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

KMK Automotive - Walton On The Hill

5.0/5

KMK Automotive is an independent family-run business based in Surrey, backed by more than 30 years’ experience in the industry. With auto repair garages in Leatherhead and Tadworth, we deliver exceptional vehicle repairs and services for all makes and models and our qualified mechanics complete jobs of all sizes to the highest possible standard. Whether you need to repair a fault, or your MOT test is due, our AA & RAC-approved auto centre has got you covered. For a high-quality, cost-effective alternative to main dealer services, get in touch with our fully insured team today.

Rear Of 14 - 16, Walton On The Hill, Tadworth, KT207RT

GT Automotive Group ~ Sheffield

4.5/5

GT Automotive offers a comprehensive range of Aftersales services and vehicle repairs from our fully equipped onsite workshop. Our highly skilled and qualified technicians bring years of experience across multiple vehicle brands. Every vehicle that comes to us receives a FREE health check, including a full digital report for your peace of mind and safety. To make maintenance more manageable, we also provide 0% finance options over 3 or 6 months. Customers can relax in our comfortable waiting area with refreshments, or take advantage of our collection and delivery service available for local customers. As a proud family-run business, we’re committed to serving our local community with honesty, care, and exceptional service.

1 Orgreave Way, Sheffield, S139LS

A1 Motorist Centre

4.9/5

A1 Motorist Centre was first established in 2005 moving to our present site in late 2006. Our aim is to offer the latest technology that the motor industry can offer, combined with good old fashioned values and excellent customer care. We offer you a clean comfortable reception / waiting area with complimentary refreshments, free Wi-Fi internet connection and toilet facilities (this also includes disabled access). From here you will have a full view of the workshops so that you can watch as we work. We offer many services and our advice is free and impartial. We are members of the Good Garage Scheme and the Motor Industry Codes of Practice.

Unit 2, Patricia Way, Industrial Estate, Broadstairs, CT10 2LE

Mobile Mechanics and Tyres

4.9/5

Services provided: -- Can build and assemble machines or mechanical components according to requirements -- Able to Inspect machines, engines, transmissions etc. and run diagnostic tests to discover functionality issues -- Will aim to troubleshoot reported problems and resolve them in a timely manner -- Will perform thorough maintenance on machinery, equipment and systems -- Will clean and apply lubricants to components -- Will replenish engine fluids and components -- Will provide consultation on correct maintenance and preventative measures -- Can also undertake other duties (e.g. repair of hydraulic systems) -- Can provide logs of work and report on issues Experience: Proven experience as Mechanic for 12 years. Excellent knowledge of machinery and hydraulic, electrical and other systems and their components. Experienced in using various precision tools (I have equipment to perform most mechanical work). Will follow established procedures and practices with a strong commitment to health and safety. Very good communication skills with problem-solving capabilities. Very good physical strength and stamina Qualifications: BTEC national diploma motor vehicles (2 year course) HNC motor vehicles (1 year course) HND motor vehicles (1 year course) IMI (Institute of the Motor Industry) MOT Certification NT / AE / Site Manager Classes of Vehicles tested: Class Descriptionwheeled vehicles (over 450kg unladen weight) 4 Cars (up to 8 passenger seats) 4 Motor caravans 4 Quads (max unladen weight 400kg - for goods vehicles 550kg and max net power of 15kw) 4 Dual purpose vehicles 4 Private hire and public service vehicles (up to 8 seats) 4 Ambulances and taxis 4 Private passenger vehicles and ambulances (9 to 12 passenger seats) 4 Goods vehicles (up to 3,000kg design gross weight) 4a Class 4 vehicles (9 to 12 passenger seats) with a seat belt installation checkPrivate passenger vehicles and ambulances (13 to 16 passenger seats) 5 Private passenger vehicles and ambulances (more than 16 passenger seats) 5 Playbuses 5a Class 5 vehicles (13 to 16 passenger seats) with a seatbelt installation check 5a Class 5 vehicles (more than 16 passenger seats) with a seatbelt installation check 7 Goods vehicles (over 3,000kg up to 3,500kg design gross weight

Unit 4, Red Rose Trading Estate, Lancaster Road, Barnet, EN48BZ

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

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.