P0577Generic code

P0577 Code: Cruise Control Input Circuit High

The P0577 code means the computer sees a fault in the signal from the cruise control switches, a high signal in the cruise control input circuit. Cruise control is disabled, and the rest of the vehicle works normally. The steering wheel clockspring is the first thing to check.

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 P0577 code means

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

The P0577 code means the computer sees a signal that does not correspond to any button, a signal that stays fixed as if a button were always pressed, or a signal that does not match the second control line. As a safety measure, it disables cruise control.

The most frequent cause is the steering wheel clockspring, which 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 things: 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 when all of that is fine.

P0577 code symptoms

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

Likely causes of the P0577 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 an intermittent contact.
  4. Brake switch, if it affects the cancel signal.

How to diagnose the P0577 code step by step

  1. Watch the status of each button on the scan tool as 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. Check the clockspring if the horn, the airbag light or the steering wheel buttons also fail.
  4. Check the brake switch.

How to fix the P0577 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 gives a different voltage on the same line.
  • Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

When you work on the steering wheel, disconnect the battery and wait a few minutes first. The driver airbag can fire.

P0577 on Ford

The clockspring is a frequent failure on many Ford vehicles.

P0577 on GM

The clockspring is a frequent failure on many GM vehicles.

P0577 on Chrysler

The clockspring is a frequent failure on many Chrysler vehicles.

Frequently asked questions about P0577

Can I drive with the P0577 code?
Yes. It only affects cruise control. The engine, brakes and the rest of the vehicle 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 handle anything.
How much does it cost to fix P0577?
Between $20 and $400. Cleaning a contact or repairing a wire is cheap, while a clockspring or new steering wheel controls cost more.
What does the P0577 code mean?
The P0577 code is a generic OBD2 code for a high signal in the cruise control input circuit. The computer does not accept the switch signal, so it turns the system off.
What is the most common cause of P0577?
A worn clockspring in the steering wheel. Dirty buttons and a loose connector come next.

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