U1120 – Lost Wheel Distance

Meaning:

Primarily a Chrysler code, the U1120 means the ABS module is not able to communicate with speed sensors.

Main Symptoms:

One of the U1120 code's symptoms is the Check Engine Light
The Check Engine Light coming on might be an indicator of the U1120 trouble code

Possible Causes:

  • Open in CAN bus + or – circuit
  • Short to power or ground in either + or – CAN bus circuit
  • Defective ABS control module (least likely)

Diagnostic Steps:

  • Using a bidirectional scan tool, control ABS control module and see if it responds. If it doesn’t probe it further
  • If it responds then check all the wires, connectors and fuses that make the circuit
  • With key on engine off, check the voltage of CAN C+ and C-. If the readings don’t match manufacturer’s specs then the communication circuits are bad

Read More: OBD2 Codes List: Meaning, Fixes, and Free Download