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U1120 means the abs module has lost communication with speed sensors. You'll need a scanner to monitor speed sensors. If problem is in module you won't get communication with scanner. Follow your brake lines from master cylinder to ABS pump/module, on the side of in is a wired connector. Undo it and check for moisture or corrosion. Get some dielectric gel and smear it good on all contacts. And plug back in and retest. Might need new module or speed sensor
P0300 is a Random Misfire P0302 #2 Cylinder Misfire U1120 The code U1120 means, lost wheel distance message. The powertrain control module(PCM) is not
receiving a signal from the anti-lock brake module. The problem could be a short in the bus circuit,
the PCM or the anti-lock brake module. This type of problem is best diagnosed by the dealer or a
local shop with the proper diagnostic scanning equipment. Hope this helps.
U1120 means the PCM doesn't receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus. This can be caused by the ABS module, PCM or something wrong with the can bus. This might be just an erroneous code and may never set again