P0585 Technical Description
Cruise Control Input Circuit Signal Correlation Error
If you’re staring down the dashboard at a P0585 trouble code, you’re probably looking for clear answers on what it means and how to resolve it.
This guide will provide you with a comprehensive understanding of the code, its symptoms, causes, and effective fixes.
Having wrestled with this issue in a variety of vehicles, I’m well-acquainted with the quirks of the P0585 code.
In this article, we’ll delve specifically into how this trouble code can affect your vehicle’s performance and the step-by-step process you can take to not just diagnose but effectively solve the problem.
Time to get our hands dirty and tackle this head-on.
Key Takeaways
- Code Definition: P0585 indicates a “Cruise Control Input Circuit Signal Correlation Error.”
- Symptoms: Includes erratic cruise control operation, possible Check Engine light, and vehicle entering limp mode.
- Common Causes: Faults may occur in cruise control switches, wiring, the cruise control module, the speed sensor, or the ECM.
- Diagnostic Steps: Begin with a thorough diagnostic scan followed by a visual inspection of related components.
- Repair Strategies: Address issues with switches, wiring, sensors, and modules as needed; update or replace ECM if necessary.
- Importance of Accurate Diagnosis: Correctly identifying the underlying issue ensures effective repairs and prevents further complications.
Table of ContentsShow
What Does P0585 Trouble Code Mean?
If your car’s diagnostic system has thrown up the P0585 trouble code, here’s the lowdown without beating around the bush.
This code signals an issue with the cruise control system, specifically pointing to a malfunction in the speed control input circuit. In plain English, your vehicle is telling you there’s a hiccup with the bits and bobs that manage how fast your car goes when cruise control is doing its thing.
So, what’s happening under the hood?
The cruise control system works with various sensors and a control module to maintain your set driving speed without you needing to keep a foot on the accelerator.
When P0585 pops up, it means the system’s main brain—the Engine Control Module (ECM) or Powertrain Control Module (PCM)—has detected an inconsistent signal between the cruise control input and output signals.
Why should you care?
First off, it affects your cruise control’s performance—ranging from it being finicky to downright refusing to engage. Secondly, it’s a signal that part of your driving system isn’t communicating properly, which could lead to further issues down the road.
For our speed-loving friends out there who rely on cruise control for those long, open-road adventures, spotting and sorting out this code early can save you a headache later.
Plus, addressing it promptly can prevent any potential safety issues that might arise from a malfunctioning cruise control system.
So, grab your tools, or schedule a visit to your mechanic, and let’s get that cruise control cruising smoothly again.
P0585 Trouble Code Symptoms
Experiencing the P0585 trouble code can lead to several noticeable symptoms in your vehicle, including:
- Inconsistent cruise control operation
- Cruise control failing to engage or disengage properly
- Erratic vehicle speed when cruise control is activated
- Possible Check Engine light illumination
- In some cases, the vehicle may enter “limp” mode to prevent further damage
P0585 Trouble Code Causes
The P0585 trouble code can be triggered by a few distinct issues, which are essential to identify for effective troubleshooting:
- Faulty cruise control switches
- Wiring issues related to the cruise control system, including shorts or disconnections
- Faulty cruise control module
- Problems with the vehicle’s speed sensor
- ECM (Engine Control Module) issues affecting cruise control functionality
How To Fix A P0585 Trouble Code
Resolving the P0585 trouble code involves a systematic approach to diagnosing and repairing issues related to the cruise control system. Here’s how you can pinpoint and fix the problem:
1. Diagnostic Scan
Begin by using an OBD-II scanner to confirm the presence of the P0585 trouble code and check for any other related codes that might provide additional insight.
2. Visual Inspection
Inspect all cruise control-related wiring and connectors. Look for signs of damage, wear, or loose connections that could disrupt signals. Ensure that wiring harnesses are secure and free from corrosion.
3. Switch Testing
Test the functionality of the cruise control switches. Faulty switches can often be the culprit and may need replacement if they fail tests.
4. Speed Sensor Check
Since the speed sensor plays a crucial role in the cruise control system, verify its operation with a multimeter or a specialized diagnostic tool. Replace the sensor if it shows faulty readings.
5. Cruise Control Module Evaluation
Examine the cruise control module for signs of damage or failure. This module can sometimes fail internally and may require replacement.
6. ECM Check
Lastly, consider the condition and software status of the Engine Control Module. An outdated or malfunctioning ECM can falsely trigger the P0585 code. A software update or ECM replacement might be necessary.
After addressing the specific issues found during these steps, clear the trouble code from the OBD system using a scanner and conduct a road test to ensure that the cruise control system functions correctly and the code does not reappear.
Conclusion
Now that you’re equipped with the knowledge about what a P0585 trouble code means and the steps to fix it, you’re ready to tackle it head-on.
Have you encountered this issue before? What was your fix?
Feel free to share your experiences or tips in the comments below—let’s help each other out!
