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'02 ETC CE, '04 CTS-V, '04 XLR, '13 XTS Platinum
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If the CEL illuminates, a fault code (DTC) will be stored in memory for a specific number of ignition cycles (if the fault clears.) Just because the CEL may not have been illuminated when the tech looked at it, doesn't mean he couldn't have read the DTC. I would speak to the Service Manager or as previously mentioned, or find a new dealer if it's convenient.

CCC
 
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