P06EC — Fuel Injector Control Module Requested MIL Illumination

Causes

• Internal fault detected by the FICM
• Loss of communication between FICM and PCM (CAN/LIN/serial)
• Faulty wiring or connector to the FICM
• Low or intermittent supply voltage or poor ground
• Corrupted module software or calibration
• Related injector driver or injector circuit fault

Symptoms

• MIL (Check Engine Light) illuminated at the driver display
• One or more stored or pending DTCs related to FICM, injectors, or communication
• Reduced drivability, rough idle, misfire, or hard start (depending on severity)
• Intermittent loss of injector control reported by scan tool
• Possible limp-home or reduced power mode if PCM protects engine

What to check

• Retrieve all stored, pending, and freeze-frame codes with a capable scan tool; note timestamps and mileage
• Verify vehicle battery voltage and charging system under load (expect ~11–14 V during cranking and 13–14.5 V at idle with engine running)
• Inspect FICM connector, pins, and wiring for corrosion, bent pins, heat damage, or water intrusion
• Check ground integrity for FICM and engine harness (measure resistance to chassis and battery negative)
• Confirm CAN bus or other communication lines are present and within expected idle voltages and show traffic on a scope or scan tool
• Review module software/calibration level and service bulletins for known FICM issues

Signal parameters

• FICM supply voltage: nominal 11–14.5 V (verify under cranking and running conditions)
• FICM ground: near 0 Ω to chassis (low milliohms resistance expected)
• CAN bus idle voltages: roughly 2.5 V (both CAN high/low around midpoint) and differential ~0 V to small idle; active communication shows differential messaging
• Injector driver output: pulse signals from the FICM; pulse width and frequency vary with engine conditions (verify presence of pulses with a scope or no-load test tool)
• Injector control voltage swing: typically 0–battery voltage for high-side/low-side drivers depending on architecture
• Injector current when commanded: within manufacturer expected range (measure with appropriate current probe if available)

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