U0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE
For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
Continuously when the ignition is on.
The battery voltage between 10 and 16 volts.
Ignition Off Draw (IOD) fuse installed.
Totally Integrated Power Module (TIPM) is configured correctly.
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Set Condition:
Bus messages not received from the Anti-lock Brake System (ABS) Module for approximately two to five seconds.
Possible Causes |
|---|
| CAN BUS CIRCUITS OPEN OR SHORTED |
| 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 |
VERIFY THE DTC IS ACTIVE
| NOTE: | Make sure the IOD fuse is installed and the battery is fully charged before proceeding. |
| 1. | Turn the ignition on. |
| 2. | With the scan tool, read active DTCs. |
Is the DTC active at this time?
Yes
- (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) /Diagnosis and Testing) and perform the U0121-00-Lost Communication with Anti-lock Brake System (ABS) Control Module diagnostic procedure.
No
- (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the Stored Lost Communication DTCs diagnostic procedure.