The Engine Clean standard: prove whether the fault is inside the unit, then choose the most sensible technical route.
Symptoms are a starting point—not a verdict
A non-start, intermittent cutting out, missing sensor signals, repeated fault codes or no communication may justify ECU investigation. None of those symptoms proves the control unit is responsible on its own. Recent work, water ingress and the vehicle's repair history can be just as important as the codes.
What should be checked before an ECU is condemned?
Vehicle-side powers, grounds, fuses, relays, wiring and network communication should be tested where the vehicle is available. A controlled bench test can then help establish whether a removed ECU powers up, communicates and behaves as expected. The correct route depends on the ECU and the fault.
What to send with a first enquiry
Make, model and year plus the registration, VIN or a clear ECU-label photograph is enough to start the conversation. The ideal evidence is a clear label image, both sides of the case and a straight-on photograph of the connector pins, but do not delay an enquiry if you cannot provide every image.
The outcome may not be a repair
Testing may support an in-house electronic repair, a compatible donor unit, cloning, programming or coding. It may also show that the fault remains on the vehicle and the ECU should not be replaced. The recommendation follows the evidence rather than the most expensive part.
Straight answers
Before ECU or module work
Does a fault code prove my ECU is faulty?
No. A fault code records what a control unit detected. Powers, grounds, wiring, network communication and related components may need testing before the ECU is blamed.
Can Engine Clean diagnose the complete vehicle?
Yes. Suitable initial vehicle inspections and diagnostics are available, followed by workshop or bench work when deeper testing is needed.
What details do you need to identify an ECU?
Make, model and year with the registration, VIN or a clear photograph of the ECU label is enough to begin. More photographs may be requested after identification.