P0277 is a generic OBD-II code meaning the Engine Control Unit measured a signal voltage above the expected window in the fuel injector circuit for cylinder 6. A 'high' circuit reading usually points to a break in the circuit, a short to battery voltage, or an injector coil with too much resistance. The ECU will often disable fuel delivery to cylinder 6 to protect the driver stage, so the engine runs with a dead cylinder until the fault is repaired.
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