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Home >> Fiat >> 2014 >> 500c Abarth >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Body Control Module (BCM) - DTCS B226A-00 To U1493-00 - 500E) >> Diagnosis And Testing >> U121B-00-Lost Communication With Vehicle Tracking Module (Telematics Control Unit) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2014 Fiat 500e. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
TELEMATICS CONTROL UNIT (TCU) POWERS AND GROUNDS
TELEMATICS CONTROL UNIT (TCU)
BOTH CAN B BUS CIRCUITS OPEN
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