P0595 indicates the vehicle's computer has detected a lower-than-expected voltage signal in the cruise control servo control circuit. This fault typically prevents the cruise control system from engaging or maintaining a set speed. The issue usually lies within the servo actuator, wiring, or electrical connections rather than the main computer.
The electric motor responsible for adjusting throttle position may have an internal short or mechanical failure.
Wires in the servo circuit may be frayed, burnt, or shorted to ground near the engine bay.
Moisture or oxidation at the servo connector can cause high resistance or low voltage signals.
A protective fuse in the power circuit may have blown due to a surge or short condition.
The steering wheel or stalk switch may have internal resistance issues affecting the control circuit.
Internal driver circuit failure within the computer is rare and should only be considered after all external components are verified.
No, PCM failure is rare for this code; the servo actuator or wiring is the usual cause.
Yes, the vehicle drives normally, but the cruise control function will be disabled.
No, the underlying electrical fault must be repaired or the code will return.