B1045 GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1045 GMC 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 GMC code?
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Information for Specific GMC Models
- B1045 2014 GMC Sierra — Left Rear Door Audio Output 3 Circuit
- B1045 2015 GMC Sierra — Left Rear Door Audio Output 3 Circuit
- B1045 2016 GMC Sierra — Left Rear Door Audio Output 3 Circuit
- B1045 2017 GMC Sierra — Left Rear Door Audio Output 3 Circuit
- B1045 2018 GMC Sierra — Left Rear Door Audio Output 3 Circuit
Frequently Asked Questions about B1045 GMC Code
1. What are the common symptoms of OBDII code B1045 GMC?
The common symptoms of code B1045 GMC include no sound from the left rear door speaker, distorted audio output, or complete audio failure.
2. What can cause the OBDII code B1045 GMC to trigger?
The B1045 code is typically triggered by a malfunction in the audio output circuit of the left rear door speaker in a GMC vehicle.
3. How can I diagnose the issue related to code B1045 GMC?
To diagnose the issue, you can start by checking the wiring connections, fuses, and the speaker itself for any visible damage or loose connections.
4. What repair tips can help fix OBDII code B1045 GMC?
Repair tips for resolving code B1045 GMC may include repairing or replacing damaged wiring, checking and replacing fuses, and ensuring proper connections to the left rear door speaker.
5. Is it safe to continue driving with OBDII code B1045 GMC unresolved?
It is generally safe to continue driving with code B1045 GMC, as it primarily affects the audio output of the left rear door speaker and does not pose a significant safety risk.
6. Can I reset the OBDII code B1045 GMC on my own?
You can reset the B1045 code using an OBDII scanner or by disconnecting the car battery for a few minutes. However, it is recommended to diagnose and fix the underlying issue first.
7. Do I need to visit a mechanic for OBDII code B1045 GMC repair?
While you can attempt to diagnose and repair code B1045 GMC on your own, seeking help from a certified mechanic may be beneficial for a more accurate diagnosis and proper repair.
8. How much does it typically cost to repair OBDII code B1045 GMC?
The cost of repairing code B1045 GMC can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different repair shops.
9. Are there any common causes for OBDII code B1045 GMC other than wiring issues?
Apart from wiring issues, common causes of code B1045 GMC may include a faulty speaker, a blown fuse, or a malfunctioning audio unit in the vehicle.
10. Is there a way to prevent OBDII code B1045 GMC from occurring in the future?
Regular maintenance checks, avoiding water damage to the vehicle's audio components, and ensuring proper wiring connections can help prevent the recurrence of code B1045 GMC in the future.
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