P0564 code meaning
Cruise Control Multi-Function Input A Circuit
What P0564 means
Cruise control buttons are almost always a resistor ladder on one or two signal lines, each button giving its own voltage; the module reading it (GM and Saab from about 2010: the body module; FCA: steering column module or PCM) sends the button state to the engine module over CAN. CARB names cruise control as the example of an emission-neutral diagnosis – it is simply switched off – so GM lists all these codes as type C and Ford as non-MIL: no warning lamp, the engine runs normally. P0564 watches signal line A of the ladder: only voltage windows matching a button or no button are valid. GM sets it when the ratio sits in a gap between windows for over 0.5 s (2014: 2.5 s), the body module in the Saab 9-4X and 9-5 after an invalid voltage for 2 s. Cruise control is locked out for the ignition cycle.
P0564 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0564
- Cruise control cannot be switched on or switches off
- Cruise control locked out
- No check engine light, engine runs normally
Common causes of P0564
- Most likelyCruise or steering wheel switch faulty or dirty (moisture, worn contacts)
- PossibleClockspring or steering wheel connector with contact resistance
- PossibleSupply or signal line to the body module open or shorted
- Less likelyBody module
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 P0564 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. |
| 64 | The exact fault in that area. |
What to do next
- Note P0564 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 P0564
What does P0564 mean?
P0564 means "Cruise Control Multi-Function Input A Circuit". Cruise control buttons are almost always a resistor ladder on one or two signal lines, each button giving its own voltage; the module reading it (GM and Saab from about 2010: the body module; FCA: steering column module or PCM) sends the button state to the engine module over CAN. It is a generic code, so it means the same on every make.
Is it safe to drive with P0564?
P0564 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0564 fail an emissions test?
P0564 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 P0564 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0564 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.