Code Definition

P0593 — Cruise control multifunction switch signal hjgh - Circuit B

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0593

P0593 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0593 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0593 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This fault code is set when the engine control module (ECM) or the body control module (BCM) detects a higher than normal voltage signal from Circuit B of the cruise control multifunction switch. The multifunction switch is crucial for the operation of the cruise control system, allowing the driver to activate, set, adjust, and deactivate cruise control. A high signal in Circuit B typically indicates an electrical fault, such as a short to power in the switch circuit. This can result in irregular or impaired functionality of the cruise control system.

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