AutoCodes – GMC – B2545 2017 GMC Sierra

B2545 2017 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 2017 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 232

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 2017 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 2017 GMC Sierra - Backup Lamps Circuit - AutoCodes.com — B2545 2017 GMC Sierra Code - Backup Lamps Circuit

What does this mean?

What are the Possible Causes of the DTC B2545 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B2545 on a 2017 GMC Sierra related to the Backup Lamps Circuit?

- The common symptoms include non-functioning backup lights, a dashboard warning light, or issues with the vehicle's reverse gear engagement.

2. What are the possible causes of OBDII code B2545 on a 2017 GMC Sierra affecting the Backup Lamps Circuit?

- Possible causes may include faulty backup lamp bulbs, damaged wiring or connectors, a malfunctioning backup lamp switch, or a problem with the body control module.

3. How can I diagnose OBDII code B2545 on a 2017 GMC Sierra for the Backup Lamps Circuit issue?

- Diagnose the code by checking the backup lamp bulbs, inspecting the wiring and connectors for damage, testing the backup lamp switch, and scanning the body control module for faults.

4. Can I repair OBDII code B2545 on a 2017 GMC Sierra related to the Backup Lamps Circuit myself?

- Depending on your automotive repair skills, you may be able to replace faulty backup lamp bulbs, repair damaged wiring, or swap out a malfunctioning backup lamp switch. However, complex issues may require professional assistance.

5. Are there any safety concerns associated with OBDII code B2545 on a 2017 GMC Sierra impacting the Backup Lamps Circuit?

- Yes, non-functioning backup lights can compromise safety, especially when reversing in low light conditions. It is essential to address this issue promptly to ensure proper visibility and avoid accidents.

6. How can I reset OBDII code B2545 on a 2017 GMC Sierra after repairing the Backup Lamps Circuit problem?

- After fixing the underlying issue, you can reset the OBDII code by using an OBDII scanner or disconnecting the vehicle's battery for a few minutes to clear the stored fault code.

7. Will OBDII code B2545 on a 2017 GMC Sierra impacting the Backup Lamps Circuit cause the vehicle to fail an emissions test?

- The Backup Lamps Circuit issue typically does not affect emissions directly, but it is essential to address the problem to ensure the vehicle's overall safety and functionality.

8. How much does it cost to repair OBDII code B2545 on a 2017 GMC Sierra related to the Backup Lamps Circuit at a professional auto repair shop?

- Repair costs can vary depending on the root cause of the issue, the labor rates of the repair shop, and any replacement parts needed. It is recommended to obtain a detailed quote from a trusted mechanic.

9. Can a faulty backup lamp switch trigger other OBDII codes besides B2545 on a 2017 GMC Sierra?

- Yes, a malfunctioning backup lamp switch can potentially trigger additional codes related to the vehicle's lighting system or electrical components. It is crucial to address the underlying cause promptly to prevent further issues.

10. Is it safe to continue driving a 2017 GMC Sierra with OBDII code B2545 affecting the Backup Lamps Circuit?

- While the vehicle may still be operable, driving with non-functioning backup lights can pose safety risks, especially when reversing. It is advisable to address the problem as soon as possible to ensure safe driving conditions.