AutoCodes – GMC – B2558 GMC

B2558 GMC Code - Courtesy Lamp Control Circuit Is Shorted To Voltage

Quick Answer

The courtesy lamps consist of the dome lamp and the rearview mirror reading lamps. Common causes include Faulty Courtesy Lamp, Courtesy Lamp harness is open or shorted, Courtesy Lamp 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: B2558 GMC indicates Courtesy Lamp Control Circuit Is Shorted To Voltage.
Common causes: Common causes include Faulty Courtesy Lamp, Courtesy Lamp harness is open or shorted, Courtesy Lamp 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 939

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 Jan 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2558 GMC Description

The courtesy lamps consist of the dome lamp and the rearview mirror reading lamps. Battery positive voltage for the courtesy lamps is supplied by the Body Control Module (BCM). The BCM controls the courtesy lamps by providing ground to the courtesy lamps low control circuit. If the courtesy lamps low control circuit becomes shorted to voltage, DTC B2558 sets.

OBDII Code B2558 GMC - Courtesy Lamp Control Circuit Is Shorted To Voltage - AutoCodes.com — B2558 GMC Code - Courtesy Lamp Control Circuit Is Shorted To Voltage

What does this mean?

What are the Possible Causes of the DTC B2558 GMC?

Faulty Courtesy Lamp
Courtesy Lamp harness is open or shorted
Courtesy Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2558 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 B2558 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 B2558 GMC Code

1. What are the common symptoms of OBDII code B2558 GMC?

- Common symptoms include the courtesy lamps staying on continuously or not turning off, even when the vehicle is turned off.

2. What could cause the OBDII code B2558 GMC to occur?

- The code B2558 usually occurs when the courtesy lamp control circuit is shorted to voltage, which can be caused by wiring issues or a faulty lamp control module.

3. How can I diagnose the OBDII code B2558 GMC?

- To diagnose the code B2558, you will need a diagnostic scanner to read the code, and then perform a visual inspection of the courtesy lamp wiring and control module for any signs of damage.

4. Can a DIYer repair the OBDII code B2558 GMC?

- Repairing the code B2558 may require advanced electrical knowledge and tools, so it's recommended to consult a professional mechanic for proper diagnosis and repair.

5. Is it safe to continue driving with the OBDII code B2558 GMC?

- While the code B2558 may not affect the vehicle's drivability, it can drain the battery if the courtesy lamps remain on, so it's best to address the issue promptly.

6. How much does it typically cost to repair the OBDII code B2558 GMC?

- The cost of repairing the code B2558 can vary depending on the underlying cause, but it may involve replacing wiring, the lamp control module, or other related components.

7. Are there any temporary fixes for the OBDII code B2558 GMC?

- In some cases, disconnecting the vehicle's battery for a few minutes may reset the system and temporarily resolve the issue, but it's recommended to have the problem properly diagnosed and repaired.

8. Can extreme weather conditions contribute to triggering the OBDII code B2558 GMC?

- Extreme heat or cold can potentially cause wiring issues to become more apparent, which may lead to the code B2558 being triggered due to shorted circuits.

9. Will resetting the OBDII code B2558 GMC make it go away permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue causing the code is not fixed, it is likely to reoccur.

10. How long does it take to repair the OBDII code B2558 GMC?

- The repair time for the code B2558 can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a full day to complete the repair.