AutoCodes – Generic – B258A:04

B258A:04 Code - Low Beam Control Circuit Open

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:04 indicates Low Beam Control Circuit Open.
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 395

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:04 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 short to ground or an open/high resistance in the headlamp low beam relay control circuit.

OBDII Code B258A:04 - Low Beam Control Circuit Open - AutoCodes.com — B258A:04 Code - Low Beam Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC B258A:04?

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:04?

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:04 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 B258A:04 Code

1. What does the OBDII code B258A:04 mean?

The code B258A:04 indicates an open circuit in the low beam control system, meaning the vehicle's control module cannot properly communicate or power the low beam headlights.

2. What are the common symptoms of the B258A:04 code?

Common symptoms include low beam headlights not turning on, flickering, or intermittent functionality, as well as possible warning lights on the dashboard.

3. What causes the B258A:04 code to appear?

Causes may include damaged or frayed wiring, a faulty low beam bulb, a defective headlight switch, or a malfunctioning control module.

4. Can a blown low beam bulb trigger the B258A:04 code?

Yes, a blown or faulty low beam bulb can cause this code, as it disrupts the circuit and prevents proper operation.

5. How do I diagnose the B258A:04 code?

Start by checking the low beam bulb and its socket for damage, inspect the wiring and connectors for corrosion or breaks, and test the headlight switch and control module.

6. Is the B258A:04 code dangerous to drive with?

Yes, driving with this code can be hazardous, especially at night or in poor visibility conditions, as the low beam headlights may not function properly.

7. How do I fix the B258A:04 code?

Repairs may include replacing the low beam bulb, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing a faulty headlight switch or control module.

8. Can the B258A:04 code reset itself?

The code is unlikely to reset itself. It will typically require fixing the underlying issue and clearing the code with an OBDII scanner.

9. How much does it cost to repair the B258A:04 code?

Repair costs vary but could range from $20 for a new bulb to over $300 if a control module or extensive wiring repairs are needed.

10. Can a DIYer fix the B258A:04 code?

Yes, a DIYer with basic tools and knowledge can often fix this code by replacing the bulb or repairing simple wiring issues, but advanced diagnostics may require professional help.