Specifications

Chassis Specialist : Electric Power Steering
Page 9
B2477
Module Configuration Failure
B3104
Steering Shaft Position sensor Malfunction
C2000
Steering Angle Sensor Not Calibrated
U0100
Loss of Communications with the ECM/PCM
U0101
Loss of Communications with the TCM
U0155
Loss of Communications with the Instrument Panel Cluster
(IPC)
U2023
Fault Received from External Node
C1277
Steering Wheel Angle 1 and 2 Circuit Failure
C1278
Steering Wheel Angle 1 and 2 Signal Failure
For trouble codes B1317 and B1318, check the system voltage is between 10 and 16 volts at the PSCM
connector. For DTC’s B2277, B2278 B3104, C1277 and C1278 inspect for an open or short in the
PSCM power feed or an open or short in the high speed CAN bus. If ok, suspect an internal failure of
the torque or position sensors or an internal short or open in the EPAS motor.
If the customer concern is steering related with no diagnostic trouble codes, it will be necessary to
inspect mechanical components. Verify the tires and the pressures are correct. Inspect the steering
column for binding, loose steering column bolts and inspect the intermediate shaft for binding. Inspect
the steering gear, tie rod ends and other suspension components.
If the PSCM requires replacement the new module will require programming. The PSCM needs to be
programmed “vehicle specific”. The suspension option, tire size and power train options are used by
the PSCM to determine the correct assist level for the vehicle.
If there is a problem with the EPAS motor, the torque and/or position sensors or there is a problem with
the steering column it will have to be replaced as an assembly. After replacing the steering column it
also has to be initialized.