20 Most Recent 2009 GMC Yukon XL - Page 5 Questions & Answers

you are probally working with a bad altenator put a dvom on the batery post and get a voltage reading it should read at 14 volts when vehicle is running if not bad altenator

This could be due to a component in the A/C system malfunctioning and pulling too much amperage. The most likely culprit is the A/C compressor clutch. There could be a short to ground causing a huge amperage spike.

Sounds like a bad connection at the battery post, or at the starter.

In your home electrical panel?

just don't pay the will deactivate service why remove someone else might want it when you sell the vehicular

Vent door may be broke in the closed position,what year and make,model is it.

go to auto parts store and have the codes pulled.

i had a problem like this with my gmc jimmy and all i did was pull the nozzle out a little bit..and it was fine

You may need a shop manual or a repair shop to take a look at it.The alternator has a built in volt regulator, and the regulator is controlled by the computer (PCM). About the only thing you can check without the book is the main battery line to make sure it is not open.Everything else needs the shop manual and a scanner.