If your Envoy brake lights stopped working along with the trailer's brake lights and you know the vehicle brake circuit fuses are good then the issue is likely to be related to the connector for your wiring harness.
The 4-pole and 7-way harnesses for your Envoy, such as # C55384 and # 74682, use a round U.S. Car type connector to join the vehicle wiring. There could be trapped moisture, foreign material, corrosion or a bent pin that is causing loss of the brake light signal. Bad corrosion... view full answer...
It sounds like your Tekonsha Prodigy P2 Trailer Brake Controller # 90885 may have its red trigger wire connected to the wrong wire at your brake light switch.
This red wire should connect to the wire on the Envoy's brake light switch that carries power only when you press the pedal. There are other wires at the brake light switch that will carry power all the time and it is easy to accidentally connect the wrong one.
The best way to find the correct vehicle wire to connect to the red... view full answer...
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