P0585 code meaning
Cruise Control Multi-Function Input A/B Correlation
What P0585 means
Cruise control buttons form a resistor ladder on one or two signal lines, each button giving its own voltage window. FCA uses two lines with offset windows – signal 1 is input A, signal 2 input B – and both must report the same button; GM evaluates the ratio to the reference. Any fault locks out cruise control; CARB treats this as emission-neutral, and GM and Ford set these codes without warning lamp. P0585 means inputs A and B contradict each other although both voltages are valid – one reports a button, the other rest or another button. Documented only by FCA: a 2022 bulletin traces it to a SET+ button stuck by a badly seated trim, another names oxidised steering wheel contacts. FCA gives no thresholds; GM does not use P0585.
P0585 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0585
- Cruise control not engaging or cutting out, button sticking
- Cruise control locked out
- No check engine light
Common causes of P0585
- Most likelyButton stuck mechanically (trim, dirt)
- PossibleIncreased contact resistance on one line (clockspring or column module connector)
- PossibleButton block faulty internally
- Less likelyClockspring faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cruise control switchClockspringSwitch wiringBody control module
What each part of P0585 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 85 | The exact fault in that area. |
What to do next
- Note P0585 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0585
What does P0585 mean?
P0585 means "Cruise Control Multi-Function Input A/B Correlation". Cruise control buttons form a resistor ladder on one or two signal lines, each button giving its own voltage window. It is a generic code, so it means the same on every make.
Is it safe to drive with P0585?
P0585 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0585 fail an emissions test?
P0585 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0585 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. This is a job for a workshop.
Will P0585 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.