Cruise Control Idle Input Circuit Malfunction
Indicates an issue with the cruise control idle input circuit.
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 car's computer is not getting the right signal from the cruise control system that tells it if the throttle should be adjusted for idling, which can affect how the cruise control works.
What the computer is actually seeing
The engine control module (ECM) looks for a specific voltage signal (usually around 0.5V to 1.5V) from the idle input circuit to determine if the throttle should close for cruise control operation. If it sees a voltage outside of the expected range, it triggers the P0575 code.
What a healthy reading looks like
Voltage from the cruise control idle input should typically be between 0.5V and 1.5V when the vehicle is at idle.
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. Check the connections at the cruise control switch and inspect for corrosion or damage. If okay, go to step 2.
- 22. Measure the voltage at the idle input circuit with the key on, engine off. Expected range is 0.5V - 1.5V. If out of range, check the wiring. If okay, go to step 3.
- 33. Check the accelerator pedal position sensor for proper operation. Check voltage output similar to idle input circuit. If faulty, replace.
- 44. If wiring is good and sensors are working, suspect the ECM may be malfunctioning.
Common causes
- Faulty cruise control switch
- Wiring issues in the cruise control circuit
- Bad accelerator pedal position sensor
- Malfunctioning ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but the cruise control won't function properly, so fix it soon.
Will this code come back after clearing it?
It can return if the root cause isn't fixed, so follow the diagnostic steps.
Why does this code appear alongside other codes?
Multiple codes can indicate related systems failing or issues with the communication between them.
Working a real vehicle right now?
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