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P0596 is a diagnostic trouble code (DTC) for "Cruise Control Servo Control Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0596 diagnostic trouble code is an indication that there is an issue with the cruise control servo control circuit.
Related Trouble Codes:
When the cruise control feature is in use, vehicle speed is automatically controlled by the Powertrain Control Module (PCM), the cruise control module, and the servo control unit. The Powertrain Control Module (PCM) receives a signal from the cruise control module as to the desired speed of the vehicle. The servo control unit receives information from the Powertrain Control Module (PCM) and cruise control module as to the required position of the throttle plate. The servo control unit will then open or close the throttle plate to maintain the desired speed of the vehicle. The P0596 diagnostic trouble code is stored when the cruise control module is not sending the proper speed signal to the Powertrain Control Module (PCM) necessary to control vehicle speed and the cruise control servo control unit is giving an abnormal voltage or resistance reading.
Faulty cruise control servo control unit
Faulty cruise control servo control wires that are frayed, broken, or shorted
Faulty cruise control servo control connectors that are damaged or corroded
Liquid spilled onto the cruise control switch
The most common mistake made with this code is overlooking blown fuses. Other components should not be replaced without first inspecting the fuses to ensure they are working properly. When components are replaced unnecessarily, it is a waste of time and money and may not resolve the problem.
A diagnostic trouble code is normally considered serious when it causes driveability issues or a change in performance.When this code is stored in the Powertrain Control Module (PCM), the cruise control system will be disabled. This may be considered an inconvenience, but is not considered serious. The P0596 diagnostic trouble code should however, be diagnosed and repaired as soon as possible.
Replace cruise control servo control unit
Repair or replace cruise control servo control wiring that is frayed, broken, or shorted
Repair or replace cruise control servo control connectors that are damaged or corroded
Liquid spilled on the cruise control buttons has been known to cause the P0596 diagnostic trouble code. Other common causes are faulty wiring and blown fuses.
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