Cruise Control Multi-Function Input "B" Circuit Stuck
The P0590 code means the vehicle's onboard diagnostic system has detected: Cruise Control Multi-Function Input "B" Circuit Stuck. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $400 (parts and labor)
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What Are the Symptoms of P0590?
- Check Engine Light on
- Cruise control will not engage or cancels on its own
- Vehicle otherwise drives normally
What Causes P0590? (Most Likely First)
- Sticking or jammed cruise control switch High
- Shorted wiring holding the input in one state Moderate
- Faulty clock spring Moderate
- Control module input fault Low
Can I Still Drive with P0590?
Yes, but fix soon. P0590 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
What does P0590 mean?
P0590 means Cruise Control Multi-Function Input "B" Circuit Stuck. Cruise control switch input "B" is reading as held in one position for longer than expected.
Can I still drive with this cruise control code?
Yes. It affects the cruise control, not how the vehicle drives. Fix it when convenient, and keep an eye on the Check Engine Light so it does not hide a new code.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0590?
-
Check which switch or input carries "B" on your vehicle in the service information.
-
Watch the cruise switch inputs on a scan tool while pressing each button.
-
Inspect the steering wheel switch connector and, if fitted, the clock spring wiring.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
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