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A faulty LCM will not put the car into limp mode.
The chassis mileage is stored in two places, the DME and LCM. If the two are mismatched, then a 'dot' is displayed next to the odometer mileage. If one of the modules are/is replaced, then both must be synchronized. They synchronization process always uses the HIGHEST mileage number for synchronization. This means if you use a previously used module for a replacement, and it has a higher mileage number, the higher number will always be used.
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