B125A 2018 GMC Sierra Code - Antenna Signal Circuit
Quick Answer
The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. Common causes include Faulty Radio Unit, Faulty Coax Cable, Faulty Cellular Phone, Navigation, and Digital Radio Antenna. 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
- B125A 2018 GMC Sierra indicates Antenna Signal Circuit.
- Common causes
- Common causes include Faulty Radio Unit, Faulty Coax Cable, Faulty Cellular Phone, Navigation, and Digital Radio Antenna.
- 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 B125A 2018 GMC Sierra Description
What are the Possible Causes of the DTC B125A 2018 GMC Sierra?
- Faulty Radio Unit
- Faulty Coax Cable
- Faulty Cellular Phone, Navigation, and Digital Radio Antenna
How to Fix the DTC B125A 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
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B125A 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 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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