Would a Vacuum Leak at the HVAC Controls Cause a P0101?
#1
Would a Vacuum Leak at the HVAC Controls Cause a P0101?
I bought a 2003 Blazer around 2 1/2 weeks ago, and before even getting a chance to register it the SES light came on and it was a P0101 code. I cleaned the MAF, but a day later the code came back. Since the truck would obviously not pass emissions with the SES light on, I took it back to the dealer. They replaced the MAF sensor for free and the light didn't come back on, until today. Same P0101 code. Obviously they didn't diagnose and repair it correctly. Later on today I'm going to call them and see if they'll fix it right. In the meantime, I figured I'd try to find out what the problem is for myself. I think that there is a vacuum leak at the HVAC control. There is a hissing noise coming from the dashboard that stops when you put the vent selector **** to off. From reading here I know that a vacuum leak can cause this code, since the amount of air that is entering the intake doesn't match what the MAF sensor is reading. Would a leak that far from the intake cause this code? Thanks.
#3
Follow the steps in this flow chart exactly as written, and it will take you right to the problem. https://blazerforum.com/forum/diagno...plained-31561/
#4
Edit: Thanks Captain, I started to follow the chart the first time the light came on (before the shop replaced the MAF). I'll redo it again. I was just trying to see if the HVAC leak was related to this issue.
Last edited by porkfriedrice; 12-07-2012 at 03:09 PM.
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