Welcome to 2CarPros. Those are both communication error codes. U1110 means the PCM didn't receive a vehicle speed signal from the Anti-lock brake Module. U1120 is a lost wheel distance message. These can be caused by a bad or damaged wiring harness to the ABS module or by a failing power-train control module. I would start by looking at the connections on the ABS module for corrosion or water damage as well as looking the harness over for any rodent or physical damage. These signals are carried on the CAN C communications buss and a short in that line can set these codes as well as stop the speedometer and tachometer from working. To test that you would need a factory scan tool that can look at the networks and see if it has the correct signal and which modules are active.
Oct 23, 2019 at 7:34 AM
