t-code 440 98 gmc sierra 4.3


Old 05-10-04, 03:01 PM
reyes45's Avatar
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Join Date: Mar 2003
Location: Michigan, USA
Posts: 71
t-code 440 98 gmc sierra 4.3

Hi Guys,
Today my truck`s check engine light turned . I scanned the computer and it registered code 440. My question is , what could have caused this code and whet should i start checking first. Thanks in advance.
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Old 05-10-04, 05:10 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
Not sure what you mean by "t" code. Is this a PO440?. If that's what it is you may have just left the gas cap loose. It's pretty common. It could mean another problem with the evap sytem too. The definition is "Evaporative Emmision Control System Malfunction" That's pretty broad but a loose gas cap will set it.
Old 05-10-04, 06:19 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
Do you drive off road alot or on gravel roads?Let me know then we know what path to follow.

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