P0592Generic code

P0592 Code: Cruise Control Multi-Function Input B Circuit Low

The P0592 code means the computer sees a fault in the signal from the cruise control switches, a low signal on multi-function input B. Cruise control is disabled, and the rest of the vehicle works normally. Check the clockspring and the wiring 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 P0592 code means

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

The P0592 code means the computer sees a signal that matches no button, a signal that stays fixed as if a button were pressed all the time, or a signal that does not agree with the second control line. 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 start with the simplest checks: fuse, relay and connector. Then check power, ground and signal with the component connected (using back-probe pins), and finally the continuity of each wire to the computer. Replace the component only if all of that is good.

P0592 code symptoms

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

Likely causes of the P0592 code

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

How to diagnose the P0592 code step by step

  1. Look at the status of each button on the scan tool as 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 P0592 code

  • Replace the clockspring or the steering wheel controls.
  • Clean the button contacts.
  • 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

Disconnect the battery and wait a few minutes before working on the steering wheel. The driver airbag can deploy.

P0592 on Ford

On many Ford vehicles a failed clockspring is common.

P0592 on GM

On many GM vehicles a failed clockspring is common.

P0592 on Chrysler

On many Chrysler vehicles a failed clockspring is common.

Frequently asked questions about P0592

Can I drive with the P0592 code?
Yes. It only affects cruise control. The engine, brakes and everything else work normally, and 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 P0592?
Between $20 and $400. Cleaning a contact or repairing a wire is cheap, and a clockspring or steering wheel controls cost more.
What does the P0592 code mean?
The P0592 code is a generic OBD2 code for a low signal on cruise control multi-function input B. The computer does not accept the switch signal, so it shuts the system down.
What is the most common cause of P0592?
A worn clockspring in the steering wheel, followed by dirty buttons and a loose connector.

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