B1045 2015 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 2015 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.
Code B1045 2015 GMC Sierra Description
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.
What are the Possible Causes of the DTC B1045 2015 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 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.
Code Tech Notes
B1045:02 Left Rear Door Audio Output 3 Circuit Short to Ground
B1045:04 Left Rear Door Audio Output 3 Circuit Open
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1045 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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Frequently Asked Questions about B1045 2015 GMC Sierra Code
1. What does the OBDII code B1045 mean on a 2015 GMC Sierra?
B1045 indicates an issue with the Left Rear Door Audio Output 3 Circuit, which is responsible for transmitting audio signals to the left rear door speaker.
2. What are common symptoms of the B1045 code in a 2015 GMC Sierra?
Symptoms may include no sound or distorted audio from the left rear door speaker and possible chime or alert malfunctions.
3. What causes the B1045 code to appear?
The code can be caused by a faulty speaker, damaged wiring or connections in the audio circuit, or a malfunctioning amplifier or audio control module.
4. How can I diagnose the B1045 code on my GMC Sierra?
Start by inspecting the left rear door speaker and its wiring for damage. Use a scan tool to read live data and test the circuit’s continuity and resistance.
5. Can a faulty left rear door speaker trigger the B1045 code?
Yes, a damaged or non-functional speaker can disrupt the audio circuit and trigger the B1045 code.
6. Is it safe to drive with the B1045 code active?
Yes, it’s generally safe to drive, but you may experience audio or chime issues that could affect alert notifications.
7. How do I fix the B1045 code in a 2015 GMC Sierra?
Repairs may include replacing the left rear door speaker, repairing damaged wiring, or replacing the amplifier or audio control module if they are faulty.
8. How much does it cost to fix the B1045 code?
Repair costs vary depending on the issue, but replacing a speaker typically costs $50–$150, while wiring or module repairs can range higher.
9. Can resetting the code fix the B1045 issue?
Clearing the code may temporarily erase it, but if the underlying issue isn’t resolved, the code will likely return.
10. Does the B1045 code affect other vehicle systems?
The code primarily affects the audio system, but it may also interfere with audible alerts or warnings reliant on the left rear speaker.
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