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My daughter has a 2003 Cadillac CTS that just started randomly shutting off at a red light, even while driving..when slowing down it will shake and stall. I thought it was the battery or alternator. Both are brand new now and it is still doing it. I told her to go to AutoZone and test it and the only code that showed up was a ? Can someone please help. I tried looking it up online and can't find anything.
Melissa
 

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Not a real code that I have seen nor in the FAQ codes section.Check airand cab filters, oil, transmission fluid, fuel filter, etc. Run a good fuel cleaner through at a half to quarter tank of gas.
 

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Super Moderator 2005 CTS-V
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A ? would seem to indicate that Autozone's code reader wasn't able to sync with the ECM for some reason. Maybe the OBD2 port is not getting power? I'm not sure which fuse feeds the OBD2 port.

Maybe try a different auto parts place - pretty much all the auto parts chains will read codes for free - or hit the dealer.
 
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