2020 Mercedes-Benz GLS 450 electrical system problems

The engine wiring harness insulation near the ignition coil connectors prematurely deteriorated due to prolonged exposure to engine heat in the turbocharger/exhaust area. Multiple wiring connectors exhibited brittle, cracked insulation with exposed conductors. The degraded wiring began shorting within the ignition system, causing engine misfires, ignition circuit faults, and eventual loss of engine operation.

While driving the vehicle, a series of electrical system warnings were displayed in rapid succession. Shortly thereafter, the vehicle lost power, the engine shut off, and the vehicle began to glide. This incident occurred on a residential street while the vehicle was travelling at 25-30 MPH. The warnings were specific to the 48v electrical system. The vehicle was operable after the incident and it was driven to the dealership. The repair invoice and the warning pictures are attached.