Scania fault code 591
Code 591 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
COO Coordinator
Communication with the retarder
The coordinator has identified divergent information from the GMS control unit, which controls the retarder.
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CUV Visibility system
Headlamp levelling switch
The signal from the switch has been missing or has had an incorrect value for one second.
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BCI
Short circuit, C259-13
Short circuit to ground or overload.
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