Electric and Hybrid Vehicles

Battery not charging? Car refusing to start or showing a warning? With electric and hybrid vehicles, a fault doesn't always mean replacing an expensive component. Sometimes the answer lies in the electronics and software.

Do you really need to replace the entire high-voltage battery?

Imagine driving your hybrid Audi when the battery stops charging. You go to the dealer and hear: "You need a new battery." And that means a bill running into tens of thousands. But does the battery itself really need replacing? We had a case like this at Das Auto Service and found another solution – we reflashed the modules controlling the individual cells. No battery replacement needed.

Open high-voltage hybrid battery at a VAG electric and hybrid vehicle workshop

And that wasn't the only case. A new Porsche Cayenne Turbo E-Hybrid, with just 3,000 km on the clock, suffered a minor impact. Once again, the dealer recommended a new battery. We had a solution for this problem too. New platforms have their own particular challenges, and sometimes the answer isn't replacing the whole component but working correctly with the control electronics.

Why does the DQ400 hybrid gearbox need special attention?

The DQ400 gearbox is used in hybrid Audi, Volkswagen, Seat and Škoda models. It needs more maintenance than any other DSG. That's because the electric motor creates sharp temperature changes that put extra stress on the components. It's not a gearbox you want to neglect.

VW Golf GTE hybrid engine bay with orange high-voltage cables

You may have heard, even from garages and YouTube "experts", that the DQ400 filter can't be replaced while the engine and gearbox are still fitted in the car. That's simply not true. We replace it without removing either of them. And it matters – leave the filter too long and it can break down, clogging the system.

Why won't your Porsche start even after charging the battery?

There's a particular problem affecting the Porsche 911, Cayenne from 2018 onwards, Taycan, Lamborghini Urus, Audi e-tron GT and Bentley Bentayga. The 12V lithium-ion battery can fail prematurely. You charge it, but the car still won't start. Or the battery won't accept a charge at all. It may have entered protection mode after a serious accident, a major voltage drop or a long period without use.

Porsche instrument cluster displaying a Battery low warning

You can't simply fit a standard battery here. The original communicates with the Gateway control module over the LIN bus. Replace it incorrectly and the charging system won't work as it should. A few months later, the warning may come back. Which means the underlying problem hasn't been properly resolved.

Open 12-volt lithium-ion battery with its electronic circuit board exposed

At Das Auto Service, we use a genuine kit to stabilise the battery packs. We then carry out a software update, programming and adaptation to the newer control system. This restores the battery's operation. You'll find plenty of places offering battery "reconditioning", but without the necessary software update and adaptation, the warning light can return.

What else can we do for your electric car?

We also work on electric vehicles from the Volkswagen ID range and Audi Q4. If you have an ID.4 in Chinese specification, for example, we can convert it to the European version. This involves the vehicle's configuration and software, not just changing the language on the screen.

We also carry out retrofits on the Audi Q4 e-tron. It's another part of our work with newer electric platforms, where electronics and correct programming make a real difference. We use genuine parts, and if you're a private customer, they come with a two-year warranty. The important thing is understanding exactly what's wrong before deciding what needs replacing.

Advice from Kris Mladenov: If your battery isn't charging, don't assume you need a new one straight away. First, check whether the problem lies with the control modules or software.