What does code P0596 mean?

Q: What does code P0596 mean?

Cruise Control Servo Control Circuit High. P0596 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the cruise control servo control circuit, which is the command wire the PCM uses to modulate the servo. The PCM expects a specific voltage range on this circuit and sets the code when the signal exceeds the upper threshold, pointing to a short to voltage, an open circuit, or a faulty servo.

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0596

P0596Cruise Control Servo Control Circuit High

P0596 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the cruise control servo control circuit, which is the command wire the PCM uses to modulate the servo. The PCM expects a specific voltage range on this circuit and sets the code when the signal exceeds the upper threshold, pointing to a short to voltage, an open circuit, or a faulty servo.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.