The GM Service Guy

A rhythmic clicking or ticking from behind the dash, and air temperature that won't respond to your settings? That's the classic blend door actuator failure.

Sudden, unexplained electrical gremlins after your vehicle sat parked for a while? Rodent damage to the wiring harness is more common than most owners realize.

Blurry, black, delayed, or missing backup camera image? Here's how to work through the most common causes and when it's worth a camera upgrade.

Random dash lights, doors that lock themselves, or accessories that stop responding for no clear reason? The body control module may be the common thread.

One door not locking with the rest, or a clicking sound from inside the door? Here's how to diagnose and fix a failing door lock actuator.

Window moving slowly, crooked, or not at all? Here's how to tell whether it's the regulator, the motor, or something simpler.

Turn the key and get a click, silence, or nothing at all — but only sometimes? Here's how to tell starter motor failure apart from a battery or fuel problem.

Dimming lights, a battery warning light, or a dead battery that keeps coming back? Here's how to tell if your alternator is the problem.