P0566Generic code

P0566 Code: Cruise Control Off Signal

The P0566 code means the computer sees a fault in the signal from the cruise control switches, specifically the OFF signal. Cruise control is disabled, and the rest of the vehicle works normally. Start with the steering wheel clockspring and the buttons.

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 P0566 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 recognizes which button is pressed by the voltage it measures.

The P0566 code means the computer sees a signal that does not correspond to any button, a signal that stays fixed as if a button were pressed all the time, or a signal that does not match the second control line. For safety, it turns cruise control off.

The most frequent cause is the clockspring in the steering wheel. It connects the buttons to the vehicle through a ribbon that wears out as the wheel turns. Another common cause is buttons that are dirty or have had liquid spilled on them.

Always begin with the simplest checks: fuse, relay and connector. Then check power, ground and signal with the component connected (using back-probe pins), and last the continuity of each wire to the computer. Replace the component only if all of that is good.

P0566 code symptoms

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

Likely causes of the P0566 code

  1. Damaged steering wheel clockspring. The internal ribbon breaks from use.
  2. Dirty or damaged steering wheel buttons from spilled liquids.
  3. Control module connector with a poor, intermittent contact.
  4. Brake switch, when it affects the cancel signal.

How to diagnose the P0566 code step by step

  1. Look at the status of each button on the scan tool while you press it. Only the button you press should change.
  2. Measure the switch resistance 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 P0566 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.

P0566 on Ford

The clockspring is a frequent failure on many Ford vehicles.

P0566 on GM

The clockspring is a frequent failure on many GM vehicles.

P0566 on Chrysler

The clockspring is a frequent failure on many Chrysler vehicles.

Frequently asked questions about P0566

Can I drive with the P0566 code?
Yes. It only affects cruise control. The engine, the brakes and everything else work normally, so there is no safety risk while driving.
What is the clockspring?
It is a coiled ribbon in the steering column that connects the airbag and the buttons to the vehicle even as the steering wheel turns. When 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 P0566?
Between $20 and $400. Cleaning a contact or fixing a wire is cheap, and a clockspring or new steering wheel controls cost more.
What does the P0566 code mean?
The P0566 code is a generic OBD2 code for a fault in the cruise control OFF signal. The computer does not accept the signal from the switches, so it disables the system.
What is the most common cause of P0566?
A worn clockspring in the steering wheel. Dirty buttons and a loose connector are the next most likely causes.

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