Is your defective Cadillac CT4 actually a LEMON?

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TSB Document:

Affected Component: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

Summary
This Preliminary information communicates that a service theft deterrent message may display with no DTC's.   OnStar will turn of the ECM read request to prevent re-occurrence.

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Date Published
MAR 12, 2021
NHTSA TSB #
10190398
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