Software Update for Engine Control Unit
A software update is available for the Engine Control Unit (address 01) to address issues with DTC U0146.
Important Notes
The self-healing procedure may not perform as required if DTC U0146 is present. The update procedure will automatically erase the DTC.
A suitable battery charger must be connected to the vehicle to ensure a closed-circuit voltage of at least 12.5 V during the update.
All unnecessary consumers (e.g., ventilation, seat heater, interior illumination) must be switched off during the update.
The diagnosis interface VAS 6154 (WiFi diagnostic tool) or VAS 5055 (cable-connected) must be used in USB operation for reprogramming.
Adaption Drive Procedure
An open road is required for the adaption drive, which must be performed in manual gear.
The vehicle must be accelerated to 3500-3750rpm, then allowed to coast down to 2500rpm without pressing the brake or throttle.
This process must be repeated 15 times to complete the adaption.
Manual:
Download: Bentley Mulsanne Engine Control Module Update Manual (2016-2020)
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