AutoCodes – GMC – B2545 2014 GMC Sierra

B2545 2014 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 2014 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 275

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 2014 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 2014 GMC Sierra - Backup Lamps Circuit - AutoCodes.com — B2545 2014 GMC Sierra Code - Backup Lamps Circuit

What does this mean?

What are the Possible Causes of the DTC B2545 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What does the OBDII code B2545 mean on a 2014 GMC Sierra?

The B2545 code indicates an issue with the Backup Lamps Circuit, which could involve wiring, connectors, or the backup lamp switch.

2. What are the common symptoms of code B2545 in a 2014 GMC Sierra?

The most common symptoms include non-functioning backup lights, dim or flickering backup lights, or the illumination of the check engine or warning light.

3. What causes the B2545 code in a 2014 GMC Sierra?

Common causes include a faulty backup lamp switch, damaged wiring or connectors, a blown fuse, or a malfunctioning Body Control Module (BCM).

4. Can a blown fuse trigger the B2545 code?

Yes, a blown fuse in the circuit can prevent voltage from reaching the backup lamps, triggering the B2545 code.

5. How do I troubleshoot the B2545 code on my 2014 GMC Sierra?

Start by checking the backup lamp fuse, inspecting the wiring and connectors for damage, and testing the backup lamp switch for proper functionality.

6. Can a faulty backup lamp bulb cause the B2545 code?

No, a faulty bulb typically wouldnâ€™t trigger this code, as the code relates to the circuit's electrical integrity rather than bulb failure.

7. How is the B2545 code fixed on a 2014 GMC Sierra?

Fixes may include replacing a faulty backup lamp switch, repairing damaged wiring or connectors, replacing a blown fuse, or reprogramming the BCM if necessary.

8. Is it safe to drive with the B2545 code on my 2014 GMC Sierra?

Yes, it is generally safe to drive, but the backup lamps may not function, which can pose safety concerns when reversing.

9. Can a bad Body Control Module (BCM) cause the B2545 code?

Yes, a malfunctioning BCM can disrupt the backup lamps circuit and trigger the B2545 code, though this is less common.

10. How much does it typically cost to fix the B2545 code on a 2014 GMC Sierra?

Repair costs vary but typically range from $50 to $300, depending on whether the issue involves a simple fuse replacement or more complex wiring or module repairs.