p0449 & p0442 codes on 2007 Chevrolet Silverado 1500

how do you test the EECS vent/solenoid for the circuit malfunction and where is it located

by in Denton, MD on July 29, 2010
1 answer
ANSWER by , July 29, 2010
you need a smoke machine and a scanner. you activate the soloniod from the scanner and watch the smoke from the vent line. better having a shop check it. Roy