AutoCodes – GMC – B2545 2016 GMC Sierra

B2545 2016 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 2016 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 182

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 2016 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 2016 GMC Sierra - Backup Lamps Circuit - AutoCodes.com — B2545 2016 GMC Sierra Code - Backup Lamps Circuit

What does this mean?

What are the Possible Causes of the DTC B2545 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B2545 in a 2016 GMC Sierra related to the Backup Lamps Circuit?

The common symptoms include non-functioning backup lights, intermittent operation of the backup lights, or the backup lights staying on constantly.

2. What are the possible causes of OBDII code B2545 in a 2016 GMC Sierra?

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

3. How can I diagnose the issue causing OBDII code B2545 in my 2016 GMC Sierra?

You can start by checking the fuse for the backup lamp circuit, inspecting the wiring and connectors for any damage, testing the backup lamp switch for proper operation, and using a diagnostic scanner to retrieve trouble codes from the body control module.

4. Can I repair OBDII code B2545 in my 2016 GMC Sierra myself?

Depending on your skill level and access to tools, you may be able to repair the issue yourself by replacing the faulty backup lamp switch, repairing damaged wiring or connectors, or resetting the body control module. However, if you are unsure, it is recommended to consult a professional mechanic.

5. Is it safe to continue driving my 2016 GMC Sierra with OBDII code B2545 triggered?

It is not recommended to drive your vehicle with OBDII code B2545 active, as non-functioning backup lights can pose a safety hazard, especially when reversing in low-light conditions. It is best to address the issue promptly.

6. Will resetting the OBDII code B2545 in my 2016 GMC Sierra make the problem go away?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing OBDII code B2545. It is important to diagnose and repair the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code B2545 in a 2016 GMC Sierra at a dealership or repair shop?

The cost of repairing OBDII code B2545 can vary depending on the exact cause of the issue and the labor rates of the dealership or repair shop. It is advisable to get a diagnosis and cost estimate before proceeding with the repair.

8. Can extreme weather conditions affect the Backup Lamps Circuit and trigger OBDII code B2545 in a 2016 GMC Sierra?

Yes, extreme weather conditions such as moisture, corrosion, or temperature fluctuations can potentially damage the wiring or connectors in the Backup Lamps Circuit, leading to the triggering of OBDII code B2545.

9. Are there any preventive maintenance tips to avoid encountering OBDII code B2545 in a 2016 GMC Sierra?

Regularly inspecting the backup lights for proper operation, checking the fuse for the backup lamp circuit, and keeping the wiring and connectors clean and free of corrosion can help prevent issues that may trigger OBDII code B2545.

10. Can a dashboard warning light be illuminated due to OBDII code B2545 in a 2016 GMC Sierra?

Yes, OBDII code B2545 can trigger the check engine light or a specific warning light related to the backup lamps circuit on the dashboard of a 2016 GMC Sierra, indicating a malfunction that needs to be addressed.