Troubleshootin
g
Error Location Type Description
Cause Solution
Overtemperat
ure
switch sensed
a
fluid temperat
ure
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 can be cleared when
the heater temperature falls below
190° F (87° C).
Disconnect
ed or
loose overt
em-
perature sw
itch
cable/conn
ec-
tion.
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.
333024N 35
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