Scania fault code 638
Code 638 is used by 5 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Fault in propulsion battery power supply
Communication with the propulsion battery UI sensor interrupted.
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COO Coordinator
Brake pedal sensor
The brake pedal sensor's 2 output signals (normal and redundant) are implausible in relation to each other.
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CUV Visibility system
Headlamp, right
Incorrect CAN message from the internal control unit in the right-hand headlamp.
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BCI
Information fault, trailer weight
Faulty information regarding trailer weight.
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CMS
Switch, inhibit automatic front kneeling
The signal from the instrument panel switch for inhibiting automatic front kneeling is implausible. The signal has been active for more than 180 seconds.
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