Mercedes Benz will be contacting the owners of certain 2019-2020 AMG G63 and G550 vehicles because they could contain a differential locking module control unit that does not meet the current production specifications.

According to the defect report, a resistor on the board could be affected by the sulfur fumes from the axle oil. If the resistor is impaired, the electrical current could increase and cause communications between the control unit and the locking actuator to be shut down. Both ESP and ABS system would be deactivated, increasing the risk of a crash under certain conditions. Drivers will be alerted of a problem through an illumined ABS and ESP message in the instrument panel.

Dealers will inspect the differential locking modules and replace them as necessary. The NHTSA Campaign Number for this recall is 20V-090.

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