OBD-II Code P0595: What It Is, Symptoms, Causes & How to Fix It with iCarsoft CR Ultra P
If your cruise control suddenly stops working and a scan pulls up OBD-II Code P0595—defined as “Cruise Control Servo Control Circuit Low”—you’re dealing with an electrical issue that disrupts your vehicle’s cruise control system. For frequent highway drivers, losing cruise control isn’t just inconvenient—it can make long trips tiring and less fuel-efficient. But you don’t need to pay a mechanic to diagnose the problem: this guide breaks down everything you need to know about P0595, plus why the iCarsoft CR Ultra P diagnostic tool is the DIYer’s go-to solution to detect, troubleshoot, and clear this error code for good.
What Is OBD-II Code P0595?
OBD-II codes are universal alerts from your vehicle’s Engine Control Module (ECM) or Body Control Module (BCM) when electrical or system malfunctions occur. Specifically, P0595 indicates a “low” voltage issue in the cruise control servo’s control circuit—the electrical path that powers and communicates with the cruise control servo motor.
The cruise control servo is a small motor that adjusts the throttle (or brake, in some systems) to maintain your set speed. A “low circuit” means the ECM/BCM detects voltage below the acceptable range, preventing the servo from operating properly. This can stem from wiring problems, a faulty servo, or power supply issues—all of which shut down cruise control functionality.
Common Symptoms of P0595
Watch for these key signs that P0595 is affecting your vehicle:
- Cruise control fails to activate (buttons on the steering wheel do nothing)
- Cruise control light flashes or stays off on the dashboard
- Intermittent cruise control operation (works sometimes, then cuts out)
- Check Engine Light (MIL) illuminates (solid, rarely flashing)
- Reduced throttle response in some cases (if the servo circuit overlaps with throttle control)
- Dashboard warning messages related to cruise control (on newer vehicles)
- Inability to maintain set speed (if cruise control briefly activates then shuts down)
Top Causes of P0595
Pinpointing the root cause of P0595 is straightforward with the right tool. Common triggers include:
- Damaged, frayed, or shorted wiring in the cruise control servo circuit
- Faulty cruise control servo motor (internal electrical failure)
- Loose, corroded, or disconnected electrical connectors for the servo
- Blown fuse or faulty relay in the cruise control power supply
- Malfunctioning ECM/BCM (rare, but possible if wiring and servo check out)
- Low vehicle battery voltage (insufficient power to the servo circuit)
- Water or debris damage to the servo or wiring (common in underhood or underbody locations)
Why the iCarsoft CR Ultra P Is Ideal for P0595
Not all OBD scanners can accurately diagnose cruise control circuit issues like P0595. The iCarsoft CR Ultra P is a professional-grade tool designed to handle electrical and control system malfunctions—optimized to pinpoint P0595’s root cause with precision. Here’s why it stands out:
Reads not just the code, but subcodes and real-time circuit voltage data to confirm if the issue is wiring, servo, or power supply.
After fixing the circuit or replacing the servo, reset the Check Engine Light and clear P0595 in seconds—no guesswork.
Works with most OBD-II compliant cars, trucks, SUVs, and vans (1996+ US models, 2000+ EU/Asian models) from brands like Ford, Chevrolet, Toyota, Honda, BMW, Mercedes-Benz, and more.
Monitors cruise control servo voltage, fuse status, and ECM signals in real time to verify your repair worked.
Offers circuit continuity checks and voltage readings—critical for diagnosing low-circuit issues like P0595.
Plug-and-play operation, large LCD screen, and step-by-step prompts—no electrical expertise required.
Built with rugged materials to withstand garage use, backed by iCarsoft’s customer support and warranty.
FAQ: Everything You Need to Know About P0595 & iCarsoft CR Ultra P
P0595 indicates a low-voltage issue in the cruise control servo’s control circuit—preventing the servo from operating and disabling cruise control.
Yes—P0595 only affects cruise control, not basic vehicle operation. But it’s inconvenient for long drives and should be fixed to restore functionality.
Disconnecting the battery resets the Check Engine Light temporarily, but P0595 will return unless you fix the circuit or servo. A tool like the iCarsoft CR Ultra P is needed to identify the root cause.
It’s compatible with most OBD-II compliant vehicles (1996+ US, 2000+ EU/Asian) including cars, trucks, SUVs, and vans. Check the product page for full brand/model coverage.
No! It’s plug-and-play: connect to your vehicle’s OBD-II port (under the dashboard), turn on the ignition, and follow on-screen prompts to scan for P0595.
Yes—if you repair the low circuit (e.g., fix wiring, replace servo/fuse). The tool resets the ECM/BCM, so the code won’t return if the issue is resolved.
Professional diagnostics for P0595 cost $100–$250, plus $150–$500 in repair fees. The iCarsoft CR Ultra P pays for itself after one use and works for future electrical issues.
Purchase directly from the official iCarsoft website for genuine quality, worldwide shipping, and a 1-year warranty.
Final Thoughts: Don’t Let P0595 Ruin Your Long Drives
OBD-II Code P0595 is a minor but annoying issue—if you have the right tool to fix it. The iCarsoft CR Ultra P takes the guesswork out of diagnosing and clearing this cruise control circuit error, saving you time, money, and the frustration of non-functional cruise control. Whether you’re a frequent road tripper, DIY enthusiast, or just want to avoid unnecessary mechanic visits, this tool is a must-have for handling P0595.
Ready to restore your cruise control and make long drives enjoyable again? Grab the iCarsoft CR Ultra P today and take control of your vehicle’s electrical systems!
Disclaimer: This guide is for informational purposes only. Always consult your vehicle’s service manual or a certified mechanic before electrical/cruise control system repairs. iCarsoft is not responsible for damage from improper tool use or vehicle maintenance.