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im cam, a licenced diagnostic tech
the wrench light on these means the system has detected vvalues that are out of perimeters and is possible putting it into a limp mode.
oveerboost and difference btween cooling and oil temps are usuallly what cause this wrench light to come on
a code reader will not be able to diagnose this as this is an advanced problem nd will require a advanced dignostic scanner with mode 6 diagnostic on it.i have had this a few times and it was the oil cooler
it might just need a pcm reflash for this as wel if you do not hae a current
sorry, it posted before i was finished
it might just need a pcm reflash for this as well if you do not hae the current software intalled
i would recommend a visit to the dealer for this
if you need any more assistance , id be happy to help
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