---
id: faq-0081
title: "What should I do if my check engine light comes on?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlecdjrnaperville.com"
tags: ["diagnostics", "warning-lights", "engine-health"]
questions:
  - "My check engine light is on-what does it mean?"
  - "Is it safe to drive with a check engine light?"
  - "How do I fix a check engine light?"
related: [diagnostics-scan, emissions, engine-repair]
dealer: Castle CDJR of Naperville
---

A check engine light means your vehicle's onboard diagnostic system detected an issue with the engine, emissions, or transmission. It could be something minor (loose gas cap) or more serious.

**What to do:**
1. Don't ignore it-get a diagnostic scan as soon as possible.
2. If the light is steady, it's usually safe to drive to a service facility.
3. If the light is flashing, stop driving immediately; flashing indicates a serious engine problem.

Our Service Team uses advanced diagnostic equipment to read the fault code and identify the root cause. We'll explain the issue and recommend the best repair path-whether it's a simple fix or something more involved.

Don't guess what the problem is. Let Castle CDJR of Naperville's experts get to the bottom of it. Call **(630) 864-6683** today to schedule your diagnostic scan.