Code Definition

P0596 — Cruise control servo circuit high

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

About P0596

P0596 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 P0596 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 P0596 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 in the cruise control servo circuit. The cruise control servo is a critical component in certain types of cruise control systems, particularly those that use a mechanical linkage to control the throttle. A high voltage condition in the servo circuit can indicate an electrical fault such as an open circuit or poor grounding, which might impair the servo's ability to accurately control the throttle as per the cruise control settings, potentially leading to malfunction...

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