P1586 is a manufacturer-specific OBD-II diagnostic trouble code. Because it is manufacturer-specific, its exact definition depends on the vehicle application, often relating to the cruise control system.
The exact application must be verified before diagnosis. The code indicates a detected condition in the relevant circuit or module, but testing is required to identify the root cause.
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Key Takeaways
- P1586 is a manufacturer-specific code, meaning its exact definition varies by automaker and vehicle application.
- On many Toyota, Volkswagen, and Hyundai applications, it indicates a malfunction within the cruise control system or its related circuits.
- Possible causes include a faulty cruise control switch, vehicle speed sensor issues, or a defective brake light switch.
- Diagnosis requires verifying the exact factory definition and testing the relevant switches, sensors, or control modules.
P1586 Code Description and Implications
P1586 is a manufacturer-specific powertrain code. Because the second digit is “1”, the definition is controlled by the automaker rather than the SAE standardized list.
Some Toyota and Lexus applications: P1586 indicates a general malfunction or signal fault within the cruise control system.
Certain Volkswagen and Audi applications: P1586 may indicate a fault with the cruise control switch, the steering wheel control module, or the vehicle speed signal provided to the cruise control system.
Some Hyundai and Kia applications: P1586 can relate to a cruise control system circuit fault or a brake switch signal correlation error that disables cruise control.
When the control module detects an unexpected signal or circuit condition in the cruise control system, it sets this fault code. Because this is a manufacturer-specific code, the exact definition and diagnostic steps vary by automaker.
Common Causes of the P1586 Code
Possible causes depend entirely on the specific vehicle application.
For cruise control switch applications, causes include a failed steering wheel switch, damaged clock spring wiring, or corroded connectors.
For vehicle speed signal applications, causes may include a faulty vehicle speed sensor, damaged wiring, or a failed instrument cluster communication circuit.
A misadjusted or failing brake light switch can also trigger cruise control system codes, as the module relies on the brake signal to disengage the system safely.
Symptoms Associated With P1586
The primary symptom is the cruise control system becoming inoperative or refusing to engage.
The cruise control indicator light on the dashboard may fail to illuminate, flash continuously, or display a warning message.
An illuminated check engine light is also common when this code is stored.
Drivability and engine performance are typically unaffected, as the fault is isolated to the cruise control circuit.
Diagnosing the P1586 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year.
Technicians inspect the cruise control switch and steering wheel clock spring for continuity and proper resistance.
Live data is monitored to verify if the control module correctly recognizes the vehicle speed sensor input and the brake switch status when the pedal is pressed.
Wiring harnesses between the switch, speed sensor, and control module are checked for opens, shorts, or corrosion.
Repairing the P1586 Issue
Repairs follow the confirmed diagnosis for the specific application.
If the cruise control switch or clock spring fails electrical tests, replacing the confirmed failed component is required.
If a brake light switch is misadjusted or failing, replacing or adjusting the switch resolves the correlation fault.
If wiring damage is found, repairing the harness and clearing the code resolves the electrical fault.
Cost Considerations for P1586 Repairs
Repair costs vary depending on the underlying fault and the vehicle application.
Replacing a steering wheel cruise control switch or a brake light switch involves standard parts and moderate labor.
If the repair requires replacing the clock spring or a dedicated cruise control module, parts costs increase.
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Prevention Strategies for Future Occurrences
Inspecting steering wheel wiring and clock spring connections during airbag or steering column service can help identify developing damage.
Ensuring the brake light switch is properly adjusted and functioning prevents false signals that can confuse the cruise control module.
Troubleshooting Tips and Best Practices
Never assume a manufacturer-specific code has a universal meaning. Always verify the exact factory service information for your specific vehicle.
Before replacing the cruise control switch, verify that your brake lights operate correctly, as a faulty brake switch will intentionally disable the cruise control system.
If P1586 is accompanied by vehicle speed sensor codes, the diagnosis must address the speed signal fault rather than the cruise control switch.
More OBD-II Codes
| P1565 | P1555 | P1550 | P1546 |
| P1542 | P1531 | P1587 | P1588 |
| P1600 | P1602 | P1603 | P1604 |
| P0500 | P0501 | P0502 | P0504 |
| P0505 | P0506 | P0513 | P0520 |
| P0521 | P0522 | P0523 | P0524 |
Frequently Asked Questions
Is P1586 a generic OBD-II code?
No. P1586 is a manufacturer-specific code, meaning its exact definition and diagnostic procedure depend entirely on the vehicle’s make, model, and application.
Can I drive my vehicle with a P1586 code?
Yes, you can generally drive the vehicle, as cruise control faults do not affect engine drivability. However, the cruise control system will remain disabled until repaired.
Will a P1586 code cause my cruise control to stop working?
Yes. This code specifically indicates a fault in the cruise control system or its related input signals, causing the module to disable the feature for safety.
Does P1586 always mean the cruise control switch is broken?
No. The code often points to a faulty brake light switch, a damaged steering wheel clock spring, or a vehicle speed sensor signal issue.
How do I clear a manufacturer-specific P1586 code?
Clearing the code requires fixing the underlying electrical or switch fault. Simply using a scan tool to erase the code will not repair the root cause.
What Should You Do About the P1586 Code?
Confirm the exact factory definition for your specific vehicle, then follow the applicable manufacturer diagnostic procedure for the relevant system and components.
Because P1586 is manufacturer-specific, testing the exact switches, sensors, or control modules identified by the factory service information is required to find the root cause.
Once the fault is confirmed, perform the necessary repairs and verify the fix by clearing the codes and testing the cruise control operation.
