P0590 Buick Speed Control Multiplexed Switch Performance
Possible causes
– Faulty Speed Control Switch
– Speed Control Switch harness is open or shorted
– Speed Control Switch circuit poor electrical connection
– Speed Control Switch harness is open or shorted
– Speed Control Switch circuit poor electrical connection
What about the obd code?
The Steering Column Control Module (SCCM) has detected that the Speed Control Switch 2 is not operating correctly
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
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