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P0591 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
The Cruise Control System uses several input switches (i.e. Coast and Accelerate) If the engine computer (PCM) sees a signal from more than one switch at a time, code P0591 will set and the cruise control system will be disabled.
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OBD-II Code Cruise control will not operate is defined as a Cruise Control Multi-Function Input "B" Circuit Range/Performance
The Cruise Control System uses several input switches (i.e. Coast and Accelerate) If the engine computer (PCM) sees a signal from more than one switch at a time, code P0591 will set and the cruise control system will be disabled.