---
id: faq-0080
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.castlecadillacmchenry.com"
tags: ["diagnostic", "warning-lights", "service"]
questions:
  - "What does the check engine light mean?"
  - "Is it safe to drive with check engine light on?"
  - "How do I fix the check engine light?"
related: [diagnostic-service, warning-lights]
dealer: Castle Cadillac McHenry
---

A check engine light means your vehicle's onboard computer detected an emissions or engine issue. It could be something minor like a loose gas cap or serious like a catalytic converter problem-the only way to know is a diagnostic scan.

It's generally safe to drive, but don't ignore it. Delaying diagnosis can turn a small fix into an expensive repair. Get it scanned as soon as possible, especially if the light is flashing (which means stop driving immediately).

Castle Cadillac McHenry's Service team uses factory-level diagnostic equipment to read your vehicle's codes and pinpoint the exact issue. We'll explain what's wrong in plain language and give you honest options. **Call (779) 265-4427** right away to schedule a diagnostic appointment.