P0577
Cruise Control Input Circuit High
Cruise control
Generic OBD-II
Low
What it means
P0577 means the voltage on the cruise control input circuit is higher than expected, usually from a faulty switch or a short to power in the wiring. It can keep cruise control from engaging or make it behave erratically, but it does not affect how the engine runs or how the car brakes and steers.
Low
Can I keep driving? Safe to drive — cruise control may not work, but the engine, brakes, and steering are unaffected.
Common symptoms
What you'll notice
- Cruise control will not engage or behaves erratically
- Cruise control indicator or check-engine light may be on
- Cruise speed cannot be set or adjusted
- No effect on normal engine performance
Common causes
Most likely first
- Faulty cruise control switch reading a stuck-high signalLikely
- Short to voltage in the cruise control input wiringCommon
- Corroded or loose connector at the switchCommon
- Brake or clutch switch input fault affecting the circuitLess often
- Less commonly, a faulty ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see the conditions when it set.
- Inspect the cruise switch wiring and connector for a short to power.
- Measure the input voltage while operating the switch and compare to spec.
- Replace the cruise control switch if it reads high or fails its test.
- Repair any wiring faults, then clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P0577?+
Yes. The fault is on the cruise control input signal; it may stop cruise from working but does not affect engine, braking, or steering.
Can I just clear P0577?+
It will return until the shorted wiring or switch is repaired. Clearing alone doesn't fix the high-voltage signal.
Related codes
Often seen with P0577
Read & clear P0577 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