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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 434 (6.7L Diesel - DTCS P0420 To P1208 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0686- ECM Main Control Circuit Low >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
SCR 1 RELAY
SCR RELAY 1 12-VOLT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
SCR RELAY 1 12-VOLT SUPPLY CIRCUIT SHORT TO GROUND
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  STANDARD PROCEDURE  . 

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