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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1301 (6.7L Diesel - DTCS P0642 To P205E - 2500 Hd & 3500 Hd) >> DTC Troubleshooting >> P0686-ECM Main Control Circuit Low >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
VGT 12-VOLT SUPPLY CIRCUIT SHORT TO GROUND
VGT 12-VOLT SUPPLY CIRCUIT SHORT TO VGT RETURN CIRCUIT
VGT 12-VOLT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
VGT ACTUATOR ASSEMBLY
SCR RELAY 1 12-VOLT SUPPLY FUSE BLOWN
SCR MODULE HEATER SUPPLY CIRCUIT SHORT TO VOLTAGE
SCR MODULE HEATER SUPPLY CIRCUIT SHORT TO GROUND
SCR MODULE HEATER SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
POWER DISTRIBUTION CENTER
DEF DOSING CONTROL UNIT
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L  .