t-code 440 98 gmc sierra 4.3

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  #1  
Old 05-10-04, 03:01 PM
reyes45's Avatar
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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
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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.
 
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Old 05-10-04, 06:19 PM
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Do you drive off road alot or on gravel roads?Let me know then we know what path to follow.
 
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