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Engine-Codes – GMC – B125A 2018 GMC Sierra

B125A 2018 GMC Sierra Code - Antenna Signal Circuit

Quick Answer

The B125A code for a 2018 GMC Sierra specifically refers to an issue with the Antenna Signal Circuit. Common causes include Damaged or disconnected antenna cable, Faulty antenna module, Short circuit in the wiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B125A 2018 GMC Sierra indicates Antenna Signal Circuit.
Common causes
Common causes include Damaged or disconnected antenna cable, Faulty antenna module, Short circuit in the wiring.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B125A 2018 GMC Sierra Description

The B125A code for a 2018 GMC Sierra specifically refers to an issue with the Antenna Signal Circuit. This code indicates that there is a malfunction or disruption in the circuit that controls the antenna signal in the vehicle. The antenna signal circuit is crucial for receiving radio signals, GPS signals, and other wireless communications in the vehicle. When this circuit is compromised, it can lead to a loss of signal reception, resulting in poor radio reception, navigation system malfunctions, and other communication issues.

OBDII Code B125A 2018 GMC Sierra - Antenna Signal Circuit
B125A 2018 GMC Sierra Code - Antenna Signal Circuit

Common Causes of B125A 2018 GMC Sierra

  1. Damaged or disconnected antenna cable.
  2. Faulty antenna module.
  3. Short circuit in the wiring.
  4. Problem with the antenna amplifier.
  5. Corrosion or damage to antenna components.

Symptoms of B125A 2018 GMC Sierra

  1. Poor radio reception or complete loss of radio signal.
  2. GPS navigation system not functioning properly or unable to acquire satellite signals.
  3. Bluetooth connectivity issues, such as difficulty pairing devices or dropped calls.
  4. Tire pressure monitoring system showing error messages due to loss of signal.
  5. Warning light on the dashboard related to the communication system.

How to Fix B125A 2018 GMC Sierra

  1. Begin by inspecting the antenna system components, including the cable, module, wiring, and amplifier, for any visible damage or loose connections.
  2. Test the continuity of the antenna circuit using a multimeter to identify any short circuits or breaks in the wiring.
  3. Replace any damaged components, such as the antenna cable or module, with OEM parts to restore the antenna signal circuit's functionality.
  4. Clear the diagnostic trouble code using a scan tool after completing the repairs and test the vehicle to ensure that the antenna signal is restored.
  5. Perform a final check of all communication systems that rely on the antenna signal to confirm proper functionality.

Cost to Fix B125A 2018 GMC Sierra

The typical repair costs for addressing the B125A code related to the Antenna Signal Circuit in a 2018 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for B125A 2018 GMC Sierra

B125A:04 Antenna Signal Circuit Short to Battery

B125A:02 Antenna Signal Circuit Short to Ground

B125A:04 Antenna Signal Circuit Open



Poor AM and FM radio reception may be due to multiple influences, some of which may not be vehicle related. Areas that have high RF traffic or block the signal path may cause a degradation in radio reception. Radio reception may also be influenced by items within the vehicle, but not part of the radio system. Such examples are aftermarket electrical accessories or other items which may generate noise in the vehicle's electrical system. Aftermarket window tinting, especially when there is metallic in the film, may reduce radio reception.

AM reception is highly dependent on the antenna amplifier receiving battery voltage from the radio and being properly grounded. The antenna base has a built-in antenna amplifier that boosts both AM and FM reception. When the antenna amplifier does not receive power, AM stations may not be received, and FM reception will be limited. If the antenna base is not properly grounded, excessive interference in the signal may occur or reception may be limited.

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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 B125A 2018 GMC Sierra Code

1. What does the OBDII code B125A mean on a 2018 GMC Sierra?

The code B125A indicates an issue with the antenna signal circuit, which may affect the vehicle's radio or communication systems.

2. What are the common symptoms of the B125A code on a 2018 GMC Sierra?

Symptoms can include weak or no radio reception, static interference, or the inability to tune stations properly.

3. What causes the B125A code to appear in a 2018 GMC Sierra?

Common causes include a damaged or disconnected antenna, faulty antenna wiring, or a malfunctioning antenna module.

4. Can a bad radio head unit trigger the B125A code?

Yes, a malfunctioning radio head unit or its internal circuitry can also cause this code to appear.

5. How do you diagnose the B125A code on a 2018 GMC Sierra?

Diagnosis involves checking the antenna, inspecting wiring for damage or disconnections, and testing the antenna module with a scan tool.

6. Can the B125A code affect other systems in the 2018 GMC Sierra?

While primarily related to the radio, it may also impact Bluetooth, GPS, or OnStar functionality if they rely on the same antenna system.

7. How is the B125A code typically fixed?

Repairs may involve repairing or replacing antenna wiring, reconnecting the antenna, or replacing the antenna module.

8. Is it safe to drive with the B125A code on a 2018 GMC Sierra?

Yes, it is generally safe to drive, but you may experience limited radio or communication functionality.

9. Does clearing the B125A code with a scan tool fix the problem?

Clearing the code will not fix the underlying issue; proper diagnosis and repair must be performed first.

10. What tools are needed to repair the B125A code on a 2018 GMC Sierra?

You may need a multimeter, a scan tool capable of reading GMC-specific codes, and basic hand tools to inspect and repair the antenna system.

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