DTC
Description
Possible cause
Action
to battery
Module supply voltage
greater than 16.8
volts
Over voltage of the
battery charging
system
Over voltage
measured between
module ignition and
ground
Over voltage
measured between
module pump supply
and motor ground
Over voltage
measured between
module solenoid
supply and motor
ground
C1A001C System Voltage
Unstable
Circuit voltage out of
range. The HCU has
measured a voltage
outside the expected
range but not
identified as too high
or too low
Module supply voltage
equal too or less than
8.2 volts for more
than 20ms
Low or discharged
battery
Battery charging
system failure
Ground circuit to
module high
resistance, poor
connection, corroded
terminals
Motor ground circuit to
module high
resistance, poor
connection, corroded
terminals
Ignition circuit to
module intermittent
open circuit, poor
connection, corroded
terminals
Pump supply circuit to
module intermittent
open circuit, poor
connection, corroded
terminals
Solenoid supply circuit
to module intermittent
open circuit, poor
connection, corroded
terminals
Check vehicle battery is at correct voltage and is not low or discharged. Check
vehicle charging system is correctly charging the battery. Refer to the electrical
guides and check ground circuit to module for high resistance, poor connection,
corroded terminals. Motor ground circuit to module for high resistance, poor
connection, corroded terminals. Ignition circuit to module intermittent for open
circuit, poor connection, corroded terminals. Pump supply circuit to module for
intermittent open circuit, poor connection, corroded terminals. Solenoid supply
circuit to module for intermittent open circuit, poor connection, corroded terminals.
C1A004A Variant Selection
Incorrect component
installed. Mismatch
between the hardware
connected to the HCU/
module and the
hardware expected by
the HCU
Transferred variant
value not released
Transferred variant
value outside
permissible range
EEPROM values with
valid HCU data
implausible
Transferred variant
values from engine
control module are
invalid for this vehicle
Clear DTCs using the manufacturer approved diagnostic system. Cycle ignition and
wait for brake warning lamps to extinguish, allow up to 30 seconds. If the DTC is
still present carry out the following procedure again using the manufacturer
approved diagnostic system vehicle configuration main menu, special applications,
vehicle identification block read. Contact dealer technical support.
C1A0067 Control Module
Signal incorrect after
event. The HCU has
not seen the correct
change of a parameter
or group of parameters
in response to a
particular event
Incorrect tire pressure
Incorrect size wheel or
tire
Using the manufacturer approved diagnostic system compare the signals for all
the WSS simultaneously. Check for similar values and operation between each
WSS. Check for other WSS DTCs, rectify as required. Clear DTCs road test and
re-check. Contact dealer technical support.