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Experiencing loss of power when driving on highway and ses light came on. ses is flashing. 

I figured it was probably a coil pack but, their expensive. I am getting multiple error codes.

PCM p0300 - the unhelpful misfire code

MSM b1850- driver lumbar?

IPC    u1000 - module not communicating?

ABS c1246 brake lining sensor open circuit

PCM p0442 - evaporative emission control system leak  

Any advice would be appreciated.

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How often has this happened?  The coil pack is a good guess, as they are maintenance items, which is to say they do need replacement at some point.  But good to diagnose further first -- do you only get loss of power in certain conditions?

 Most frequent cause of the P0422 is loose fuel cap.


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

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You need a good scanner to isolate what cylinder is misfiring. More that likely its a coil pack but pull the boots and plugs to check .

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