Deere & Company RE528702 ENG Control L18

RE528702 is a 12‑volt Level 18 Engine Control Module (ECM) used in John Deere tractors such as the 4520, 4720, and 5065 series. Common failures for this class of ECMs include power supply dropout, internal fuse blowouts, corrupted firmware, or damaged input/output circuitry due to vibration or moisture ingress. Begin diagnostics by verifying the 12‑volt rail at the module terminals, checking all I/O connectors for continuity and proper polarity, and reviewing any stored diagnostic trouble codes via a compatible OBD interface. If power is present but performance remains erratic, inspect the PCB for burn marks or cracked traces before considering a firmware reflash or replacement.[oss-gpt-20b]

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