0806821

Flash: Body Control Module (BCM) Updates This bulletin involves reprogramming the BCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Codes (DTCs) have been set: P0563-00 - System Voltage High(2020 M6 Vehicles equipped with 2.0L I4 Turbo Diesel Engine W/ESS (Sales Code EBS only)). P21CC?00 - Reductant Control Module Supply Voltage High(2020 M6 Vehicles equipped with (Sales Code EBS only)). P1515-00 - Plausibility Check R1 Stuck Closed Or Vsensing Short To Battery In Engine Running(2019 M6 only). B25C9 - Driver Door Ajar Switch 2 Stuck Closed (Module, Powertrain Control (PCM)). Stored DTC only, this update isnotfor active fault.If B25C9 is an active fault normal diagnostic must be performed. This software update will not correct active DTC. P26E4-64 - Starter Control 2 Circuit-Signal Plausibility Failure. In addition, customers or technicians may comment on one or more of the following:Engine Stop/Start (ESS) not functioning properly(2020 M6 Vehicles equipped with (Sales Code EBS only). Four wheel drive not functioning(2020 M6 Vehicles equipped with (Sales Code EBS only). No start condition if the vehicle has both P1515-00 and P26E4-64 DTCs(2019 M6 only). Park assist LED does not turn on(2019-20 MP/M1 and 2019 M6 only). The key fob does not work for power lift gate (Sales Code JRC)(2019-20 MP/M1 and 2019 M6 only). Vehicle Theft Alarm (VTA) sounding after remote start time out(2019-20 MP/M1 and 2019 M6 only). VTA triggers randomly. The vehicle will not restart when in Engine Stop/Start (ESS) mode. Customers will have to shift into park and cycle the ignition to get the vehicle to start again. The vehicle cranks but fails to start, the customer will see a message on the Instrument Panel Cluster (IPC) "press brake and push ignition button to start" after this happens they must perform a key cycle