Can I still drive with my glow plug warning light on?
The short answer is that it is generally not recommended to continue driving with the glow plug warning light illuminated on your vehicle's dashboard. Glow plugs are an essential component of diesel engines, and a malfunctioning glow plug system can lead to various issues that may impact the performance and safety of your vehicle.
Understanding Glow Plugs and the Warning Light
Glow plugs are heating elements used in diesel engines to aid in starting the engine, especially in cold weather conditions. They help warm the air in the engine's cylinders, making it easier for the fuel to ignite and the engine to start. When the glow plug warning light is illuminated, it indicates that there is an issue with one or more of the glow plugs in your vehicle.
Potential Consequences of Driving with the Glow Plug Warning Light On
Driving with the glow plug warning light on can lead to several problems, including:
- Difficulty Starting the Engine: Without properly functioning glow plugs, the engine may have trouble starting, especially in cold weather. This can cause delays and inconvenience, and in some cases, may even lead to the engine not starting at all.
- Reduced Fuel Efficiency: Malfunctioning glow plugs can cause the engine to run less efficiently, leading to increased fuel consumption and higher operating costs.
- Increased Emissions: Faulty glow plugs can result in incomplete combustion, leading to increased emissions and potentially failing emissions tests.
- Engine Damage: Continued driving with a malfunctioning glow plug system can eventually lead to more serious engine problems, such as cylinder misfiring, engine knocking, or even complete engine failure.
It's important to address the issue as soon as possible to avoid these potential consequences and ensure the safe and efficient operation of your vehicle.
What to Do If the Glow Plug Warning Light Is On
If the glow plug warning light illuminates on your dashboard, the best course of action is to have your vehicle inspected by a qualified mechanic as soon as possible. They can diagnose the issue, identify the faulty glow plug(s), and recommend the appropriate repair or replacement. Depending on the severity of the problem, you may be able to continue driving for a short distance, but it's generally advisable to avoid prolonged driving until the issue is resolved.
In summary, while it may be possible to drive with the glow plug warning light on, it is not recommended. Addressing the issue promptly can help prevent further damage to your vehicle and ensure its safe and efficient operation.
How much does it cost to fix glow plugs?
The average cost for replacing glow plugs in the UK is £170.
However, prices can range from £125 to £250 depending on your vehicle's make and condition. These costs include changing all of your glow plugs in one go. The cost of glow plug replacement varies based on your vehicle and the manufacturer's recommended parts.
What to do if the glow plug light comes on?
Flashing Light: A flashing glow plug warning light indicates potential starting issues, and driving may not be possible usually sometimes faulty glow plug will cause light to flash. Seek professional assistance immediately. Could also indicate diesel particular filter issue.
Can I drive with the glow plug light on?
Is It Dangerous to Drive When My Glow Plug Warning Light is on? If the glow plug warning light is not flashing but it remains on after ignition, you should wait until it turns off before driving. The 15-second rule is valid but wait for a few minutes if you must.
How long can I drive with a faulty glow plug?
Is it safe to operate a vehicle with a faulty glow plug? No, it is not safe to drive with a faulty glow plug. An improper combustion chamber temperature will lead to inadequate fuel ignition, resulting in the misfiring or rough running of your engine.
How long should a glow plug light stay on?
Don't ignore the warning light
If the warning light is staying on for longer than 10 to 15 seconds, before the engine is started, it's likely that the glow plug is losing its power efficiency and it will need to be replaced.
What happens if you don't replace bad glow plugs?
If your glow plug isn't doing its job, the fuel will not be hot enough, and fuel injection will fail. As a result, your engine will misfire.
How long should the glow plug light stay on for?
Don't ignore the warning light
If the warning light is staying on for longer than 10 to 15 seconds, before the engine is started, it's likely that the glow plug is losing its power efficiency and it will need to be replaced.
Can faulty glow plugs damage an engine?
Glow plugs contribute additional heat in the combustion chamber to aid this process. If faulty glow plugs fail to reach the necessary temperatures, the engine's performance will suffer, requiring it to work harder to cope with road demands, which in turn reduces fuel efficiency.
Is a glow plug warning light serious?
By driving with a glow plug warning light, you run the risk of developing serious engine problems. The engine may struggle to start again, or even shut off whilst you're driving – which could be extremely dangerous.
Is it bad to run with a bad glow plug?
Driving on a faulty glow plug will result in continued poor performance. Eventually, your engine will misfire. Misfiring in turn lowers your fuel efficiency. You'll find yourself needing more fuel for fewer miles on your engine.
