P0574 – Meaning, Symptoms, Causes & How to Fix It

P0574 is an OBD-II trouble code that points to a problem with your vehicle’s cruise control system, specifically “Cruise Control System – Vehicle Speed Too High.” In simple terms, the engine computer (ECU/PCM) has detected a condition that doesn’t match the expected speed signal when cruise control is requested or active. While this code usually doesn’t affect basic drivability, it does mean cruise control may not work correctly or at all. Understanding what triggers P0574 helps you decide if it’s something you can inspect yourself or should leave to a professional.

What Does P0574 Mean?

P0574 is a generic powertrain code that indicates the ECU has seen an abnormal or unsafe vehicle speed condition related to cruise control operation. The system may detect that the vehicle speed is above the allowed threshold when cruise is engaged or requested, or that the speed signal is not behaving as expected.

Most of the time, this code points to a fault in the cruise control switch circuit, a problem with the brake switch, or an issue with the vehicle speed signal. The ECU disables cruise control as a safety measure and stores P0574 in memory.

Quick Reference

Code: P0574 – Cruise Control System, Vehicle Speed Too High
System: Cruise control / body electronics
Severity: Low for drivability, moderate for safety convenience
Typical symptom: Cruise control inoperative or intermittent
Common causes: Faulty cruise switch, brake switch, wiring, or speed signal issues

Real-World Example / Field Notes

In the shop, I usually see P0574 on vehicles where the owner complains, “Cruise just stopped working one day,” often after some other minor electrical issue. For example, a mid-2000s sedan came in with an intermittent cruise problem and a P0574 stored. The fix ended up being a worn brake pedal switch that was sending a flaky signal, telling the ECU the brakes were applied when they weren’t. The cruise control kept dropping out and eventually set the code. A simple switch replacement and basic wiring check cleared the issue completely.

Symptoms of P0574

Cruise control inoperative – Cruise will not set or engage at all.
Intermittent cruise operation – Cruise may work sometimes, then drop out unexpectedly.
Cruise light issues – The cruise indicator may flash, not illuminate, or behave oddly.
Check engine light – The MIL/SES lamp may come on and store P0574 in memory.
Unexpected cruise cancel – Cruise disengages when you hit bumps or lightly touch the pedal.
Other brake light problems – Brake lights staying on or not working can accompany this code.
No obvious drivability change – Engine power and shifting usually feel normal.

Common Causes of P0574

Most Common Causes

Faulty brake pedal switch – A worn or misadjusted brake switch can falsely signal “brakes applied,” forcing the ECU to cancel cruise and set P0574.
Defective cruise control switch – The steering wheel or stalk-mounted cruise buttons can fail internally or develop poor contacts.
Wiring or connector issues – Corroded, loose, or broken wiring in the cruise control or brake switch circuits can cause erratic signals.
Vehicle speed sensor (VSS) signal problems – A weak or noisy speed signal can make the ECU think the vehicle speed is out of range for cruise operation.
Clock spring (steering wheel spiral cable) faults – On vehicles with wheel-mounted cruise buttons, a failing clock spring can interrupt cruise switch signals.

Less Common Causes

Aftermarket accessories – Poorly installed remote starters, alarms, or trailer brake controllers can interfere with brake or speed circuits.
Faulty ECU/PCM – Rare, but an internal fault in the engine or body control module can misinterpret cruise or speed data.
Incorrect tire size or gearing changes – Extreme tire size changes can distort the speed signal and create cruise control issues on some vehicles.
Blown fuses or relay issues – A fuse that intermittently loses contact or a failing cruise control relay can cause sporadic operation.
Water intrusion or corrosion – Moisture in junction blocks, under-dash connectors, or steering column connectors can disrupt low-voltage cruise circuits.

Diagnosis: Step-by-Step Guide

To diagnose P0574 properly, you should have a basic OBD-II scan tool (ideally one that can read live data and Mode $06), a digital multimeter, and simple hand tools. Access to wiring diagrams or a repair manual for your specific vehicle is extremely helpful. If you’re not comfortable working around airbag components, leave steering wheel/clock spring checks to a professional.

Confirm the code and record data – Connect your scan tool, confirm P0574 is present, and note any other stored or pending codes (especially brake switch or VSS-related codes). Record freeze-frame data.
Check cruise control operation – With the engine running at a safe speed on a test drive, attempt to turn on and set cruise. Note if the cruise light comes on, flashes, or does nothing.
Inspect brake lights – Verify that the brake lights come on when you press the pedal and turn off when released. If they stay on, flicker, or don’t work, suspect the brake switch or its wiring.
Visually inspect brake switch – Look at the brake pedal switch above the pedal. Check for broken mounting, misalignment, or obvious damage. Gently wiggle the connector and see if brake lights flicker.
Test the brake switch electrically – Use a multimeter or a scan tool’s live data to confirm the switch changes state (ON/OFF) correctly when the pedal is pressed and released. Replace if readings are inconsistent.
Check cruise switch inputs – On a scan tool that supports it, monitor the cruise switch status (ON, SET, RESUME, CANCEL) while pressing the buttons. If the ECU doesn’t “see” your button presses, suspect the switch or clock spring.
Inspect wiring and connectors – Check harnesses at the brake switch, steering column, and under-dash junctions for corrosion, rubbed-through insulation, or loose pins. Repair any damaged wiring.
Verify vehicle speed signal – Use live data to monitor vehicle speed while driving. Look for erratic jumps or dropouts that don’t match actual speed. If present, check the VSS, wheel speed sensors (if applicable), and related wiring.
Clear codes and road test – After repairs or adjustments, clear P0574 and perform a road test using cruise control. If the code does not return and cruise works normally, the issue is resolved.
Advanced diagnostics (if needed) – If everything checks out but P0574 keeps returning, a deeper diagnosis with factory-level scan tools, Mode $06 data, and ECU pin testing may be required at a professional shop.

Pro tip: Many P0574 cases are fixed by a simple brake switch replacement or adjustment. If your brake lights act strange or your cruise drops out when you barely touch the pedal, start at the brake switch before chasing more complex issues.

Possible Fixes & Repair Costs

The exact fix for P0574 depends on what you or your technician find during diagnosis. Common repairs include replacing a faulty brake pedal switch, repairing or replacing the cruise control switch, fixing damaged wiring, or addressing a vehicle speed signal issue. Typical repair costs range from about $75–$150 for a basic brake switch replacement up to $300–$600 if clock spring or wiring repairs are needed. Costs vary with labor rates, parts quality (OEM vs aftermarket), and how much disassembly is required on your specific vehicle.

Replace brake pedal switch – Often a quick, low-cost repair; many switches are easily accessible.
Replace cruise control switch or stalk – Requires removing steering column covers and sometimes the steering wheel.
Repair wiring/connectors – Splicing in new wire, cleaning corrosion, or replacing damaged connectors.
Replace clock spring – More involved; airbag must be handled carefully and steering wheel removed.
Repair vehicle speed sensor issues – May involve replacing the VSS, cleaning connectors, or addressing ABS-related faults.
Reprogram or replace ECU/BCM (rare) – Only after confirming all other components are good.

Can I Still Drive With P0574?

In most cases, you can still drive with P0574 without damaging the engine or transmission. The main impact is loss or unreliability of cruise control. However, if the underlying issue involves the brake lights or brake switch, there can be a safety concern. Brake lights that stay on or don’t work properly increase your risk of being rear-ended and may be illegal. If you notice any brake light issues or odd pedal behavior along with P0574, treat it as a priority repair and avoid highway trips using cruise until it’s fixed.

What Happens If You Ignore P0574?

If you ignore P0574, you’ll likely just live without cruise control, but you may also be ignoring a developing electrical or brake light problem. Over time, a failing brake switch or corroded wiring can lead to more codes, intermittent stalling (on some models), or complete loss of brake lights. Addressing P0574 early usually keeps the repair simple and inexpensive.

Last updated: February 13, 2026

Key Takeaways

P0574 means the ECU detected an abnormal vehicle speed condition related to cruise control.
The most common culprits are the brake pedal switch, cruise switch, wiring issues, or a bad clock spring.
Driveability is usually normal, but cruise control may not work or may cut out unexpectedly.
Ignoring P0574 can hide brake light or electrical problems that affect safety.
Most repairs are relatively affordable when diagnosed early, often under a few hundred dollars.

Vehicles Commonly Affected by P0574

P0574 is a generic OBD-II code, so you can see it on many makes and models. In practice, it shows up frequently on:

GM vehicles – Chevrolet, GMC, Buick, and Cadillac trucks and sedans with steering wheel cruise buttons.
Ford and Lincoln – Especially older F-150s, Explorers, and sedans with known brake switch or clock spring issues.
Chrysler, Dodge, Jeep, Ram – Minivans, SUVs, and trucks where brake switch problems are fairly common.
Honda and Acura – Some models with worn brake switches or aftermarket accessory wiring added.
Toyota and Lexus – Occasionally seen when the cruise stalk or brake light switch begins to fail.
Hyundai and Kia – Compact cars and crossovers with steering wheel-mounted cruise controls.

Any vehicle with electronic cruise control can potentially log P0574, especially as components age or wiring is disturbed during other repairs or accessory installations.

FAQ

Can P0574 cause my car to stall or run poorly?

Usually no. P0574 mainly affects the cruise control system. The engine should run normally, and you typically won’t notice performance issues. If you do have stalling or rough running along with P0574, there may be additional codes or problems that need attention.

Is it safe to drive long distances with P0574 set?

As long as your brake lights work correctly and the vehicle drives normally, it’s generally safe, but you’ll be without reliable cruise control. Before a long trip, verify that the brake lights operate properly and that there are no other warning lights indicating braking or ABS issues.

How do I know if the brake switch is causing P0574?

Check your brake lights first. If they stay on, don’t come on, or flicker when you tap the pedal, the brake switch is a prime suspect. A scan tool that shows live brake switch status makes diagnosis easier. Replacing the switch is often inexpensive and resolves both brake light and cruise issues.

Can I clear P0574 myself with a code reader?

Yes, you can clear P0574 with any basic OBD-II scanner, but if the underlying fault is still present, the code will usually return once the ECU runs its checks again. Clearing the code without fixing the cause is only a temporary reset, not a repair.

Do I need a dealer to fix P0574, or can an independent shop handle it?

Most independent repair shops can diagnose and fix P0574 without any problem. The systems involved—brake switch, cruise switch, wiring, and speed signal—are standard across many vehicles. A dealer may be needed only if the repair requires ECU reprogramming or brand-specific software updates.

P0574 – Cruise Control System Vehicle Speed Too High