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97 T100 Trouble Codes

2155 Views 1 Reply 2 Participants Last post by  Qslim
Hello, have a 97 T100. Got a check engine light, codes show 441 Evap Emissions control system purge flow fault, 440 control system malfunction, 446 control system vent circuit malfunction. What does this mean? Don't know where to start fixing.


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Those three codes together are usually indicative of a loose gas cap. The system is telling you that it can't vent and purge the trapped gasses in the charcoal canister, and all three popping up at the same time means there is a pretty decent sized leak. Check the gas cap, try clearing the code and see if it returns.
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