Why is the keyless entry not working on the Buick Regal?

[LaGraham]

Buick Regal keyless entry not working reasons are as follows: 1. Fault diagnosis: After GDS detection, there is a fault code B3119 in the keyless entry control module, indicating that keyless entry antenna 1 has high voltage or is open circuit. The reasons for this fault code include corresponding circuit breakage or open circuit, antenna damage, keyless entry module failure, etc. Press the switch on the left front door handle and observe this data with GOS as inactive (it should normally show active). Press the switch on the left rear door handle, and this data shows as active and normal. 2. Working principle: When the door handle button or trunk touchpad is pressed, the low-frequency antenna sends a verification command to the keyless entry transmitter. Due to the low frequency, the communication range is limited. The antenna will send the verification command within a 1m range, and the transmitter must be within this range to receive the verification command. The transmitter receives this verification command and sends a radio frequency response message, which will be received by the remote door lock receiver. If the response is correct, entry to the vehicle is allowed.

[McRebecca]

Last time my car had this issue too, took me a while to figure it out. The most common cause is a dead remote key fob battery—just replace it with a new one and you're good to go. If the key light is on but the door still doesn't respond, it might be due to low vehicle battery voltage, in which case you'll need a jump start. Also check the door handle sensor; dust or debris blocking it can cause failure—just wipe it clean. Environmental factors like proximity to phones or Wi-Fi devices can cause strong signal interference, so step away and try again. If none of these work, don't force it—it could be a system software bug requiring a 4S店 reset and reprogram. For safety, always carry a spare key when you're out.

[SanGrant]

I've studied automotive electronic systems, and keyless function failures are often related to signal transmission issues. When the coin cell battery inside the key fob ages and loses sufficient power, its transmission strength weakens, causing the vehicle to fail receiving commands. Alternatively, interference with the vehicle's antenna position or nearby strong electromagnetic sources can more easily trigger failures. Simple troubleshooting steps: first check if the key fob buttons show red light blinking; then try unlocking by approaching the driver's side door handle. Also consult the vehicle manual, as some models require regular software updates for optimization. If unresponsiveness persists, check for poor contact in the door control module wiring - these are relatively easy to fix. In critical moments, use the mechanical key to open the door.

[VonJessica]

If the keyless entry suddenly fails, I always prioritize safety risks. Don't park in dangerous areas, quickly use the mechanical key to open and start the vehicle, then check the key's battery status—new batteries are very cheap. Temperature changes may affect sensor sensitivity, try changing positions and testing a few times. In case of internal wiring short circuits or blown fuses, professional diagnostic tools are needed for inspection. Remember to routinely check the keyless system during maintenance to avoid getting stranded at night.

[Phoebe]

My Buick Regal malfunctioned after being exposed to rain, and it turned out to be due to water ingress in the door handle sensor. It returned to normal after cleaning and drying. The lesson is not to rely solely on a single function; always keep a mechanical key handy for emergencies. Additionally, when the car battery is dead, it can indirectly affect signal reception. Usually, jump-starting and restarting the system resolves the issue. A friend's car experienced a similar situation in a weak signal area of a parking lot, and moving the car to an open space fixed it. This reminds me to pay attention to daily maintenance.