PO440
#1
PO440
2001 GMC Sierra Z71 1500 HD 5.3l.
every few weeks or so my check engine light comes on, I've had it scanned with the code PO440. This is an evap code that seems not be going away. I've been told it could be a bad gas cap, what else could it be? and has anyone had this problem before, if so what did you do to fix?
Thanks
every few weeks or so my check engine light comes on, I've had it scanned with the code PO440. This is an evap code that seems not be going away. I've been told it could be a bad gas cap, what else could it be? and has anyone had this problem before, if so what did you do to fix?
Thanks