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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Electronic Shift Module (ESM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1C78-16 - AUTORETURN Supply Voltage-Circuit Voltage Below Threshold >> Possible Causes

Possible Causes

Possible Causes
CHARGING SYSTEM DTCS
ESM POWER AND GROUND CIRCUITS
ELECTRONIC SHIFT MODULE (ESM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  STANDARD PROCEDURE  .