Check Engine Light On? What a Steady vs Flashing Warning Can Mean

A flashing check engine light needs attention right away, and a steady one means the vehicle should be checked soon. The 2026 owner's manuals for the Ram 1500 and Jeep Grand Cherokee, published by FCA Canada, say a flashing light can warn of serious conditions and that "Immediate service is required."

For a flashing check engine light, CAA-Quebec's guide to dashboard warning lights advises stopping the vehicle in a safe spot and having it towed.

This guide is general information and does not diagnose any vehicle. Your own vehicle's owner's manual is the authority on its warning lights.

Where this guide says "the manuals," it means the 2026 Ram 1500 and Jeep Grand Cherokee manuals from FCA Canada.

On a Gardiners Road errand or a run along Highway 401, two questions decide what happens next when the check engine light comes on: is it flashing, and is the vehicle running as it should?

Key Takeaways

• A flashing check engine light calls for immediate service. FCA Canada's 2026 Ram 1500 and Jeep Grand Cherokee manuals warn that when the light flashes, "severe catalytic converter damage and power loss will soon occur."

  
  

• A steady check engine light means the vehicle should be checked soon. The 2026 Ram 1500 and Grand Cherokee manuals say to have the vehicle serviced "if the light stays on through several typical driving styles," and that in most situations the vehicle will drive normally.

  
  

• Safety comes before a service request when the check engine light flashes. CAA-Quebec's guide advises stopping in a safe spot and having the vehicle towed, and an online service request is not emergency help.

  
  

• A flashing check engine light is urgent, even though the 2026 Ram 1500 and Grand Cherokee manuals list it under "Yellow Warning Lights." The manuals still call for immediate service when the light flashes.

  
  

• At Jim Thompson Chrysler in Kingston, a service request for a check engine light is not yet an appointment. Our service team contacts you to confirm availability after your request comes in.

  
  

What Does the Check Engine Light Actually Tell You?

The check engine light is the warning light for a vehicle's onboard diagnostic system. The manuals call it the Malfunction Indicator Light (MIL) and say it is part of a system called OBD II that "monitors engine and automatic transmission control systems."

The manuals also say the check engine light comes on when the ignition is in the ON/RUN position before the engine starts, and that if it does not, you should have the condition checked promptly.

For any vehicle other than a 2026 Ram 1500 or Jeep Grand Cherokee, that vehicle's own owner's manual is the authority on its check engine light.

What Does a Steady Check Engine Light Mean?

A steady check engine light means the vehicle should be checked soon. The manuals say "In most situations, the vehicle will drive normally and will not require towing."

Conditions such as a loose or missing gas cap or poor quality fuel may turn the check engine light on after engine start, according to the manuals. CAA-Quebec's guide says to "Ensure the gas cap is tightened until it clicks," a check that applies to vehicles that have a fuel cap.

A steady check engine light that does not go out still needs a visit: the manuals say the vehicle should be serviced "if the light stays on through several typical driving styles." The manuals' caution box adds that prolonged driving with the light on could damage the vehicle control system and affect fuel economy and driveability.

If a steady check engine light comes with the vehicle running poorly, treat it as more serious. CAA Niagara's guide to dashboard warning symbols says to turn off your vehicle and have it towed if you have performance problems.

What Does a Flashing Check Engine Light Mean, and What Should You Do?

A flashing check engine light signals a serious condition, so stop somewhere safe first and then have the vehicle serviced right away. The manuals' own four words are about the service: "Immediate service is required."

When the engine is running, a flashing check engine light warns of conditions that "could lead to immediate loss of power or severe catalytic converter damage," according to the manuals. CAA Niagara's guide adds that "A blinking light could indicate a severe engine misfire."

Make the Situation Safe First

With a flashing check engine light, safety comes before any plan for service. CAA-Quebec's guide says to "Stop the vehicle in a safe spot" and have it towed.

If anything about the vehicle seems unsafe, such as smoke or a strange smell, stop in a safe place and get help.

Call a roadside assistance provider if the vehicle needs a tow, or emergency services if anyone is in danger. Our online service request form is not emergency help.

Choose Where You Stop

Heat is the reason to think about where you stop with a flashing check engine light. The manuals warn that a malfunctioning catalytic converter can run hotter than normal and can start a fire if you drive slowly or park over flammable material such as dry plants, wood or cardboard.

A paved area clear of dry grass, such as a parking lot or a rest stop, is safer ground to stop on than a grassy shoulder, wherever one is within safe reach.

Then Arrange Service Promptly

Once everyone is safe, a vehicle with a flashing check engine light still needs service "as soon as possible," the phrase the manuals use when the light flashes.

If the vehicle is towed, tell the tow operator which service department it is going to, and call that department so the team there knows it is coming.

Is the Check Engine Light a Yellow or a Red Warning Light?

The check engine light is listed under "Yellow Warning Lights" in the manuals, while CAA Niagara's guide says it can be "Red, yellow or amber-coloured." CAA-Quebec's guide describes red lights as "Immediate danger," naming low oil, an overheating engine and brake failure among its examples, and orange or yellow lights as "Issues that need attention soon."

A flashing check engine light is not a "soon" warning, whatever colour it shows. The manuals call for immediate service when the light flashes.

For a red warning light, CAA-Quebec's guide says "Stop safely, have the car towed if needed," and you can look that light up in your vehicle's owner's manual.

What Can a Stored Code Tell a Technician?

A stored code gives a technician a starting point for working out why the check engine light came on. FCA Canada's 2026 Ram 1500 Owner's Manual says the diagnostic system stores codes and other information "to assist your service technician in making repairs."

Treat a code as the first clue in a conversation with a technician rather than as a finished answer.

For an overview of routine work such as oil changes, brake service and multi-point inspections, learn about JTC service on our Service Centre page.

What Is the Next Step After a Check Engine Light Comes On?

The next step after a check engine light comes on is to handle any safety situation, then arrange service by calling our service department or sending an online service request. A flashing light, a loss of power or anything that seems unsafe comes first; a steady light with the vehicle driving normally is a reason to arrange service soon.

Our online service request form is a way to ask for service, not emergency help.

If you have questions before sending a request, contact the service team to plan the visit.

What to Have Ready

Before you ask for service for a check engine light, note a few details:

• When the light came on, and whether it was steady or flashing

  
  

• Whether the light has stayed on through several drives

  
  

• Any change in how the vehicle drove, such as a loss of power

  
  

• On a vehicle with a fuel cap, whether the cap was tightened until it clicked

  
  

• Your owner's manual, for your vehicle's own instructions

  
  

How the Online Service Request Works

Use Request Service on our website to send a preferred date and time; that page lists check engine light diagnostics among its services.

Submitting an online service request does not confirm an appointment. Our service team contacts you afterward to confirm availability.

If a steady light starts flashing while you wait to hear back, handle the safety situation first rather than waiting on the request.

Can the Work Be Done Without Waiting at the Dealership?

Yes, within Kingston city limits: for a steady check engine light on a vehicle that is safe to drive, ask about JTC Signature Service if you do not have time to sit at the dealership. We can pick up your vehicle, leave you with a loaner, complete the service, and return your vehicle so you can keep working or enjoy your day.

You can arrange Signature Service Monday through Friday, and it works in five steps:

• We pick up your vehicle

  
  

• We leave you a loaner to use

  
  

• We bring your vehicle to the dealership for service

  
  

• We return your serviced vehicle

  
  

• We collect the loaner

  
  

Signature Service lets you stay at work and keep your day moving instead of using a day off in a service department.

While you arrange the work, view current service specials on our website.

Pick-up and drop-off is within Kingston city limits, the loaner depends on availability, Signature Service is arranged by phone in advance, and the Signature Service page lists the full terms.

Signature Service is not emergency help or a way to move a vehicle that cannot be driven safely.

Frequently Asked Questions

Is It Safe to Keep Driving With a Flashing Check Engine Light?

No: CAA-Quebec's guide to dashboard warning lights advises stopping the vehicle in a safe spot and having it towed when the check engine light flashes. FCA Canada's 2026 Ram 1500 and Jeep Grand Cherokee manuals call for immediate service, warning that "severe catalytic converter damage and power loss will soon occur."

Is a Blinking Check Engine Light Worse Than a Solid One?

Yes: FCA Canada's 2026 Ram 1500 and Jeep Grand Cherokee manuals say "Immediate service is required" when the check engine light flashes, a more urgent instruction than for a steady light. A vehicle with a solid light still needs service, since prolonged driving with it on could cause damage to the vehicle control system, according to the manuals.

Why Is the Check Engine Light On When the Vehicle Seems Fine?

A check engine light can come on while the vehicle drives normally, and FCA Canada's 2026 Ram 1500 and Jeep Grand Cherokee manuals name a loose or missing gas cap and poor quality fuel among conditions that may turn it on. If the light stays on through several drives, arrange service soon.

Is It Normal for the Check Engine Light to Come On Before the Engine Starts?

Yes: FCA Canada's 2026 Ram 1500 and Jeep Grand Cherokee manuals say the check engine light comes on when the ignition is in the ON/RUN position before the engine starts. If the light does not come on at that point, have the condition checked promptly, as the manuals advise.

Is an Online Service Request a Confirmed Appointment?

No: submitting a service request online at Jim Thompson Chrysler in Kingston asks for a preferred date and time, and our service team contacts you afterward to confirm availability. The online form is not emergency help, so handle a flashing check engine light or anything that seems unsafe as a safety situation first.

Check Engine Light in Kingston: Safety, Then the Manual, Then Service

Downtown or out on Highway 401 east of the city, a check engine light sets the same sequence in motion: make the situation safe, check your owner's manual, then arrange service.

For a steady check engine light, ask about Signature Service by phone or Request Service online.

Keep notes on what the check engine light did and how the vehicle drove, so you can pass them on when our service team contacts you to confirm a time.

Visit us at 805 Gardiners Road, Kingston, ON K7M 7E6

Request Service to ask for a preferred date and time. A request is not a confirmed appointment until our service team contacts you.

Local: (613)-389-4426 Sales: (877)-251-9249 Parts: (888)-711-5309 Service: (888)-713-0742

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About the Author:

Kerry Irven is the Vice President of New and Used Automotive Operations for Heighton Automotive Group, a family-owned and operated automotive group serving communities across Eastern Ontario. Kerry began his automotive career in new-car sales, building his experience on the showroom floor and working his way through multi-store dealership operations.

With over 25 years in the automotive industry, Kerry has helped grow automotive businesses from one location with 40 to 50 vehicles in stock to more than 500 vehicles across 10 rooftops. His hands-on background in both new and used-vehicle operations gives him a practical understanding of what customers look for when shopping for their next vehicle.

Throughout his career, Kerry has always been actively involved in staff coaching and in understanding customer wants and needs, helping ensure the businesses he works with continue to adapt to what customers are truly looking for.

One of the most exciting chapters of his career has been the shift into modern automotive marketing, embracing new technology, transparent pricing, customer-first inventory strategies, and new ways to create a better vehicle-shopping experience.

Kerry has completed extensive automotive training, including certification through the Ontario Motor Vehicle Industry Council, involvement with the Used Car Dealers Association of Ontario, Canadian automotive dealer training, and multiple customer service courses.

Born and raised on a farm, Kerry has always valued family, hard work, and a practical, down-to-earth approach. Joining Heighton Automotive Group and working alongside Thomas Heighton and family, along with managing partners Kyle Lothian and Martin Gougeon, has allowed him to bring those same values into the car business. It has also allowed Kerry to continue following a simple philosophy: treat every customer exactly the way he would want to be treated.