// What fails
Engine ECUs fail for boring, physical reasons: cracked solder joints from years of heat cycling, corroded tracks after water ingress, blown driver transistors when an injector or coil shorts, and damaged power stages after jump-start mistakes or alternator overvoltage. The software is rarely the problem — the board underneath it is.
Because the ECU holds your immobiliser data, a second-hand replacement usually will not just plug in and start. Repairing or cloning your original unit keeps the coding, the keys and the adaptations exactly as the car expects — which is why we always try to save your own ECU first.
Symptoms we see every week
- Engine cranks but will not start, with no communication on the diagnostic port
- Misfires or injector/coil fault codes that persist after new parts
- Intermittent cutting out, stalling or limp-home mode
- Check engine light with internal ECU fault codes stored
- No-start after a jump start, battery change or water ingress
Our process
- DiagnoseThe fault is confirmed with proper diagnostics and board inspection before any work is quoted.
- RepairComponent-level repair on your original unit — coding, keys and adaptations preserved.
- Bench testThe repaired unit is proven on the bench under realistic conditions before it goes back.
- WarrantyWork is covered by our workshop warranty, with terms confirmed in writing on your quote.
Every repaired engine ECU goes back on the bench rig before it leaves us: power-up, communication, and output-stage checks under load. If your unit is beyond economic repair we will tell you straight, and can usually clone your data onto a donor unit instead.
Pricing
Engine ECU repair starts from £150, with a typical job around £190 depending on the unit and fault. Cloning and reprogramming are quoted per job — send us the part number for an exact price before you commit.
Frequently asked questions
Will a repaired ECU need coding to my car?
No. We repair or clone your original unit, so the immobiliser data, VIN and adaptations stay intact. The car simply gets its own brain back — refit it and drive.
How do I get my ECU to you?
Either bring the car to the Basingstoke workshop, post the unit to us, or book a mobile visit across London and the South East. Call or WhatsApp 07404 487674 first and we will confirm the best route for your fault.
What if the ECU cannot be repaired?
If the damage is beyond economic repair, we can usually clone your data onto a matching donor unit so the car still starts with your existing keys. You only pay for work we can actually deliver — diagnosis is honest, not optimistic.
How much does engine ECU repair cost?
From £150, with a typical repair around £190. The exact price depends on the unit and the fault, so send the part number and symptoms for a firm quote before any work starts.