B1025 2018 GMC Sierra Code - Left Front Door Audio Output 1 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 Front Door Speaker. 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
- B1025 2018 GMC Sierra indicates Left Front Door Audio Output 1 Circuit.
- Common causes
- Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Left Front Door Speaker.
- 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 B1025 2018 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 B1025 2018 GMC Sierra?
- Faulty Radio Unit
- Faulty Audio Amplifier (If equipped)
- Faulty Left Front Door Speaker
- Left Front Door Speaker harness is open or shorted
- Left Front Door Speaker circuit poor electrical connection
How to Fix the DTC B1025 2018 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
B1025:02 Left Front Door Audio Output 1 Circuit Short to Ground
B1025:04 Left Front Door Audio Output 1 Circuit Open
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1025 2018 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 B1025 2018 GMC Sierra Code
1. What does the OBDII code B1025 mean on a 2018 GMC Sierra?
B1025 indicates an issue with the "Left Front Door Audio Output 1 Circuit," meaning there is a problem with the audio signal to the left front door speaker.
2. What are the common symptoms of the B1025 code in a GMC Sierra?
Symptoms include no sound or distorted sound from the left front door speaker, potential static noise, or the speaker cutting in and out.
3. What causes the B1025 code on a 2018 GMC Sierra?
Common causes include a faulty left front door speaker, damaged wiring or connectors, or a malfunctioning audio amplifier.
4. Can a blown speaker cause the B1025 code?
Yes, a blown or damaged speaker in the left front door can trigger the B1025 code, as it disrupts the audio circuit.
5. How can I diagnose the B1025 code on my 2018 GMC Sierra?
Start by inspecting the left front door speaker, checking the wiring and connectors for damage or loose connections. If no issues are found, test the audio amplifier and speaker output.
6. Can I drive my 2018 GMC Sierra with a B1025 code?
Yes, the B1025 code does not affect drivability, but it may impair audio functionality in the vehicle.
7. How do I fix the B1025 code on a GMC Sierra?
Repairs may include replacing the left front door speaker, repairing or replacing damaged wiring, or replacing the audio amplifier if it is defective.
8. How much does it cost to fix the B1025 code on a 2018 GMC Sierra?
The cost varies depending on the issue. Replacing a speaker may cost $50 to $200, while repairing wiring or replacing the audio amplifier may range from $100 to $500 or more.
9. Can a software issue cause the B1025 code?
While rare, a software glitch in the audio control module could cause the code. Updating or reprogramming the module may resolve the issue.
10. Do I need special tools to fix the B1025 code on my GMC Sierra?
Basic tools like a multimeter can help test wiring and speakers. In some cases, a professional diagnostic scanner may be needed to pinpoint the problem.
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