AutoCodes – GMC – B3157 GMC

B3157 GMC 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 GMC 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.

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Code Popularity 404

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

What does this mean?

What are the Possible Causes of the DTC B3157 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 B3157 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 B3157 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 B3157 GMC Code

1. What are the common symptoms of OBDII code B3157 GMC (Right Front Lock Switch Circuit Low)?

The common symptoms include difficulty locking or unlocking the right front door using the switch, malfunctioning power door locks, and potential issues with the right front door lock mechanism.

2. What are the possible causes of OBDII code B3157 GMC?

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

3. How can I diagnose the cause of OBDII code B3157 GMC?

To diagnose the cause of this code, you can start by visually inspecting the wiring and connectors related to the right front door lock switch circuit. Using a multimeter, you can test the continuity of the circuit and check for any voltage irregularities.

4. Can I drive my vehicle with OBDII code B3157 GMC?

While it may be possible to drive your vehicle with this code, it is recommended to address the issue promptly to avoid potential safety concerns and further damage to the door lock system.

5. How can I repair OBDII code B3157 GMC?

Repairing this code may involve replacing the right front door lock switch, repairing or replacing damaged wiring or connectors, replacing the door lock actuator if necessary, or reprogramming the body control module.

6. Is it possible to reset OBDII code B3157 GMC without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the fault code, but it is likely to return if the root cause is not resolved. It is best to diagnose and repair the problem to prevent future issues.

7. Can extreme weather conditions cause OBDII code B3157 GMC to trigger?

Extreme weather conditions can potentially affect the operation of the door lock system and contribute to the triggering of this fault code. Inspect the components for any weather-related damage during diagnosis.

8. Will OBDII code B3157 GMC affect other vehicle systems?

While this code specifically relates to the right front lock switch circuit, it is always recommended to monitor other vehicle systems for any related issues that may arise as a result of the underlying problem.

9. How much does it typically cost to repair OBDII code B3157 GMC?

The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of replacement parts. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.

10. Can OBDII code B3157 GMC be prevented in the future?

Regular maintenance of the door lock system, including keeping the switches clean and ensuring proper operation, can help prevent issues that may trigger this fault code. Addressing any problems promptly can also prevent further complications.