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P0585 Cruise control switch: readings don't match ("A")

By: Diagno editorial team · Updated: 2026-10-15

P0585 means: Cruise control switch: readings don't match ("A"). There is a fault in the cruise control or its switches. OK to drive, but have it checked soon. The repair usually costs about €40–300 in Estonia. The most common cause: steering wheel switches or their wiring.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.

Typical repair cost€40–300parts and labour in Estonia

What it means

There is a fault in the cruise control or its switches. It doesn't harm the engine, but cruise control may not work.

What you may notice

Cruise control won't engage or drops out
Engine light may be on

What could be wrong

1Steering wheel switches or their wiring
2Brake or clutch pedal switch
3Speed sensor signal
4Engine computer software

Repair difficulty: Easy

What you can check yourself

Check that the brake lights work properly. A faulty brake light switch often switches cruise control off. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

We check the switch states on the diagnostic tool
We check the pedal switches and wiring
We replace the faulty switch

Standard SAE description: Cruise Control Multi-Function Input "A"/"B" Correlation

Check the fuse · If a light, the horn, wipers, a socket or the fuel pump is dead, a blown fuse may be the cause.Fuse boxes by car →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0585 mean?

Cruise control switch: readings don't match ("A"). There is a fault in the cruise control or its switches. It doesn't harm the engine, but cruise control may not work.

Can I drive with code P0585?

OK to drive, but have it checked soon.

How much does it cost to fix P0585?

Roughly €40–300 in Estonia. The price depends on exactly what has failed and on the car.

How is P0585 fixed?

We check the switch states on the diagnostic tool. We check the pedal switches and wiring. We replace the faulty switch.

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.