1999 Chevrolet Blazer • 175,157 miles

My 1999 Chevrolet blazer 4wd. 4dr. 4.3l vehicle has code po452(evaporative emission system control sensor). Can it be checked without dropping the fuel tank? I have read online from another person's post that this could cause automatic transmission to not shift properly while driving. Is this all true?
October 11, 2013.

This needs to be checked by a pro it doesn t effect your transmission but says vacuum isn't reading right in fuel tank. It cold be a bad vehicle control module or a short. But those are vin specific an dhave t be programmed into your vehicle. But it needs to be checked to see if pressure sensor is getting voltage and not a connection or wiring problem like a shorted wire.

Oct 11, 2013.