AutoCodes – GMC – B258A 2015 GMC Sierra

B258A 2015 GMC Sierra Code - Low Beam Control Circuit

Quick Answer

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. Common causes include Blown Low Beam Headlamp Fuse, Low Beam Headlamp Fuse harness is open or shorted, Low Beam Headlamp Fuse 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: B258A 2015 GMC Sierra indicates Low Beam Control Circuit.
Common causes: Common causes include Blown Low Beam Headlamp Fuse, Low Beam Headlamp Fuse harness is open or shorted, Low Beam Headlamp Fuse 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 361

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 May 26, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B258A 2015 GMC Sierra Description

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. The Body Control Module (BCM) responds by applying ground to the low beam relay control circuit which energizes the low beam relay. With the low beam relay energized, the switch contacts close allowing battery voltage to flow through the low beam fuses to the low beam control circuits illuminating the low beam headlamps. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem in the headlamp low beam relay control circuit.

OBDII Code B258A 2015 GMC Sierra - Low Beam Control Circuit - AutoCodes.com — B258A 2015 GMC Sierra Code - Low Beam Control Circuit

What does this mean?

What are the Possible Causes of the DTC B258A 2015 GMC Sierra?

Blown Low Beam Headlamp Fuse
Low Beam Headlamp Fuse harness is open or shorted
Low Beam Headlamp Fuse circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B258A 2015 GMC Sierra?

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 does this mean?

Code Tech Notes

B258A:01 Low Beam Control Circuit Short to Battery
B258A:02 Low Beam Control Circuit Short to Ground
B258A:04 Low Beam Control Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B258A 2015 GMC Sierra 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 B258A 2015 GMC Sierra code?

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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 B258A 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B258A in a 2015 GMC Sierra related to the low beam control circuit?

- The common symptoms include malfunctioning low beam headlights or flickering lights.

2. What are the possible causes of OBDII code B258A in a 2015 GMC Sierra indicating a low beam control circuit issue?

- The code may be triggered due to a faulty headlight control module, damaged wiring, or a defective headlight bulb.

3. How can I diagnose the low beam control circuit problem associated with OBDII code B258A on a 2015 GMC Sierra?

- Use a multimeter to test the continuity of the wiring, check the headlight control module for proper function, and inspect the headlight bulbs for any visible damage.

4. Can a blown fuse cause OBDII code B258A in a 2015 GMC Sierra related to the low beam control circuit?

- Yes, a blown fuse in the headlight circuit can lead to the triggering of the B258A code.

5. Is it safe to continue driving a 2015 GMC Sierra with OBDII code B258A indicating a problem with the low beam control circuit?

- It is not recommended to drive the vehicle with malfunctioning low beam headlights as it may compromise visibility and safety, especially at night.

6. How can I reset the OBDII code B258A in a 2015 GMC Sierra after repairing the low beam control circuit issue?

- You can reset the code using an OBDII scanner by clearing the diagnostic trouble codes stored in the vehicle's computer.

7. Are there any specific repair tips for fixing the low beam control circuit problem associated with OBDII code B258A in a 2015 GMC Sierra?

- Ensure all electrical connections are secure, replace any damaged wiring or components, and use OEM-compatible parts for the repair.

8. Can extreme weather conditions contribute to the occurrence of OBDII code B258A in a 2015 GMC Sierra related to the low beam control circuit?

- Yes, extreme temperatures or moisture exposure can lead to electrical issues affecting the low beam control circuit.

9. Will a disconnected or loose headlight bulb trigger OBDII code B258A in a 2015 GMC Sierra?

- Yes, a disconnected or improperly seated headlight bulb can cause the low beam control circuit problem and trigger the B258A code.

10. Should I seek professional help to diagnose and repair OBDII code B258A in a 2015 GMC Sierra if I am not familiar with automotive electrical systems?

- It is recommended to consult a qualified mechanic or automotive technician for accurate diagnosis and proper repair of the low beam control circuit issue indicated by the B258A code.