ECU / ECM
Repair your engine control unit instead of buying new.
When the engine control unit fails, the car stops. We test your original unit and repair it wherever that is technically possible.
Typical symptoms
- Engine won’t start or cuts out while driving
- Engine warning light, limp mode or sudden loss of power
- No communication with the diagnostic tool
- Fault codes for the control unit itself, e.g. P0606
- Faults that only appear in heat, cold or damp conditions
What causes it?
Engine control units usually sit in the engine bay, exposed to heat, vibration and moisture. Over the years solder joints crack, components age or corrosion forms on the board. Voltage spikes, for example from incorrect jump-starting, can also damage individual components.
Not every engine fault is caused by the control unit. Sensors, wiring and connectors can cause similar faults. So we first establish whether the control unit really is the cause – on site with diagnostics on the vehicle, or for parcels based on your description and testing on our bench.
Focus on Mercedes-Benz. AEZ is an independent master workshop; brand names are used for description only. We tell you whether a repair is possible after testing.
How the repair works.
- 1
Get in touch
Vehicle, VIN and what happened – via WhatsApp, phone or form.
- 2
Drop off or send in
Hand it in at Bottrop or, after a quick chat, send it by DHL. How shipping works
- 3
Test, price, repair
You get the findings and price before we repair. Then the unit goes back to you.
Frequently asked questions
Does the unit need to be re-programmed after the repair?
Because we repair your original unit, software, coding and vehicle data are usually kept. A new or used replacement normally has to be adapted to the vehicle. We tell you in advance if anything needs doing in your case.
How much does the repair cost?
That depends on the unit and the fault. After testing we tell you the price – we only repair with your approval.
Can I send the control unit in?
Yes. After a quick chat, by DHL to AEZ, Werkstraße 4, 46240 Bottrop, Germany. Packing tips and the shipping note to fill in are on the “Sending in a control unit” page.
Do you only work on Mercedes-Benz?
Our focus is Mercedes-Benz. For other makes, just ask with the vehicle and part number – we’ll tell you honestly whether we can help.