Car Batteries
GMC Sonoma

I have a 1994 GMC Sonoma SLE v6 W engine and automatic trans Under the battery is what appears to be a vacuum switch. If it was bad could it cause me to loose reverse and slip in other gears?

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Wiki User
08/06/2008

I would have to say probably not. That switch is probably part of the emission system. So the chances of the switch is probably less than 5%. The problems you are having are in the transmission itself. When was the last time you changed or checked the fluid? The transmission should be serviced. This is a vacuum switch that controls the 4 wheel drive it has nothing to do with the transmission