P0200

P0200 is a generic injector circuit fault that means the PCM detected an electrical anomaly on the injector driver circuit but could not isolate it to a specific cylinder, which usually points to a shared power feed, a failed driver inside the PCM, or a wiring harness issue upstream of the injector connectors rather than the injectors themselves. Cheapest-first ladder: start with a noid light at each injector connector with the key cranking to confirm the PCM is pulsing all drivers, then back-probe the constant 12V feed side (should read battery voltage key-on, within 0.3V of battery) before condemning anything; next, measure injector resistance at the connector pins with the harness unplugged (port-fuel injectors should fall in the 11 to 17 ohm range at 68F, GDI direct injectors run 1 to 3 ohms because they are peak-and-hold driven at 65V boost), and scope a single driver pulse-width at warm idle which should sit between 2.0 and 3.5 ms on a healthy port-fuel engine and balloon to 18 to 22 ms at WOT. The expensive misdiagnosis on P0200 is replacing a full set of injectors at $600 to $1,800 when the actual failure is a corroded ground splice, a chafed harness against the valve cover, or in diesel and EcoBoost applications a fuel-control module that the PCM reports as an injector circuit fault.

Vehicle-specific patterns: 2003-2007 Ford 6.0L Powerstroke diesel commonly throws a bare P0200 when the FICM (Fuel Injection Control Module) loses one of its three power supplies or its 48V boost rail sags below 45V, and the fix is FICM rebuild or replacement rather than injectors; 2007-2013 GM 5.3L LS trucks with Multec port injectors throw P0200 from a melted injector connector under cylinder 7 or 8 where exhaust heat soaks the harness; 2008-2013 BMW N54 335i triggers P0200-family faults when the high-pressure fuel pump fails and rail pressure collapse trips multiple injector drivers simultaneously (BMW SI B13 02 09 covers HPFP replacement under extended warranty); 2011-2016 Ford 6.7L Powerstroke throws P0200 from harness chafe on the valve-cover gasket where injector pigtails pass through. Estimated repair: $35 to $3,200.