Glow Plug Warning Light Issue: Causes And How To Fix It?

Are you experiencing trouble fixing the glow plug warning light symbol illuminating the dashboard of Audi A1, A3, A6, or other diesel-powered vehicles?

Several factors cause the flashing glow plug light to remain on even if the car has started running. I will assist you in fixing this plug warning light. In this article, We’ll explore common possible causes and solutions to address these causes, which will help you solve such problems in the future.

What is a flashing glow plug light?

You must understand the difference between a normal glow plug light and an error indicating a glow plug light usually revealed on the dashboard with a yellow coil blinking symbol. If you own an Audi or any diesel-based vehicle, you have seen this symbol on the dashboard while starting the car early in the morning. 

The glow plug provides essential heat to the engine in cold weather and maintains its temperature according to the atmosphere. It helps the engine to become warm and run smoothly. The glow plug system automatically disappears from the dashboard when the engine is warmed enough.

What is a glow plug warning light?

When you see the symbol is still flashing and not disappearing from the dashboard, then it means that the plug becomes faulty or needs quick replacement. The purpose of the warning light is to inform the Audi’s owner about the issues that need attention to be resolved.

How do you fix the glow plug warning light?

To fix the glow plug warning issue, look closely at the expected possible causes and pinpoint the exact component after inspection. When you find the faulty part, do what needs repair or change. 

This video will help you address problems and bring the glow plug warning error to normal condition.

Causes of Flashing Glow Plug Warning Light

The warning message of the glow plug points to several underlying faults or damages, causing the symbol to blink on continuously. The breakdown of the most common causes is below.

• Faulty glow plugs
• Cold weather
• Control module failure
• Electrical problems
• Sensors faults
• Engine management system issues

Faulty glow plugs

The first thing you need to do is check the condition of glow plugs to see whether they are faulty. Glow plugs are vital in maintaining engine temperature, especially when the weather is cold.

Over many years of usage, the glow plugs can lose their potential to deliver heat to the engine and start showing signs of wear that lead to glow plug warning errors.

Cold Weather

In cold weather, glow plugs must deliver more heat to the engine to increase the engine’s ability to start and work properly. Due to cold weather, the glow plugs took a long time to fulfill the engine’s essentials, and its symbol took longer to disappear.

Glow Plug Control Module Failure

The control module manages the operations of the glow plug, like when turning the light on and off. A malfunctioning or failing control model cannot correctly control the glow plug function and measure the engine heat.

Wiring or connector issues

Damaged wiring and loose connectors can affect the glow plug’s efficiency. Since current passes through wires and minor damage in wires can disrupt current flow to other parts of the vehicle, it will trigger the glow plug light issue.

Sensor Malfunctions

Various sensors related to the engine functions, like temperature sensors, measure the engine’s temperature and then signal the control module to turn the glow plugs light on or off.

A faulty sensor will send incorrect signals to the plug control module, resulting in engine overheating or low heating and blinking the glow plug light for an unusual period.

Engine Management System Issues

Sometimes, problems in the engine control unit (ECU) or software issues can also cause the blinking of a warning light.

Solutions for flashing glow plug warning

All solutions are described below, along with the prevention tips.

1. Faulty Glow plugs replacement
2. Control module inspection
3. Wiring checking
4. Malfunctioning Sensor inspection
5. Regular service

Replace glow plugs

After inspecting the condition of glow plugs, if you’re feeling any signs of wear or experiencing damage, replace the plugs with a new high-quality one. If the warning light is flashing longer than 15-20 seconds, it indicates a power loss that might lead to other engine faults.

Glow plug control module replacement

If the control module is not working or controlling the plug functions correctly, then replace it with a new one. You might need special tools to diagnose whether the control module is faulty. With the help of the diagnostic tool, you can quickly know about all the technical and mechanical issues in your Audi vehicle. 

wiring/connectors inspection

Inspect the wires and connectors; if any broken wire or fault is found, repair or change it to ensure a proper electrical flow through various engine components.

Sensor Replacement

Inspect sensor faults with the help of diagnosis tools like OBD-II to scan code errors and software glitches. Pinpoint the faulty sensor and then replace it to restore the correct signals sent to the control module and prevent the glow plug warning message.

Regular Maintenance

To avoid dealing with glow plug warning issues, it’s crucial to care about glow plugs health and longevity. Regular maintenance helps remove minor problems promptly and helps analyze which parts need attention and require a quick replacement.

In conclusion, the glow plug light is only dangerous for engine health when it continuously flashes for a long time and indicates a problem with the glow plug system. Don’t ignore this warning because it can cause a loss of power, and you will not be able to drive more smoothly.

So, after watching the warning light, inspect all the components and look for eros. Fix it yourself if you have enough knowledge of the engine system or get service from an expert mechanic. Regular service appointment completion and timely repairs are essential to preventing your Audi vehicle from such issues.

FAQ – Frequently Asked Questions

Can I drive my car with the glow plug warning light on?

Driving with the glow plug warning is not advisable, even if you can. It can lead to more severe issues, and immediately inspect your vehicle from the nearest mechanic to resolve underlying problems.

What causes the glow plug light?

Potential causes include faulty glow plugs, cold weather, injection system faults, electrical issues, sensor malfunctions, and control module failure cause, triggering the warning symbol to remain on.

Are glow plugs expensive to replace?

No, glow plugs are not too expensive and are readily available in mechanic shops. However, its price can vary depending on the car model and the country where you live.

How can I prevent plug light issues?

Regular maintenance, addressing issues promptly, high-quality parts usage, and professional mechanic assistance will prevent glow plug-related issues in your Audi car.