DTC Fault Trigger Condition-CCM
DTC | Description | Fault Trigger Conditions |
|---|---|---|
U0121:00 Lost Communication with Anti-Lock Brake System (ABS) Control Module: No Sub-Type Information | Sets in the CCM if data messages received from the ABS module over the HS-CAN2 are missing. |
DTC Fault Trigger Condition-PCM
DTC | Description | Fault Trigger Conditions |
|---|---|---|
U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module | Sets in the PCM if data messages received from the ABS module over the HS-CAN2 or from the GWM over the HS-CAN1 are missing. |
Possible Sources
ABS module CCM GWM PCM
PINPOINT TEST E : U0121:00 OR U1021
E1 VERIFY THE CUSTOMER CONCERN
Ignition ON. Verify there is an observable symptom present.
Is an observable symptom present?
Yes | GO to E2 |
|---|---|
No | The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. |
E2 CHECK THE COMMUNICATION NETWORK
Ignition ON. Using a diagnostic scan tool, perform a network test.
Does the ABS module pass the network test?
Yes | GO to E3 |
|---|---|
No | REFER to: Communications Network (418-00 Module Communications Network) . |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.