Error code
OBD2 P0591
OBD2P0591
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Cruise Control Multi-Function Input 'B' Circuit Range/Performance.
Severity
moderateCan drive, but cruise control will not function.
Summary
P0591 indicates an issue with the cruise control multi-function input 'B' circuit's range or performance in your vehicle's cruise control system.
Symptoms
- Cruise control is disabled
- Malfunction indicator lamp (MIL) may illuminate
Common Causes
- Poor connection or wiring issues
- Faulty clock spring
- Mechanical fault with the multi-function switch
Diagnosis
- Check fuses and wiring harnesses for damage
- Inspect connectors for bent pins or corrosion
- Perform continuity checks on circuits using a digital multimeter
Fixes
- Replace faulty clock spring or multi-function switch
FAQ
Can I drive with P0591?
Yes, but cruise control will not work.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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