AutoCodes – GMC – B1045 2017 GMC Sierra

B1045 2017 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

Quick Answer

Vehicles without Amplifier: Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one-half of battery voltage. Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier). Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1045 2017 GMC Sierra indicates Left Rear Door Audio Output 3 Circuit.
Common causes: Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier).
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 198

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 12, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1045 2017 GMC Sierra Description

Vehicles without Amplifier:
Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one-half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

Vehicles with Amplifier:
The Media Oriented Systems Transport (MOST) is a high-speed multimedia network technology. The serial MOST bus uses a ring topology and synchronous data communication to transmit audio, video, data and control information between any devices attached.
The audio amplifier is a participant on the MOST network. The audio amplifier receives audio input and control information from the MOST bus.
Each of the audio output channel circuits (+) and (−), at the audio amplifier have a DC bias voltage that is approximately one-half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound.

OBDII Code B1045 2017 GMC Sierra - Left Rear Door Audio Output 3 Circuit - AutoCodes.com — B1045 2017 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

What does this mean?

What are the Possible Causes of the DTC B1045 2017 GMC Sierra?

Faulty Radio Unit
Faulty Audio Amplifier (If equipped)
Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier)
Left Rear Door Speaker (Subwoofer for vehicles with Amplifier) harness is open or shorted
Left Rear Door Speaker (Subwoofer for vehicles with Amplifier) circuit poor electrical connection

How to Fix the DTC B1045 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

B1045:01 Left Rear Door Audio Output 3 Circuit Short to Battery
B1045:02 Left Rear Door Audio Output 3 Circuit Short to Ground
B1045:04 Left Rear Door Audio Output 3 Circuit Open

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1045 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.

Need more information about the B1045 2017 GMC Sierra code?

Need more information on how to fix the B1045 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B1045 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B1045 in a 2017 GMC Sierra related to the Left Rear Door Audio Output 3 Circuit?

The common symptoms include no sound from the left rear door speaker, distorted audio, or complete audio loss from that speaker.

2. What are the possible causes of OBDII code B1045 in a 2017 GMC Sierra?

Possible causes could be a faulty speaker, damaged wiring, a loose connection, or a malfunctioning audio amplifier in the left rear door.

3. How can I diagnose the issue causing OBDII code B1045 in my 2017 GMC Sierra?

You can start by visually inspecting the speaker, wiring, and connections in the left rear door. Using a multimeter to test for continuity and voltage along the audio circuit can help pinpoint the problem.

4. Can I repair OBDII code B1045 in my 2017 GMC Sierra at home?

Repairing this code may require basic automotive electrical knowledge and tools. If the issue is with the speaker or wiring, it can potentially be fixed at home. However, complex audio system problems may need professional diagnosis and repair.

5. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B1045 related to the Left Rear Door Audio Output 3 Circuit?

While the vehicle is safe to drive with this code, it is recommended to address the issue promptly to avoid further damage to the audio system.

6. How much does it typically cost to repair OBDII code B1045 in a 2017 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue. Simple fixes like replacing a speaker or fixing a loose connection may be relatively inexpensive, while more complex problems could be costly.

7. Can resetting the OBDII system clear the B1045 code in my 2017 GMC Sierra?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the B1045 code is not addressed, it is likely to return.

8. Are there any recalls or technical service bulletins related to OBDII code B1045 in a 2017 GMC Sierra?

It's advisable to check with GMC or a certified dealership to see if there are any recalls or technical service bulletins related to this specific OBDII code in your vehicle.

9. Will fixing OBDII code B1045 in my 2017 GMC Sierra require specialized diagnostic equipment?

While basic diagnostic tools like a multimeter can help in diagnosing the issue, some repairs may require specialized diagnostic equipment to troubleshoot the audio system accurately.

10. Can extreme weather conditions affect the occurrence of OBDII code B1045 in a 2017 GMC Sierra?

Extreme weather conditions, such as temperature fluctuations or moisture exposure, can potentially impact the audio components in the vehicle and contribute to issues like the B1045 code.