What are the common causes of P0585?

Worn cruise control switches. Corrosion in the switch wiring. A bad vehicle speed sensor. A faulty PCM. An incorrectly adjusted switch pack.

Watch inputs A and B together on a scan tool. Press each button and compare the two inputs. Inspect the switch wiring for corrosion. Check the vehicle speed sensor signal. Replace the switch pack if A and B disagree. Clear the code and retest.

P0585

Cruise Control Multi-Function Input A/B Correlation

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0585 means Cruise Control Multi-Function Input A/B Correlation.

Check these first

Worn cruise control switches
Corrosion in the switch wiring
A bad vehicle speed sensor
A faulty PCM
An incorrectly adjusted switch pack

What to do next

Watch inputs A and B together on a scan tool
Press each button and compare the two inputs
Inspect the switch wiring for corrosion
Check the vehicle speed sensor signal
Replace the switch pack if A and B disagree
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.