Scania fault code 40998
Code 40998 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
CCU
Control unit, voltage too high
The cab comfort control unit has interpreted that the +24 V supply voltage is above +32 V.
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ACC Automatic Climate Control
Voltage supply, 24 V
The cab comfort control unit has interpreted that the +24 V supply voltage is above +32 V.
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