Pinpoint Test C : DTC U0121:87: Notes

Normal Operation 

• DTC U0121:87 (Lost Communication With Anti-Lock Brake System (ABS) Control Module: Missing Message) - sets in the Body Control Module (BCM) if data messages received from the ABS module are missing. For a complete list of all network messages, refer to Module Communications Network .

This pinpoint test is intended to diagnose the following: 

• Communication network concern
• ABS module
• BCM