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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> 948TE/9HP48 - DTCS P1D91-00 To P2802-00 >> DTC Troubleshooting >> P1DF3-00-Ecu Not Initialized >> Theory Of Operation

Theory Of Operation

This diagnostic monitors the Ignition input voltage and compares it to Ignition voltage from the Controller Area Network (CAN). If the two values do not match with the ignition off, this DTC sets.