Mercedes AMG ME9.7 M156 Engine Control Module ECU A1561502379

the Bosch ME9.7 Engine Control Unit (ECU) with part number A1561502379 remains a critical component for the legendary 6.2L V8 M156 engine. This specific ECU version was used across various AMG models including the C63, E63, SL63, and CLS63.

As these cars age into “modern classic” status, the ECU has become a common failure point due to its mounting location, which exposes it to significant engine heat and vibration.

1. Technical Identification

• Part Number: A1561502379 (replaces/supersedes several earlier numbers).

• Control System: Bosch ME9.7.

• Engine: M156 6.2L (6208cc) Naturally Aspirated V8.

• Function: Manages ignition timing, fuel injection, variable valve timing (VVT), and the complex drive-by-wire system.

2. 2026 Market Pricing (Estimated USD)

Replacing a Mercedes ECU is notoriously expensive because the part is a “TRP” (Theft Relevant Part), meaning it is digitally locked to the vehicle’s VIN and EIS (Electronic Ignition Switch).

3. Common 2026 Failure Modes

The ME9.7 ECU is prone to specific internal circuit failures:

• No Communication: The car cranks but won’t start; the scanner cannot “see” the ECU.

• Misfire Codes (Random): Often localized to one bank, even after replacing plugs and coils. This is usually caused by failing injector driver circuits inside the ECU.

• Throttle Body Faults: The ECU loses the ability to calibrate the dual throttle bodies, leading to “Limp Mode.”

• Heat Soak: The car runs perfectly when cold but dies or misfires once the engine reaches operating temperature.