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1st thing to try is resetting the push button start
this is usually done by locating the metal portion on the keyfob and hold it in direct contact with the metal ring around the push start button
if this doesn't help then its quite possible the car battery is discharged / flat
so I'd say the next step is to attach a battery charger overnight or for at least 2 hours and then try again to start it
once started you may want to have the battery load tested to see if its faulty and replace accordingly
Also check that the alternator is actually charging the battery in the car by taking a battery voltage reading with the engine off then another with the engine running. The 2nd reading should be higher than the 1st and climbing steadily. And also check that the alternator is secure to the engine as this provides the ground for the charging circuit and make sure that the engine / gearbox earth strap is secure and the contacts are clean and bright.
if the alternator appears not to be working - take it to a electrical specialist and ask them to test it as sometimes you can replace just the diode pack and this will repair the alternator without requiring replacement
OK have you tried what I've suggested?
if its working the dash will spring to life and light up and then the push button work normally
if it snot working then I'd say to try a jump start take great care to ensure the battery cables are connected the correct way round
OK thanks for the extra information
does the engine turn over by hand ?
if it does then its possibly the starter and they can suddenly fail but it's unusual as they normally fail more gradually
if you were to use the jump leads to directly power the starter to see if it will kick over then this will prove this out
however I'd say that its sounding like the push button start may well be faulty
the start module / functionality is common between both the remote and the push button so if the starter module is faulty or the power supply to the module is faulty
sorry to say that I think that the next steps will be to get the car plugged into a dealer level diagnostic tool as this can interface with the start functionality and test it through
Cold conditions can make this sort of thing worse as things contract with temperature, which makes a poor electrical connection worse
however from what you've described and what you've tested I'd say the issue is more of an electronic one
do you still need help?
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