DTC | Description | Fault Trigger Conditions |
|---|---|---|
U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information | A continuous memory DTC that sets in the PAM if messages received from the ABS module are missing for 5 seconds or more. |
Possible Sources
Communication network concern ABS module GWM concern PAM (integral to the BCM)
PINPOINT TEST G : DTC (DIAGNOSTIC TROUBLE CODE) U0121:00
G1 VERIFY THE CUSTOMER CONCERN
Ignition ON. Verify there is an observable symptom present.
Is an observable symptom present?
Yes | GO to G2 |
|---|---|
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. CLEAR the DTC. |
G2 CHECK THE COMMUNICATION NETWORK
Using a diagnostic scan tool, perform the network test.
Do the ABS module and the GWM pass the network test?
Yes | GO to G3 |
|---|---|
No | REFER to: Communications Network (418-00 Module Communications Network) . |
G3 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
Using a diagnostic scan tool, perform the ABS module self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes | REFER to: Anti-Lock Brake System (ABS) and Stability Control (206-09 Anti-Lock Brake System (ABS) and Stability Control, Diagnosis and Testing). |
|---|---|
No | GO to G4 |
G4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes | REFER to: Communications Network (418-00 Module Communications Network) . |
|---|
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