P0585Generic code

P0585 Code: Cruise Control Multi-Function Input A/B Correlation

The P0585 code means the computer sees a fault in the signal from the cruise control switches, because multi-function inputs A and B do not correlate with each other. Cruise control is disabled, and the rest of the vehicle works normally. Check the clockspring and the buttons first.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$20 to $400
Difficulty
Medium
System
Idle and Speed Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0585 code means

The cruise control switches, on the steering wheel or on a stalk, send their orders to the computer over one or more wires. Many manufacturers use one line with a different resistance for each button, and the computer reads which button is pressed from the voltage it measures.

The P0585 code means the computer sees a signal that matches no button, a signal that stays fixed as if a button were always pressed, or a signal that does not agree with the second control line, which is the case here since inputs A and B do not match. For safety, it turns cruise control off.

The most common cause is the steering wheel clockspring, which links the buttons to the vehicle through a ribbon that wears as the wheel turns. Dirty buttons or spilled liquid are another usual cause.

Always begin with the easy items: fuse, relay and connector. After that, check power, ground and signal with the component connected (using back-probe pins), and last the continuity of every wire to the computer. Replace the component only if all of that checks out.

P0585 code symptoms

  • Cruise control that does not work.
  • Check engine light or cruise control light on.
  • Sometimes the horn or the steering wheel buttons also fail (clockspring).

Likely causes of the P0585 code

  1. Damaged steering wheel clockspring. The ribbon inside breaks with use.
  2. Steering wheel buttons that are dirty or damaged by spilled liquids.
  3. Control module connector with a loose, intermittent contact.
  4. Brake switch, if it affects the cancel signal.

How to diagnose the P0585 code step by step

  1. Read the status of each button on the scan tool while you press it. Only the pressed button should change.
  2. Measure the resistance of the controls in each position and compare it with the manufacturer table.
  3. Inspect the clockspring if the horn, the airbag light or the steering wheel buttons also fail.
  4. Check the brake switch.

How to fix the P0585 code

  • Replace the clockspring or the steering wheel controls.
  • Clean the contacts of the buttons.
  • Repair the wiring.
  • Clear the code and test cruise control.

Technical reference data

  • Resistor ladder controls: each button puts a different voltage on the same line.
  • Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

Before working at the steering wheel, disconnect the battery and wait a few minutes. The driver airbag can fire.

P0585 on Ford

The clockspring is a frequent fault on many Ford vehicles.

P0585 on GM

The clockspring is a frequent fault on many GM vehicles.

P0585 on Chrysler

The clockspring is a frequent fault on many Chrysler vehicles.

Frequently asked questions about P0585

Can I drive with the P0585 code?
Yes. It only affects cruise control. The engine, the brakes and everything else work as usual, so it is not a safety risk on the road.
What is the clockspring?
It is a ribbon wound inside the steering column that connects the airbag and the buttons to the vehicle even while the steering wheel turns. If it wears out, the buttons stop working.
Is it dangerous to remove the steering wheel?
Yes, because of the airbag. Follow the manufacturer procedure, disconnect the battery and wait before you touch anything.
How much does it cost to fix P0585?
Between $20 and $400. A cleaned contact or a repaired wire is cheap, while a clockspring or new steering wheel controls cost more.
What does the P0585 code mean?
The P0585 code is a generic OBD2 code for a correlation fault between cruise control multi-function inputs A and B. The two signals do not agree, so the computer shuts the system down.
What is the most common cause of P0585?
A worn clockspring in the steering wheel. Dirty buttons and a loose connector follow.

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