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Posts Tagged: B2580 code

B2580 trouble code GM

Diagnose and fix B2580 code on GM The B2580 code refers to a problem with the vehicle’s lighting systems. Many GM vehicles use a high beam relay to switch on the high beam lights. However, not all systems are the same. If the vehicle has daytime running lights, GM uses the high beams at reduced power to provide the DRL function. To dim the lights, GM uses a pulsing voltage to reduce the amount of current used by the DRL. GM has had plenty of problems with this DRL system … Read More


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