Bosch 0 281 001 151 is the engine‑control unit (ECU) for Mack trucks’ V‑MAC I fuel injection system, typically mounted in the cab or under‑hood and interfacing with crankshaft position, camshaft sensors, and the fuel rail. Common failure modes include loss of power supply to the ECU, corrupted flash memory from electrical surges, sensor misreadings that trigger fault codes (e.g., crankshaft position or injector timing), and damaged harness connectors due to vibration or corrosion. First‑check diagnostics should verify the 12 V/24 V bus voltage at the ECU connector, inspect all wiring and terminal contacts for signs of wear or loose connections, and review any stored diagnostic trouble codes via a compatible scan tool before proceeding with memory reflash or component replacement.[oss-gpt-20b]