DTC codes / Ford codes / P1662
P1662 on Ford vehicles indicates that the Powertrain Control Module (PCM) has detected a failure in the Injector Driver Module Enable (IDM_EN) circuit, which is the signal path that allows the injector driver module to power the fuel injectors. The PCM monitors this circuit for expected voltage changes and sets the code when the signal is missing, shorted, or out of range, meaning the engine may not receive proper fueling commands.
Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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