BENTLEY CONTINENTAL GT 6.0 2012 W12 Engine Control Unit + Key

2012 Bentley Continental GT (W12), replacing the Engine Control Unit (ECU) and key is a complex security procedure because of Bentley’s “Master/Slave” computer architecture and the KESSY (Keyless Entry and Start Systems) immobilizer integration.

1. The Dual-ECU System

The 6.0L W12 does not run on a single computer. It uses two identical ECUs that work in tandem:

• Master ECU (Bank 1): Controls cylinders 1–6.

• Slave ECU (Bank 2): Controls cylinders 7–12.

• Sync Requirement: These two modules are digitally “paired.” If you are replacing one, it must be programmed to recognize the other. If you are buying a used set, it is highly recommended to buy the matched pair from the donor car to avoid communication errors like P1923.

2. Part Identification & Numbers

For the 2012 model year (Second Generation/New Continental GT), the ECU part numbers typically begin with 07C:

• Common Part Number: 07C906018 (followed by suffixes like KM, GS, or H depending on regional emissions).

• KESSY Module: The immobilizer data actually lives in the KESSY Control Module (typically located under the dashboard/carpet). A key and ECU swap often requires this module to be included if you want a “plug-and-play” solution.

3. Key & Immobilizer Programming

You cannot simply “plug in” a used ECU and key and expect the car to start. The Bentley security system uses Component Protection.

• The “Matched Set”: To avoid dealer programming, you would need the Master ECU, Slave ECU, KESSY Module, and the Key Fobs all from the same donor car.

• Cloning: The most common professional solution is to “clone” your original ECU data. A specialist reads the immobilizer PIN and VIN from your old unit and writes it to the replacement unit.

• Dealer Path: If you buy a brand-new ECU, a Bentley dealer must use the ODIS/GEKO online system to link the new module to Bentley’s central database in Crewe.

4. Critical Warning: Water Damage

The most frequent cause for 2012 Bentley ECU failure is water ingress.

• The ECUs are located in the “plenum chamber” (under the windshield cowl).

• If the rubber drains (scuttle drains) become blocked by leaves or debris, water backs up and submerges the ECUs.

• Before installing new units: You must clear these drains, or the new ECUs will likely fail during the next heavy rain.

5. Estimated Costs (2026)