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P0591

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P0591 OBD-II Trouble Code: Cruise Control Multi-Function Input "B" Circuit Range/Performance

P0591 code means there is electrical malfunction in the cruise control multi-function input "B" often due too corroded connectors or shorted wiring.

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code p0591 has check engine light on, but car has no crusie control, what else is it on for?

According to my records, the code you are receiving is for a powertrain issue relating to cylinder 4 being out of balance. On diesel engines this can indicate a glow plug issue. This can be related to the fuel composition...

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