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What does the Mercedes-Benz 0230 fault code mean?

1 Answers

LondynAnn

09/03/25 7:54am

Mercedes-Benz 0230 fault code indicates a main circuit failure of the fuel pump. Below are the inspection methods for the fuel pump main circuit failure: Measure the corresponding wiring harness of each terminal: Disconnect the connectors of the noise suppressor, fuel pump relay, and air conditioning controller, then measure the continuity of the corresponding wiring harness for each terminal. All should be in good condition (the resistance value of the corresponding wiring harness should be 0). Measure the resistance: Measure the resistance between the corresponding wiring harness of each terminal and the ground. According to the circuit analysis, the actual measurement should show a resistance value of 0 between each terminal of the signal line wiring harness and the ground. Cause of the fault: The control signals of the noise suppressor, fuel pump relay, and air conditioning controller are grounded, causing the fuel pump relay and air conditioning controller to lose their working signals. As a result, the fuel pump cannot supply the required fuel to the engine after the crankshaft starts rotating, leading to the fuel pump not working.

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