P0570 Cruise Control Accel Signal Malfunction

P0570 points to a cruise control accel signal malfunction. The controller sees a missing, stuck, or invalid acceleration request from the cruise switch circuit.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not diagnose throttle or servo output first when the cruise accel request itself is not valid.

Symptoms of P0570

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0570

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Review accel switch state, resume and set inputs, brake switch data, vehicle speed, cruise enable status, and freeze-frame data.
Inspect steering wheel switch contacts, clockspring circuits, column connectors, shared reference or resistor wiring, and moisture intrusion.
Operate the accel input while monitoring live data to verify the signal reaches the controller only when commanded.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.