Code Definition

P0594 — Cruise control servo open circuit

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

About P0594

P0594 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 P0594 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P0594 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 triggered when the engine control module (ECM) or the body control module (BCM) detects an open circuit condition in the cruise control servo. The cruise control servo is a key component in traditional cruise control systems, particularly those using a cable-driven mechanism to control the throttle based on the cruise control settings. An open circuit in the servo's electrical connections implies a break or disconnection in the wiring, which can prevent the servo from receiving or sending signals, thus leading to a failure in the cruise control system's ability to maintain o...

Join TaT to view the complete code information and diagnostic details.

Quick Facts