GMC K1500 rear turn signals and brake lamps inoperative due to potential circuit board failure on GMC K1500

Some GMC K1500 owners report experiencing issues with rear turn signals and brake lamps not functioning, which may be attributed to potential circuit board failures. These owners note that the rear turn signals also serve as brake lights, and if the brake lights work intermittently, it could signal a problem within the rear lamp assembly's circuit board. Additionally, some drivers observe that if their turn signals are flashing faster than normal, it may indicate burned-out bulbs in the front turn signals. It is crucial for owners to check the wiring harness for pinched wires and exposed connections, as faulty wiring can lead to rear light issues. Testing the turn signal wire at the rear brake light with a test light can help determine if the switch is operational. Moreover, the center high mount stop lamp and rear brake lamps are usually controlled by the same circuit, driven by the brake light feed. Therefore, inspecting these components is essential for effectively diagnosing and resolving the problem.