AutoCodes – Generic – B258A:02

B258A:02 Code - Low Beam Control Circuit Short to Ground

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:02 indicates Low Beam Control Circuit Short to Ground.
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 507

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:02 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:02 - Low Beam Control Circuit Short to Ground - AutoCodes.com — B258A:02 Code - Low Beam Control Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B258A:02?

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:02?

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:02 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:02 Code

What does OBDII code B258A:02 mean?

1. Code B258A:02 indicates a short to ground in the low beam control circuit, which impacts the ability to properly operate the vehicle's low beam headlights. 2.

What are the common symptoms of code B258A:02?

Symptoms include malfunctioning low beam headlights, flickering or dim lights, and possible warning indicators on the dashboard related to lighting systems. 3.

What causes the low beam control circuit to short to ground?

Common causes include damaged wiring, corroded connectors, faulty headlight bulbs, or issues with the low beam relay or control module. 4.

Can I still drive my vehicle with code B258A:02 active?

While the vehicle may be drivable, it is unsafe to drive at night or in low-visibility conditions without functioning low beam headlights. 5.

How do I diagnose the problem behind code B258A:02?

Start by inspecting the wiring and connectors for damage or corrosion. Test the headlight bulbs, relay, and control module for functionality using a multimeter. 6.

Is it expensive to fix code B258A:02?

Repair costs vary depending on the issue. Replacing a damaged wire or bulb is inexpensive, but replacing a control module or extensive wiring repairs may be more costly. 7.

Can a blown fuse cause code B258A:02?

Yes, a blown fuse related to the low beam circuit could cause or be associated with a short to ground issue. 8.

Should I replace the low beam headlight bulbs if I encounter code B258A:02?

Replacing the bulbs is a good first step, especially if they are damaged or burned out, but ensure you also check the wiring and circuit for shorts. 9.

How can I prevent code B258A:02 from occurring?

Regularly inspect the wiring and connectors for damage or corrosion, and promptly replace any faulty components in the headlight system. 10.

Will clearing the code fix the issue permanently?

Clearing the code will not fix the underlying issue. You must repair the short to ground in the low beam control circuit for the problem to be resolved.