P0578

Cruise Control Multi-Function Input A Circuit Stuck

Q: Is it safe to drive with P0578?

Yes. The fault is limited to the cruise control system. You can drive normally, but cruise control won't work until the stuck input is repaired.

Q: Can I just clear P0578?

It will come back while a switch contact stays stuck or a wire is shorted. Repair the circuit to clear it permanently.

Cruise control Generic OBD-II Low

What it means

P0578 means the ECM sees the cruise control multi-function input 'A' as stuck — a button or switch contact that reads as continuously active. It usually points to the cruise switch or its wiring. Cruise control won't operate, but the rest of the vehicle is unaffected and safe to drive.

Low

Can I keep driving? Safe to drive — only the cruise control is affected; engine, brakes, and steering 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

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

Cruise control does not function
Cruise control indicator light on the dash
Check-engine light on
Unable to set or hold a steady speed with cruise

Common causes

Most likely first

Faulty cruise control multi-function switch (stuck input)Likely
Damaged or shorted wiring in the cruise control circuitCommon
Loose or corroded connections in the cruise control circuitCommon
Failed brake pedal position switchLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check whether a cruise button reads as constantly pressed.
Test the multi-function (cruise) switch for a stuck or shorted contact.
Inspect the wiring and connectors for shorts, opens, or corrosion.
Check the brake pedal position switch, which can interrupt cruise operation.
Repair or replace the faulty switch or wiring, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0578?+

Yes. The fault is limited to the cruise control system. You can drive normally, but cruise control won't work until the stuck input is repaired.

Can I just clear P0578?+

It will come back while a switch contact stays stuck or a wire is shorted. Repair the circuit to clear it permanently.

Read & clear P0578 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