P0566
Cruise Control Off Signal
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.
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.
Related codes
Often seen with P0566
Read & clear P0566 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX