Engine ECU Repair
Engine control units (ECU, ECM, DME) for petrol and diesel cars and vans – fault diagnosis on the bench, repair, cloning to a replacement unit and tested used ECUs ready to fit. Postal service across the UK from our lab in Rainworth, Nottinghamshire. Every unit is checked on the bench before we quote, and no work starts without your approval.
Choose what you need
| Service | When it fits | Price | |
|---|---|---|---|
| Bench test and written quote | You are not sure the ECU is the fault | £45, deducted from the repair | Order a test → |
| Engine ECU repair | Your original unit has a confirmed internal fault | from £230 | Book a repair → |
| ECU cloning and data transfer | You have a replacement ECU and need it to work with your keys and immobiliser | £150 | Book cloning → |
| Tested used ECU, cloned to your car | Your unit cannot be repaired or you need a spare quickly | per unit | Buy a tested ECU → |
| Trade prices for garages | You send us modules regularly | 10–20% off | Join the programme → |
Symptoms that point to the engine ECU
| No communication | Scan tool cannot reach the engine ECU, while other modules answer |
| No start | Engine cranks but does not start, or no crank signal; immobiliser does not release |
| Warning light with internal codes | Engine light on with control module memory, processor or performance codes |
| Intermittent faults | Cut-out, misfire or limp mode that stays after sensors, wiring and fuses have been checked |
| After jump start or welding | Faults that started straight after a voltage spike or a jump start with reversed leads |
| Water damage | ECU mounted low or near the scuttle panel, with signs of water in the connector or housing |
Fault codes that point to the ECU itself
These are generic OBD-II codes used by all makes. They suggest an internal ECU fault rather than a sensor or wiring problem. Manufacturer-specific codes differ – send us the full readout with your part number.
| P0601 | Internal control module memory checksum error |
| P0602 | Control module programming error |
| P0603 | Internal control module keep-alive memory (KAM) error |
| P0604 | Internal control module RAM error |
| P0605 | Internal control module ROM error |
| P0606 | Control module processor fault |
| P0607 | Control module performance |
| U0100 | Lost communication with ECM/PCM (logged in other modules) |
Engine ECU families we see most often
| Manufacturer | Typical families | Common in |
|---|---|---|
| Bosch | ME7, MED9, MED17, MEVD17, EDC15, EDC16, EDC17, MD1 | VW, Audi, Skoda, SEAT, BMW, Mercedes, Ford, Vauxhall, Fiat, Peugeot, Citroen |
| Continental / Siemens | SID, Simos, PCR, EMS | Ford, Peugeot, Citroen, Renault, VW group, Volvo |
| Delphi | DCM, DDCR, MT | Ford, Renault, Nissan, Hyundai, Kia, Vauxhall |
| Denso | Denso petrol and diesel ECUs | Toyota, Lexus, Mazda, Honda, Subaru, Land Rover |
| Marelli | IAW, MJD | Fiat, Alfa Romeo, Vauxhall, Suzuki |
Not on the list? Send the part number and hardware number from the label – we confirm before you post anything.
Cloning: your keys keep working
A replacement engine ECU normally will not start the car, because it carries the immobiliser data of the car it came from. Cloning copies the identity and data of your original unit to the replacement, so the car starts with your existing keys and no coding at a dealer is needed. Send both units together – your original and the replacement – and we return the cloned unit with a report.
Before you send the ECU
- Note the part number, hardware number and software number from the label – a photo of the label is enough.
- Save the full fault code readout, if you can read it.
- Start a repair request with your registration and the fault.
- Pack the unit as shown in our packing instructions and post it tracked.
How it works
Bench test and written quote: £45 per module. The fee is deducted from the repair if you approve it. If you decline, no fault is found or the unit cannot be repaired, you pay only the test fee and we return the unit with the report – tracked UK return included. See how it works.
Local service near Mansfield – lab work by post
Mobile appointments in Mansfield, Nottingham and Nottinghamshire by arrangement. Supported electronic modules can be posted after booking. Parts drop-off by prior arrangement. Contact us before visiting.
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Request a quote
Tell us about the vehicle and the problem. We confirm compatibility and the price before any work is booked.
- Reply from a technician, not a call centre
- No obligation – quote first
- UK-wide by post, local work in Mansfield & Nottingham
Prefer not to post it yourself? Ask us and we quote a collection from your home or workshop for your postcode.
Popular repairs
Module repairs we carry out by post, with bench testing and a written report.
