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codes are OBDll and available on line free..google P0496 code.
Can a loose gas cap cause code P0496?
Check the Gas Cap
The first thing you should check whenever your car has a P0496 code is your gas cap-make sure it's not loose because a loose gas cap can trigger a P0496.l
This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system
the p0496 means that the evap system flow during non-purge first check ur gas cap this can cause the check engine code if cap is good and on tight than the usual culprit is either evap purge solenoid and or canister vent solenoid sticking not expensive to replace by self in driveway but before u do check with a dealer in area and advise about code to see if covered should be since its an 08 evap should be covered [dont know mileage and or condition of truck which makes a difference on warranty ]
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