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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (948TE Electronic Shift Module (ESM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1C81-54-Shift Lever Position Indeterminate-Missing Calibration >> Theory Of Operation

Theory Of Operation

The Electronic Shift Module (ESM) performs various internal tests to verify proper controller operation. This DTC indicates that there is a fault with the ESM circuitry or the ESM internal processor.