U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE

For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Ignition run time is greater than 1 second. Battery voltage between 10 and 16 volts. Engine run time greater than 3 seconds.

  • Set Condition:

    The PCM doesn't receive an ABS message over the CAN C circuit for 7 consecutive seconds. The circuit is continuously monitored. One Trip fault.


Possible Causes
 
CAN C BUS OPEN OR SHORTED CONDITION
 
ABS MODULE
 
TIPM
 
PCM
 


Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.



Diagnostic Test

1.ACTIVE DTC




Is the DTC Active at this time?

Yes
  • Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.


No