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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 ((On-Board-Charging Module (OBCM) - Electrical Diagnostics - 500 - Electric)) >> DTC Troubleshooting >> U1202-00-Lost Communication With Electronic Vehicle Control Unit >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
ELECTRIC VEHICLE CONTROL UNIT (EVCU)
EVCU POWER AND GROUND
MODULE THAT SET THIS DTC
WARNING:

On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury.

NOTE: When performing any key-on procedure you must charge the 12 volt battery with a setting of 20 amps minimum or the High Voltage Battery could discharge below recommended manufacture specifications and destroy the battery cells. 

Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE to perform the High Voltage Power Down procedure.

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