Book an ECU Repair for your Mercedes| RAC

Why choose the RAC for an ECU repair?

At the RAC, we've got over 125 years' experience helping UK drivers. We have the skills and knowledge to keep your vehicle running. We'll give you results you can rely on at a price you can afford.

ECU Repairs for Mercedes vehicles requires specialist tools and workshop facilities, so this work is completed through the RAC Approved Garage Network. Our approved garages service models such as A-Class, C-Class, GLC, E-Class, and EQA, following manufacturer procedures, certified equipment standards and rigorous quality checks. You receive transparent pricing, progress updates and RAC‑backed guarantees.

Close up of an RAC Mobile Mechanic underneath a car

Book an ECU repair

The Engine Control Unit (ECU) is the brain of your vehicle and works to keep it running smoothly. If it's acting up, it can mean poor performance, increased fuel consumption, or trouble starting your car.

Quality work

Any work done will meet the high standards set by the RAC.

Exceptional customer service

We’re friendly, straightforward and jargon-free

A mechanic inspecting the underside of a vehicle.

Book a diagnostic

A mechanic will check your car for faults and talk you through any repairs you might need. There are various ways to check for faults, which could include a physical examination or plugging in to check your car’s onboard engine management system.

Diagnostic check

We’ll look for any mechanical or electrical problems. If we need to, we’ll also check your car’s onboard engine management system. Depending on your car and issue, this will usually include: – Engine – Power steering – Brakes – Transmission – Exhaust system – Fuel injection system – Cooling system and air flow – Sensors

And it’s not just ECU repairs that we do for Mercedes

RAC Approved Garages offer MOTs and services. Our professional mechanics have the expertise and experience to make sure your vehicle is operating safely and efficiently – results you can rely on at a price you can afford.

A close up of an RAC mobile mechanic looking under the hood of a car

Try one of our RAC Approved Garages

View all garages

J Day Engineering

4.6/5

Your vehicle is in safe hands with our highly skilled, dedicated team. From booking to key handover, we provide expert advice, clear communication and exceptional care throughout. J Day Engineering is accredited by leading industry bodies and is a multiple award-winning Motor Trader Independent Garage of the Year, giving you complete confidence in our workmanship and customer care. Our advanced facilities include two Hunter HawkEye Elite alignment systems for cars and commercial vehicles, Hunter Quick Check Drive and Quick Tread Edge, advanced ADAS calibration, specialist EV and hybrid servicing, and comprehensive dealer-level diagnostics. Exceptional people, technology and facilities — with the personal care and accountability of an independent specialist.

J Day Engineering, Bow Bridge, The Marsh, Henstridge, BA8 0TF

Sparrowhawk Motors IV LTD

4.4/5

From a convenient location in West London Sparrowhawk motors Garage has been offering a full range of garage services for over 20 years to customers from all over London. Whatever work your car needs, the team of qualified mechanics will carry out great work for a reasonable cost. In addition, we can assure your expectations will be exceeded whatever your requirements may be. If you are looking for car repairs or service in the London area, then Sparrowhawk motors can meet your needs at a competitive price. The convenient location makes it ideal for the Londoners to find us.

Arch 15, Munster Road, Chelsea, SW64RY

Pak Motors Glasgow Ltd.

4.1/5

Pak Motors Glasgow Ltd , Scotland - South West PAK Motors has been operating since 2014. We are a local business for the local people and we care. The garage offers a 5 ramp workshop with 4 service ramps and 1 dedicated MOT ramp for class 4,5 & 7 testing. We are equipped with latest technology, excellent infrastructural facilities and a team of professional mechanics to solve every automobile-related need. Our high standard premium garage features quality services and state-of-the-art machinery and equipment to give you the service you deserve. We are able to work on all makes/models and repairs. In short, we are a one stop shop for all your motoring needs from a simple oil change or MOT to a major head gasket replacement we have you covered! We also are pleased to announce we offer a free collection/delivery service locally for our customers convenience Note: If you don't want to pay all of your bill in one go, no problem as we do offer Payment assist.

105-109 Whitefield Road, Glasgow, G512SD

Apollo Servicing & Repairs Ltd

5.0/5

From diagnostics to repairs, we ensure your vehicle runs smoothly. We offer a wide range of services on all major makes & model of vehicle. As an independent business based in Wroxton, Banbury, we pride ourselves on providing customers an exceptional service at a affordable price without cutting corners. Services such as MOTs, Diagnostic, Tyres, Breaks, Clutches, Timing Belts, Air Conditioning, Exhausts, Servicing and Repairs. We have Courtesy Cars available, offer a Collection and Delivery Service, Health Checks and Recovery Services locally all free of charge. We have invested heavily into the best tools and equipment and have brand new facilities with a Waiting Area, Wifi, Parking, Drinks and Snacks. We look forward to welcoming you soon

Unit 8 Apollo Park Ironstone Ln, Banbury, OX156AY

Auto Care Centre

4.7/5

We are an established local independent garage and are proud to be members of Autofirst Network – a nationwide network of independent garages operating to the Network’s 6 core values of Capability, Consistency, Care, Clarity, Cost Effectiveness and Customer Focus. For your added peace of mind we are members of the Motor Ombudsman service which is approved by The Trading Standards Institute.In short, we are a local garage you can trust offering you the support and service guarantees of a national network, giving you complete peace of mind. We cover the postcode areas and also offer courtesy cars and a free collection and delivery service.

88 Maidenhead Road, Windsor, SL45EL

Frequently asked questions about ECU repairs

Can my damaged ECU be repaired?

Yes, a damaged ECU can often be repaired. Whether it can be depends on the amount of damage and how easy it is to find replacement parts.

Can I fix the ECU myself?

It's usually best to leave ECU repairs to the experts. This is because as they require special tools and knowledge of car electronics.

What are the signs of a failing ECU?

Look out for a check engine light being on, the engine stalling or misfiring, poor fuel economy and difficulty starting the car.

How long will my ECU repair take?

It can take anywhere from a few hours to a couple of days. This depends on the issue and how available the parts are.

Is my ECU repair covered by car insurance?

ECU repairs may be covered if the damage is caused by something that is insurable, like an accident. Talk to your insurance provider to find out more.