I have a 2004 Tahoe, 4.8L with approximately 66,000 miles currently.
About 2 months and 2000 miles ago the check engine light came on.
Went to my local AutoZone shop and rented a OBD-II sensor. The
code that came up was P0442- a quick reference to my Hanes manual
read "EVAP System, small leak detected."
The clerk told me that most likely the leak was coming from my gas
tank cap- either I didn't tighten it down all the way or the rubber seals
on the gas cap were going bad.
Just to give you a quick reference at around 20,000 miles I changed the original gas cap with a locking unit from the dealer.
I wanted to make sure that it wasn't the gas cap that was bad
before I dropped another $35 so I cleared the check engine light
and decided to wait to see if it came up again.
Fast forward to 2 weeks ago and 2000 miles later- the check engine
light comes on again. This time I figured I would just go ahead and
replace the gas cap so I went to my local dealer and got another one.
As a side note, the sales guy told me that GM made two different
versions of the locking gas cap depending on the application. I made
sure that the one he sold me was the correct unit for my vehicle.
Funny thing is when I compared it to the one I originally replaced at
20,000 miles I discovered that it was different from the one I bought?
There is something on the groves of the gas cap (sorta like a triangle
shape design) that makes it different...
Well, today the check engine light came back on. I'm getting a bit
frustrated at this point. Anyone got any ideas? Thanks in advance!
About 2 months and 2000 miles ago the check engine light came on.
Went to my local AutoZone shop and rented a OBD-II sensor. The
code that came up was P0442- a quick reference to my Hanes manual
read "EVAP System, small leak detected."
The clerk told me that most likely the leak was coming from my gas
tank cap- either I didn't tighten it down all the way or the rubber seals
on the gas cap were going bad.
Just to give you a quick reference at around 20,000 miles I changed the original gas cap with a locking unit from the dealer.
I wanted to make sure that it wasn't the gas cap that was bad
before I dropped another $35 so I cleared the check engine light
and decided to wait to see if it came up again.
Fast forward to 2 weeks ago and 2000 miles later- the check engine
light comes on again. This time I figured I would just go ahead and
replace the gas cap so I went to my local dealer and got another one.
As a side note, the sales guy told me that GM made two different
versions of the locking gas cap depending on the application. I made
sure that the one he sold me was the correct unit for my vehicle.
Funny thing is when I compared it to the one I originally replaced at
20,000 miles I discovered that it was different from the one I bought?
There is something on the groves of the gas cap (sorta like a triangle
shape design) that makes it different...
Well, today the check engine light came back on. I'm getting a bit
frustrated at this point. Anyone got any ideas? Thanks in advance!
