Technical Service Bulletins

Rear Diff Flash

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Rear Diff Flash

Some owners of 2014-2018 Corvettes may comment about a Service Rear Differential message displayed on the DIC (driver information center).

The technician may find DTC C0407 set. This condition may be caused by a software anomaly in the Rear Differential Clutch Control Module (RDCCM). The RDCCM must be updated to the latest software calibrations.

Stable battery voltage is critical during programming. Install the EL-49642 SPS Programming Support Tool #PSC-550 to maintain system voltage.

If not available, connect a fully charged 12V jumper or booster pack that is disconnected from an AC voltage supply. Do NOT connect to a battery charger.

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