Troubleshooting
Error Location Type Description
Cause Solution
Overtemperature
switch sensed a
fluid temperature
above 230°F
(110°C).
Heater was delivered too
much power, causing the
overtemperature switch to
open. RTD is not reading
properly. After the heater
cools down, replace RTD.
Switch closes and the error
canbeclearedwhenthe
heater temperature falls
below 190°F (87°C).
Disconnected
or loose
overtemperature
switch
cable/connection.
If heater is not actually
over temperature, check
all wiring and connections
between the TCM and the
overtemperature switches.
T4EB Heater B High Temperature
Switch B
Overtemperature
switch failed in the
open position.
Replace overtemperature
switch.
Disconnected or
loose RTD cable or
connection.
Check all wiring and
connection to RTD.
T6DA Heater A Sensor Error A
Bad RTD.
Switch the RTD with
another and see if the error
messagefollowstheRTD.
Replace RTD if the error
follows the RTD.
334946A 33
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