Renault Clio 1.5 dCi ECU – Common problem

This engine ECU (DCM1.2) is a very common failure for Renault vehicles fitted with the 1.5 dCi engine built between 2002 & 2015. The common symptom is complete non starting with no communications via diagnostic. You may also have the immobiliser light on all the time and the coolant fan constantly running, the main relay will also not function when the ECU is faulty.


This ECU is very expensive when purchased directly from the manufacturer or main dealer, we are able to rebuild your own unit for a fraction of the dealer cost and we give an unlimited mileage lifetime warranty with every rebuild.

Renault Clio Engine ECU

Test and rebuild process:

First we test your ECU on our purpose built HIL (Hardware In the Loop) test rig, this allows us to run your ECU exactly as if it was running on the vehicle under all driving conditions. Once we have identified that your ECU is faulty, we then go on to the rebuild stage – during this stage we replace all the common failing components with higher rated versions and correct the original design flaw, this is how we are able to give such a long warranty period. Once your ECU has been rebuilt we then test it again on the HIL rig to ensure it is functioning as new. We then ship it back to you, ready to be fitted back on to the vehicle.


Common failing part numbers:







This ECU is also fitted to the following vehicles:

Clio 1.5dCi

Megane 1.5 dCi

Modus 1.5 dCi

Kangoo 1.5 dCi


Turnaround time:

Our current turnaround time to rebuild your own unit is approx. 3 - 5 working days.

Delivery time for a replacement unit from stock is currently 1 - 2 working days (when available).



Lifetime unlimited mileage*


Prices and options:

For full price/shipping information please choose your vehicle from the list above.


If you would like to have your own unit fully rebuilt, then you have two options regarding payment:


Pay in advance:

This option will allow you to pay for the rebuild in advance of the unit arriving with us, this is the faster option as we will not need to contact you once your unit has been tested, we will just go ahead with the rebuild if it is faulty and then send it straight back to you. To pay in advance for this service please select your vehicle from the list above.


Pay after testing:

With this option we will contact you for payment after we have received and fully tested your unit, then you can decide if you want us to go ahead with the rebuild or not, it is at this point you would need to pay. This option is a little slower but gives you greater control over whether you want the unit rebuilding or not once it has been tested. If you prefer this option, then please fill in this test form and we will immediately email you with full shipping instructions.


If you require further information regarding this ECU, then please contact us.

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