chevrolet — Right Front Lock Switch Circuit Low
B3157 GMC — Right Front Lock Switch Circuit Low

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 B3157 Code

1. What does OBDII code B3157 mean?

B3157 indicates a low voltage condition in the right front lock switch circuit, which is part of the vehicle's door lock system.

2. What are the common symptoms of code B3157?

Symptoms may include the right front door lock not responding to commands, intermittent locking/unlocking, or no audible/visual response when using the lock switch.

3. What causes the B3157 code to appear?

Common causes include a faulty door lock switch, damaged wiring or connectors in the circuit, or issues with the body control module (BCM).

4. How is the B3157 code diagnosed?

Diagnosis typically involves inspecting the door lock switch, checking the wiring and connectors for damage or corrosion, and using a multimeter to test for proper voltage and continuity.

5. Can I still drive with code B3157 present?

Yes, you can drive, but the right front door lock may not function properly, which could pose a security risk.

6. How do you fix the B3157 code?

Repairs may include replacing the faulty door lock switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the BCM if necessary.

7. Is the B3157 code specific to one vehicle make or model?

No, B3157 is a generic code, but the specific circuit and repair steps can vary depending on the vehicle make and model.

8. How much does it cost to repair the B3157 code?

Repair costs can range from $50 to $300, depending on whether the issue is a simple wiring fix or requires a new door lock switch or BCM.

9. Can a weak battery trigger the B3157 code?

While unlikely, a weak or failing battery could potentially cause electrical issues affecting the lock circuit, so itâ€™s worth checking.

10. How can I prevent the B3157 code from recurring?

Regularly inspect and maintain the door lock system, ensuring wiring and connectors are clean and free of damage, and address electrical issues promptly.