Take it an have it check at a qualified repair shop for DTC'S - diagnostic trouble codes . Could have problem with the liftgate/endgate module. Don't try guessing to find a repair .
The keyless entry system has the following main components:
ā¢ The transmitters
ā¢ The endgate module (EGM) (XUV only)
ā¢ The liftgate module (LGM) (Except XUV)
When you press a button on a transmitter, the transmitter sends a signal to the liftgate module. The module interprets the signal and activates the requested function via a class 2 message over the serial data line.
Do you know what class 2 serial data communication network is ?
You need a scan tool to program the remotes .
Program All Key Fobs
To complete this programming operation, all keyless entry transmitters associated with the vehicle must be available for programming. Once placed into program mode, all previously programmed transmitters will be erased from memory upon the receipt of the programming signal from the first transmitter.
Close the lift gate.
Ignition ON, access the scan tool Liftgate Module Setup menu and select Program All Key Fobs.
Follow the the scan tool on screen instructions in order to program the transmitters. Select "Start" on the scan tool to enter the program mode.
As each transmitter is successfully programmed, the scan tool will show how many transmitters have been placed into memory.
When all transmitters are programmed, exit the program mode by selecting "Stop" on the scan tool. The vehicle will not respond to the transmitters until the program mode is exited.
Operate the transmitter functions in order to verify correct system operation.
012 GM Class II Communications
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