Cruise Control Switch Input Fault
The cruise control switch signal is inconsistent or missing.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The cruise control system isn't getting reliable information from the switch that activates it, which means it might not work properly or at all.
What the computer is actually seeing
The powertrain control module (PCM) is checking for a valid signal from the cruise control switch. It expects a specific voltage level when the switch is activated, typically around 0V when off and close to the battery voltage (around 12V) when engaged. If it sees irregular signals or missing signals, it triggers the P0564 code.
What a healthy reading looks like
0V when off, 12V when on (depending on system design).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the cruise control switch. Check for physical damage or corrosion. If damaged, replace.
- 22. Check wiring and connectors from the cruise control switch to the PCM. Look for frayed wires or poor connections. Repair any issues found.
- 33. Measure the voltage at the cruise control switch while operating. Ensure that you see 0V when the switch is off and around 12V when on. If not, replace the switch.
- 44. Inspect the brake light switch. It must function correctly to keep the cruise control engaged. Test its operation and adjust or replace as necessary.
- 55. Clear the code and test drive the vehicle to see if the code returns. If it does, consider checking the PCM for updates or faults.
Common causes
- Faulty cruise control switch
- Wiring issues or damaged connectors
- PCM software issues
- Faulty brake light switch (cutting off cruise)
- Intermittent shorts or opens in cruise control circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
Yes, but the cruise control won't work properly, so you should be cautious and use manual throttle control.
Will this problem come back after repairs?
If the root cause is fixed, it shouldn't come back. If wiring is intermittently faulty, it may return.
Why does this code pair with other codes?
Other codes may indicate additional faults in the cruise control system or related components affecting its operation.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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