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The stop lamps on your vehicle are controlled (turned on by the BCM ) - body control module ,turn signal lamps as well . Your vehicle doesn't have a normal brake light switch ,has a low voltage sensor , not to say they can't go bad .
Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.
The first step in the diagnostic process should always be to check for DTC'S - diagnostic trouble code's ,an follow a service diagnostic trouble chart ,testing electrical circuit's .Not listen to someone say it's the brake switch , because in most case's he has no ideal what he's talking about . I have 30 year's GM experience , the level of electronic's on your vehicle , most people just don't have a clue . Your best bet ,take it to a qualified repair shop . That doesn't mean the dealer either . A lot of good independent repair shop's out there .
My first guess would be a ground problem. The bulbs are mounted in plastic sockets and grounded to the car by a black wire. If one socket is not grounded it will try to ground thru a different socket. I would check for voltage and ground on each socket in the back.
hi from uk the fault you have on rear nearside/left lights is a sure sign that you have a poor earth on the left rear lamp assy also check the connection block on the bottom crossmember where the hatch closes on there are pins on the hatch that when closed they contact the block on crossmember so ensure these contacts are clean? the block on x member is removable and lifts out it has plug attached check wires for corrosion? and any sign of o/heating on plug/wires usually caused by poor contacts resulting in arcing /short circuit
if you turn on your right turn indicator and walk around the car you will likely find one of your bulbs are out or that your brake light is out on the right side. if all your indicators flash have someone press the brakes while you check the light.