Rick's Free Auto Repair Advice

Posts Tagged: GMC Trucks

Turn Signal Problems — GMC/Chevrolet Trucks

Fix Turn Signal Problems — GMC/Chevrolet Trucks Some shops have been reporting repeat Turn Signal Problems with the factory trailer adapter on GM trucks. The symptoms show up as all turn signal lights flashing when you turn left or right and constant power at the trailer harness. The adapter may also cause all ot her kinds of Turn Signal Problems. At first glance you may think to replace the turn signal switch assembly, but check the trailer adapter first. The adapter is located down by the spare tire and is either … Read More

P0446

Fix Trouble code P0446 on GM vehicles GM has issued a TSB (#04-06-0055) for code P0446 on 2000-03 Cadillac, Chevrolet and GMC full size utility trucks. The charcoal canister stores gasoline vapors from the tank. When certain driving conditions are met, the computer supplies power to the purge and vent solenoids. The purge solenoid opens the vacuum line between the canister and the intake manifold and engine vacuum sucks the vapors out of the charcoal. The vent solenoid opens a fresh air line into the canister. If these vehicles are … Read More


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