AutoCodes – GMC – B2545 2015 GMC Sierra

B2545 2015 GMC Sierra Code - Backup Lamps Circuit

Quick Answer

The backup lamp relay is always supplied with battery voltage. Common causes include Blown Backup Lamp Fuse, Faulty Body Control Module (BCM), Body Control Module harness is open or shorted. 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: B2545 2015 GMC Sierra indicates Backup Lamps Circuit.
Common causes: Common causes include Blown Backup Lamp Fuse, Faulty Body Control Module (BCM), Body Control Module harness is open or shorted.
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 213

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 24, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B2545 2015 GMC Sierra Description

The backup lamp relay is always supplied with battery voltage. With the engine running and the transmission in the reverse position, the Transmission Control Module (TCM) sends a serial data message to the Body Control Module (BCM). The message indicates that the gear selector is in the reverse position. The BCM energizes the backup lamp relay by applying battery voltage to the backup lamp relay control circuit. When the backup lamp relay is energized, the relay switch contacts close, and battery voltage is applied through the backup lamp fuses to the backup lamp control circuits which illuminate the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove the battery voltage from the backup lamp relay control circuit. The engine must be running for the backup lamps to operate. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem with the backup lamps relay control circuit.

OBDII Code B2545 2015 GMC Sierra - Backup Lamps Circuit - AutoCodes.com — B2545 2015 GMC Sierra Code - Backup Lamps Circuit

What does this mean?

What are the Possible Causes of the DTC B2545 2015 GMC Sierra?

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

How to Fix the DTC B2545 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

B2545:01 Backup Lamps Circuit Short to Battery
B2545:02 Backup Lamps Circuit Short to Ground
B2545:02 Backup Lamps Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2545 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.

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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 B2545 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B2545 on a 2015 GMC Sierra related to the Backup Lamps Circuit?

The common symptoms include non-functional backup lights, difficulty shifting into reverse, and an illuminated dashboard warning light.

2. What are the possible causes of OBDII code B2545 on a 2015 GMC Sierra?

Possible causes include a faulty backup lamp switch, damaged wiring or connectors in the backup lamp circuit, blown fuses, or a malfunctioning body control module.

3. How can I diagnose the backup lamp circuit issue causing OBDII code B2545 on my 2015 GMC Sierra?

You can diagnose the issue by checking the backup lamp fuse, inspecting the wiring and connectors for any damage, testing the backup lamp switch for proper functionality, and using a diagnostic scanner to read the trouble codes.

4. Can I repair the backup lamp circuit issue causing OBDII code B2545 on my 2015 GMC Sierra myself?

If you have experience working with automotive electrical systems and the necessary tools, you may be able to repair the issue yourself by replacing the faulty backup lamp switch, repairing damaged wiring or connectors, or addressing any other identified problems.

5. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B2545 related to the Backup Lamps Circuit?

It is not recommended to drive the vehicle with non-functional backup lights, as they are essential for signaling your intentions while reversing and ensuring safety for yourself and others on the road.

6. How much does it typically cost to repair the Backup Lamps Circuit issue causing OBDII code B2545 on a 2015 GMC Sierra?

The cost of repairing the Backup Lamps Circuit issue can vary depending on the specific cause of the problem, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the OBDII codes clear the B2545 code related to the Backup Lamps Circuit on my 2015 GMC Sierra?

Resetting the OBDII codes may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear after driving the vehicle for some time.

8. Are there any preventive maintenance tips to avoid encountering OBDII code B2545 on a 2015 GMC Sierra in the future?

Regularly inspecting the backup lamp circuit components, ensuring proper electrical connections, and promptly addressing any issues with the backup lights can help prevent encountering the B2545 code in the future.

9. Can extreme weather conditions or water exposure cause OBDII code B2545 related to the Backup Lamps Circuit on a 2015 GMC Sierra?

Yes, extreme weather conditions or water exposure can potentially lead to damage in the backup lamp circuit components, such as the switch, wiring, or connectors, resulting in the B2545 trouble code.

10. How long does it typically take to diagnose and repair the Backup Lamps Circuit issue causing OBDII code B2545 on a 2015 GMC Sierra?

The time required to diagnose and repair the issue can vary depending on the specific cause and complexity of the problem. It may take a few hours to a full day for a professional technician to complete the diagnosis and repair process.