P0566

Cruise Control Off Signal

Q: Is it safe to drive with P0566?

Yes. This code only affects the cruise control system. The car drives, brakes, and accelerates normally — you just may not be able to rely on cruise until it's fixed.

Q: Can I just clear P0566?

You can, but it will return once the ECM again detects a problem with the cruise off signal. Fix the switch or wiring to keep it from coming back.

Cruise control Generic OBD-II Low

What it means

P0566 means the engine computer detected a problem with the cruise control "off" signal — the input that tells the system to disengage. When this signal misbehaves, cruise control may refuse to switch on or drop out unexpectedly. It's a comfort-feature fault, so normal driving is unaffected.

Low

Can I keep driving? Safe to drive — only the cruise control is affected; all normal driving, braking, and acceleration are unchanged.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P0566 scans

P0567in 84.6% of scans

P0565in 83.3% of scans

P0500in 78.2% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Cruise control won't turn on or shuts off unexpectedly
Cruise control indicator light behaves erratically
No effect on normal driving

Common causes

Most likely first

Faulty cruise control on/off switchLikely
Malfunctioning brake pedal switch (shares the cancel/off signal)Common
Damaged or shorted wiring in the cruise control circuitCommon
Failed cruise control moduleLess often
Failed engine control module (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check the cruise control on/off switch for correct operation with a meter.
Test the brake light/pedal switch, since it feeds the cruise off signal — a common and cheap fix.
Inspect the cruise control wiring and connectors for damage, shorts, or corrosion.
If switches and wiring are good, test the cruise control module. Clear the code and re-test.

FAQ

Quick answers

Is it safe to drive with P0566?+

Yes. This code only affects the cruise control system. The car drives, brakes, and accelerates normally — you just may not be able to rely on cruise until it's fixed.

Can I just clear P0566?+

You can, but it will return once the ECM again detects a problem with the cruise off signal. Fix the switch or wiring to keep it from coming back.

Read & clear P0566 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX