P0593: Cruise Control Multi-Function Input B Circuit High
MediumPowertrainCruise Control
What does P0593 mean?
P0593 is a diagnostic trouble code indicating "Cruise Control Multi-Function Input B Circuit High". The ECU is reading a voltage that is above the expected range. This can be caused by a short to power in the wiring, a failed sensor, or a connector issue in the cruise control.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $500 AUD
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed cruise control sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
What should you do?
This code sits in a driver assistance system such as parking sensors, cruise control, tyre pressure monitoring or a camera. The car drives normally, but the assistance may be off or, worse, half working. Do not rely on it until it has been diagnosed.
Get a diagnosis for YOUR car
Code P0593 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.