U0121-LOST COMMUNICATION WITH ABS
For a complete wiring diagram, refer to the Wiring Information.
Possible Causes
-
When Monitored:
Ignition run time is greater than one second.
Battery voltage between 9 and 16 volts.
Engine run time greater than three seconds.
-
Set Condition:
Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.
Possible Causes |
|---|
| CAN BUS CIRCUITS OPEN OR SHORTED |
| ABS MODULE |
| DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES |
| TOTALLY INTEGRATED POWER MODULE POWER AND GROUND |
| TIPM NOT CONFIGURED CORRECTLY |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| MODULE THAT SET THIS DTC |
ACTIVE DTC
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, select view DTCs. |
Is the DTC Active at this time?
Yes
- (Refer to 28–DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)-Diagnosis and Testing), and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.
No
- (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the Stored Lost Communication DTCs diagnostic procedure.