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Audi Start Stop System Fault [Meaning, Causes & Fix]

If you own an Audi, you may have encountered the “Start stop system fault” appearing on the dashboard. This can be concerning if you’re not sure what is causing it.

In this article, I will discuss the reasons behind this issue and provide solutions to resolve it. Let’s begin.

What is Audi Start Stop System?

Before we dive deep into what is causing the “start-stop system fault” message on your Audi dashboard, let’s first talk about what the start-stop system is.

The Audi start-stop system is a technology that was developed to improve fuel economy and reduce exhaust emissions in your car.

In essence, this technology turns off your car engine while you are idle at traffic lights or stop signs, conserving fuel.

Once you resume movement, an electric motor and clutch assembly automatically restart the engine.

There are a few conditions that need to be met in order for your Audi start-stop system to function properly. These include:

  1. Your Seatbelt Must be Fastened
  2. All Doors Need to be Closed
  3. The steering wheel needs to be straight (Not Turned)
  4. Transmission must be in Neutral, Park or Drive
  5. The battery must have at least 70% of its charge
  6. Engine Temperature must be optimal operating temp

What Does “Start Stop System Fault” Mean on an Audi?

Now that you know what the system is and how it works let’s look at what the start stop system fault light means on an Audi.

To put it plainly, the message indicates that there is an issue with your car’s start stop system, resulting in a malfunction of your Audi’s start-stop system.

Fortunately, as an Auto technician, I can tell you this fault is usually caused by one thing (I will cover that below) and is relatively easy to fix.

What Causes Audi’s “Start Stop System Fault” Message?

Technically there are a few reasons why the start stop system fault message may appear on your Audi.

However, after working on Audis over the years, I have found that the most common cause of the start stop system fault message is due to a battery that is not holding a charge or is not fully charged.

In other words, a bad battery is the main culprit when it comes to this.

The Battery on your vehicle is responsible for the car’s electrical system.

When your battery is fully charged, and in good condition, it will allow the car to start easily and operate normally.

If the battery begins to lose its charge over time (which happens), then you may experience problems with your Audi’s start-stop system and other electrical systems.

Typically the battery on Audi’s lasts 3-5 years, and if yours is older than this, then it may be time to replace your battery.

It is important to note that the leading cause is the same in all models; whether you have an Audi A1, A3, A4, A5, A6, A7, Q3, or Q5 a bad battery is the leading cause.

How to Fix and Reset Start Stop System Fault Warning on an Audi

Now that you know what is causing the start-stop system fault warning on your Audi, let’s talk about how to fix it.

Step 1: Disconnect and Reconnect the Battery

The first thing that you should do is disconnect and reconnect the battery. This will reset your Audi computer system and may fix the problem.

Make sure that you disconnect the negative terminal first and then reconnect it last when reconnecting the battery. If the message goes away then great, you’re good to go. If not, then move on to step 2.

Step 2: Get Your Battery Tested & Replaced

If you’ve tried disconnecting and reconnecting the battery and the message is still there, then you need to get your battery tested.

If it’s bad, then you will need to replace it in order to fix the start-stop system fault. As I mentioned your car battery does deteriorate over time and this can be the source of your problem.

The best thing to do is get it tested at an auto parts store, Audi Dealership, or a garage that has the ability to test batteries.

If they say it’s bad, then you will need to replace it with a new one.

Note: On Some Audi models, the new battery may need to be programmed into the car’s computer.

This is usually done by a dealer or mechanic, but if you’ve done it before, then it shouldn’t be too difficult to do on your own.

99% of the time replacing the battery will fix and reset the problem. If you would like to know more about this, feel free to comment or send me a message.

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5 thoughts on “Audi Start Stop System Fault [Meaning, Causes & Fix]”

  1. Hi, I have the same fault showing, but I also have the Stability control (ESC) fault, along side a steering wheel warning light. When I drive the car steering now feels very heavy.
    Could this all be caused by the battery? Car is an A1 2013 90,000 miles.
    I’m going to get the battery tested tomorrow so see if it’s good or bad re charge.

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