U0121 Lost communication with ABS


When monitored this diagnostic runs continuously when the following conditions are met : 

- Engine run time greater than three seconds.

- Battery voltage between 9.0 and 16.0 volts.

Set condition : This is a non mil fault.

Possible causes U0121 code:

- 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

Diagnostic test U0121

Check for an active DTC

Turn the ignition on. With the scan tool, read DTCs and record on the repair order.

Is the DTC active or pending ?

Yes, refer to totally integrated power (TIPM) diagnosis and testing and perform the U0121 lost communication with anti lock brake module diagnostic procedure.

No, refer to non DTC diagnostics/comunication - diagnosis and testing and perform the stored lost communication DTCs diagnostic procedure.

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