B1045 2014 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 2014 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 2014 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 2014 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 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.
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 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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Frequently Asked Questions about B1045 2014 GMC Sierra Code
1. What does the OBDII code B1045 mean on a 2014 GMC Sierra?
B1045 indicates an issue with the Left Rear Door Audio Output 3 Circuit, which affects the audio signal sent to the left rear door speaker.
2. What are the symptoms of code B1045 in a 2014 GMC Sierra?
Symptoms may include no sound or distorted audio from the left rear door speaker, or intermittent speaker function.
3. What causes the B1045 code to appear on a 2014 GMC Sierra?
Common causes include a faulty speaker, damaged wiring or connectors in the left rear door audio circuit, or a malfunctioning radio or audio amplifier.
4. How can I diagnose the B1045 code on my 2014 GMC Sierra?
Start by inspecting the speaker, wiring, and connectors for damage or corrosion. Use a multimeter to test for continuity and proper voltage in the circuit.
5. Can a blown speaker cause the B1045 code in a 2014 GMC Sierra?
Yes, a blown or faulty left rear door speaker can trigger the B1045 code due to an open or shorted circuit.
6. How do you fix the B1045 code on a 2014 GMC Sierra?
Repairs may include replacing the left rear door speaker, repairing or replacing damaged wiring, or reprogramming or replacing the radio or audio amplifier if needed.
7. Is the B1045 code serious in a 2014 GMC Sierra?
While it does not affect vehicle drivability, it can impact audio quality and should be addressed to maintain proper function of the sound system.
8. Can I still drive my 2014 GMC Sierra with a B1045 code?
Yes, you can drive the vehicle, but the left rear door speaker may not function correctly, which could impact your enjoyment of the audio system.
9. How much does it cost to fix the B1045 code on a 2014 GMC Sierra?
Repair costs vary depending on the issue. Replacing a speaker might cost around $50-$200, while wiring repairs or amplifier replacements could be more expensive.
10. Can a software update fix the B1045 code in a 2014 GMC Sierra?
In some cases, reprogramming the audio system or performing a software update may resolve the issue if it’s related to a system glitch.
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