ECU Repair and Testing

ECU Repair

Repairs are done at component level. We replace the individual chip, driver, capacitor or track that's failed, under a microscope, instead of swapping the whole unit and hoping. Your original ECU comes back to you with your original data still on it, so there's nothing to recode at the car

ECU Cloning

Cloning copies the data off your original unit and writes it to a donor. It's the route we take when a board is too far gone to save, usually after a fire or long-term water damage. Because the donor ends up carrying your original data, cloning normally avoids the need for immobiliser reprogramming

ECU Programming and Coding

This is the software side: writing a virgin unit to your vehicle, matching a replacement to the immobiliser, updating calibration files, or coding a module so the rest of the car recognises it. A fair number of jobs that look like hardware failures turn out to be a unit nobody coded properly in the first place.

Bench and Boot Mode Programming

Some units won't talk through the OBD port at all, either because the fault has killed communication or because the manufacturer locked them down. We read and write those directly on the bench, or in boot mode, with the board running off our own supply. Slower, and often the only way in

ECU Diagnostics

Every unit gets tested before anything is repaired. We run it on a bench rig that simulates the car, so we can watch the fault happen rather than guess at it from a code list. You're told what's actually wrong with your unit, whether or not you go ahead with the work.

ECU Faults and Symptoms We Repair

Here's what people describe when they get in touch for common ECU fault symptoms:

• Engine turns over but won't fire
• Dead dash and no communication with a diagnostic tool
• Cutting out while you're driving, then starting again fine
• The same fault code coming back after every repair
• Corrosion, green residue or a damp smell inside the casing
• Limp mode that clears on a restart and returns within minutes
• An immobiliser refusing a key that worked yesterday
• A burnt smell or a scorch mark on the board
• A battery flat within days, over and over, with no obvious drain

One thing worth checking before you go further. Plenty of faults that get blamed on the engine ECU actually sit with the body control module: central locking playing up, lights doing their own thing, windows and wipers behaving oddly. If that sounds closer to your car, the BCM fault symptoms list will sort it out quickly.

 If the module turns out to be the body control unit rather than the engine ECU, BCM repair and cloning works the same way.

Nationwide ECU Repair across the UK

Your postcode doesn't change the job. The unit comes off the car, travels to the bench in Leigh, and goes back the same way, so a driver in Inverness gets the same process as one in Wigan. Units already reach us from well outside the North West, South Wales and Blackpool among them.

• London and the South East: London, Reading, Brighton, Southampton, Oxford, Milton Keynes and Guildford, plus Kent, Surrey, Essex and Hertfordshire
• South West: Bristol, Plymouth, Exeter, Bournemouth, Swindon and Gloucester, plus Devon, Dorset, Somerset and Cornwall
• Midlands: Birmingham, Coventry, Leicester, Nottingham
• North West: Manchester, Liverpool, Preston, Bolton, Wigan, Blackpool, Chester, Cheshire and Lancashire
• Yorkshire and the North East: Leeds, Sheffield, Bradford, York, Hull, Newcastle, Sunderland and Middlesbrough
• Scotland: Glasgow, Edinburgh, Aberdeen
• Wales: Cardiff, Swansea, Newport and Wrexham
• Northern Ireland: Belfast, Londonderry, Lisburn and Newry

One thing worth saying plainly: distance isn't the deciding factor, the job is. Some faults have to be worked on in the vehicle rather than on the bench, and that's true whether you're in Croydon or Carlisle. Send your registration and a couple of photos over first and we'll tell you which one yours is.

Need ECU Repair locally? We cover ECU repair in Manchester and ECU repair in London.