Doosan fault codes can be confusing. V-codes, flash codes, or SPN/FMI formats appear on different systems. But most codes share a few common causes. Communication faults (V201, V202) often point to wiring or ground issues. Starting and charging faults (Code 53/54) usually mean low battery voltage or alternator problems. Temperature codes (Code 14/15) may be a bad sensor or real overheating. Hydraulic faults affect digging force and boom response. Before replacing parts, do these first checks: measure battery voltage at rest and during cranking, confirm charging output (13.8V–14.4V), inspect grounds and connectors, then test the affected circuit. Fix the electrical root cause first. If replacement parts are needed, FridayParts offers high-quality aftermarket options at affordable prices.