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Home >> Jeep >> 2011 >> Compass Base, 2.0 A, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 ((Transmission Control Module (TCM) Electrical Diagnostics - CVT Automatic Transmission) - MK) >> DTC Troubleshooting >> U0121 - Lost Communication With Antilock Brake Module >> When Monitored

When Monitored

WARNING: This page is about a different car, the 2017 Jeep Patriot and 2017 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

Ignition on in the run position with a system voltage between 9.0 and 16.0 volts.

IOD fuse is installed or vehicle odometer is over 80 kilometers (50 miles).

No CAN C BUS DTCs present.