When brakes are applied, the emergency lights stop working. Had a flat tire and pushed the emergency lights and used brakes to slow down and no one was aware that I had an emergency. *Jb
Lights
GMC C4500 Lighting problems by year
2 complaints filed with NHTSA about the GMC C4500's lights. Headlights, tail lights, brake lights, turn signals and interior lighting failures.
Lighting complaints by model year
Latest C4500 lighting complaints
When the vehicle reached a speed of 50 mph, the head lights dimmed. *Jb when the lights are adjusted properly, they do not allow the proper light on the road at speeds greater than 50 mph. Dealer did not see the problem. Scc
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data