P0595
UniversalCruise Control Servo Control Circuit Low
Low SeverityThis code indicates that the engine control module (ECM) has detected a low voltage condition in the circuit controlling the cruise control servo or module. This typically means the cruise control system will become inoperable, though it does not usually affect the drivability or safety of the vehicle.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is turned off and the battery is disconnected before performing any electrical repairs to prevent accidental shorts or injury. Use appropriate safety gear such as gloves and eye protection.
Common Symptoms
- Cruise control system is inoperable
- Check Engine Light (CEL) illuminated
Common Causes
- Faulty cruise control servo or module
- Open or short circuit in the cruise control servo control circuit wiring
- Corroded or loose electrical connectors
- Faulty Engine Control Module (ECM) (less common)
Frequently reported on: General/Universal
Diagnostic Steps
- Visually inspect the wiring and connectors leading to the cruise control servo/module for any signs of damage, corrosion, or looseness.
- If accessible, test the voltage at the cruise control servo control circuit using a multimeter, comparing readings to manufacturer specifications.
- Check relevant fuses in the fuse box that supply power to the cruise control system.
- If no obvious wiring or fuse issues are found, consider testing the cruise control servo or module itself if diagnostic procedures are available.
- Clear the code and retest the system after any repairs or replacements.
👨🔧 When to Call a Professional
If you lack experience with electrical diagnostics or circuit testing, it is highly recommended to consult a professional mechanic to avoid further damage to the vehicle's electrical system.
Commonly Asked Questions
Will a P0595 code prevent my car from starting?
No, a P0595 code specifically relates to the cruise control system and will not prevent your vehicle from starting or driving normally.
Can I drive with a P0595 code?
Yes, you can typically drive with a P0595 code, as it only affects the cruise control functionality. However, it's always best to address any diagnostic trouble codes promptly.
What is the cruise control servo?
The cruise control servo is a component that either directly controls the throttle (in older vehicles) or is part of a module that sends signals to the engine control unit to maintain a set speed.
Is troubleshooting a P0595 code difficult?
Diagnosing a P0595 code can be moderately difficult as it often involves electrical circuit testing to pinpoint an open, short, or component failure within the cruise control system.
Do I need special tools to fix this code?
You will likely need a multimeter for electrical testing and possibly a scan tool to clear the code and check live data. Basic hand tools are also required for access and replacement.