Vauxhall Adam and Corsa E engine ECU failure - causing non-start

Vauxhall Corsa E engine ECU fault

This Vauxhall Adam and Corsa E engine ECU is a common failure that prevents the engine starting or cranking over. These AC Delco E78 engine ECUs all suffer from a common manufacturing defect that causes a loss of activation signal to the main relay, preventing engine system power up or the starter motor activation. Internal ECU malfunction also inhibits reference voltage outputs required for sensor activation. When diagnosing the non-start problem, you will often find that the engine system will fail to communicate with your diagnostic equipment while the engine fails to start/crank-over.

These problems are frequently intermittent to begin but become permanent if not resolved, causing complete and constant non-start.


Other problems encountered with this ECU, though less common than the non-start issue, include running symptoms such as loss of power, cutting out and limp mode activation. The engine management warning light will be illuminated and the message ‘Engine Power Is Reduced’ may appear on the dash.


This ECU is fitted into an array of Vauxhall models, across a variety of engines, including Adam, Astra J, Corsa D facelift models, Corsa E, Mokka and Zafira Tourer C. That’s a huge number of vehicles to suffer from non-starting failure.


You may seek to resolve these issues by purchasing new from manufacturer. However, this will require coding to the vehicle (adding further costs) and will only come with a short one year guarantee.


As market leaders in remanufacture of vehicle electronics we have another, more cost effect solution – rebuild your original ECM/ECU.


We see a substantial amount of these ECU’s coming into us for repair due to malfunction of internal components. Our test and rebuild service is second to none. We can have your Vauxhall Adam/Corsa E engine ECU repaired and back to you, without the need for coding, for a fraction of the cost of a new ECU. Along with a Lifetime Warranty for your peace of mind, this is truly the best option.


Common Failure symptoms:

  • No start / no crank
  • Main relay not powering up
  • No comms to ECU
  • Lose power / cut out
  • Limp home mode
  • Engine management light
  • 'Engine Power is Reduced' message on dash


Common fault codes:

  • U0100 – Lost Communication With ECU/ECM
  • P0641 – Sensor Reference Voltage “A” Circuit Malfunction
  • P0651 – Sensor Reference Voltage “B” Circuit Malfunction
  • P0697 – Sensor Reference Voltage “C” Circuit Malfunction
  • P06A3 – Sensor Reference Voltage “D” Circuit/Open
  • P0689 – Engine Controls Ignition Relay Feedback Circuit Low Voltage
  • P1682 – Ignition 1 Switch Circuit 2
  • P00C7 – Intake Air Pressure Measurement System
  • P0106 – Manifold Absolute Pressure (MAP) Sensor Performance
  • P262B – Control Module Off Timer Performance


Test and rebuild:

Using our in-house bespoke Hardware In-the-Loop rigs and testing procedures we will identify defects and repair these ECM/ECU’s, providing a full Lifetime Warranty with confidence. We only use OEM or above rated components and our quality control is second to none.



We retain all the original programming from your engine ECU during test and rebuild. So, no need for any programming or coding work once you receive it back



Our rebuild work is world renowned; franchise dealerships and specialists across the globe benefit from our services. Our work defect rate is lower than 0.49% on all our rebuilds, so you can be assured of our very high standard of work.



Lifetime unlimited mileage*


How do I get my unit rebuilt?

To pay for the rebuild select your part number above and then click: Get yours rebuilt

Print the payment/booking confirmation email.

Package the Corsa E/Adam inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received we will test, rebuild and return your engine ECU/ECM with an unlimited mileage lifetime warranty. (if your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping)


What if I don’t want to pay up front?

This is not a problem, if you prefer this option then follow the following steps:

Fill in and submit this test form.

Print the booking confirmation email.

Package the Vauxhall Adam/Corsa E engine ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received, we will test your engine ECU/ECM and call you to advise on the outcome of testing, if your unit is faulty and you choose to go ahead with the rebuild then we will take payment over the phone using a debit/credit card.

We will then rebuild your engine ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this Vauxhall Adam/ Corsa E engine ECU then please contact us.

Vauxhall Products/Services



























Comments on "Vauxhall Adam and Corsa E engine ECU failure - causing non-start"
Richard williams says: 16/09/2023 09:51:22
Vauxhall Adam 2014 key turns dash illuminates and relays click but no engine crank. Takes a couple of times eventually engine starts normally. I have a video if possible to send and confirm before paying for rebuild.
ECU Admin says: 18/09/2023 10:05:14
Hi Richard, perfect contact us and we can take a look at that for you
Darren says: 11/10/2021 21:52:36
I have a Vauxhall mokka 1.4 with the e78 Ecu that I would like checked please faults are no crank , but our diagnostic tool does communicate thanks Darren
ECU Admin says: 12/10/2021 09:26:40
Hi Darren, no problem. Just select your ECU from the following list
Graham says: 01/12/2020 20:56:15
Hello I have a 2015 corsa 1.4 ecflex sometimes I can come out engine cranks over but won't fire come back later pit key in starts 1st time
ECU Admin says: 02/12/2020 09:19:57
Hi Graham, it appears you may have a faulty engine ECU causing intermittent starting as mentioned above. If you would like to send your ECU for test and rebuild please select your part number above to get started.
Tony fulbrook says: 06/10/2019 21:02:17
I have a corsa 2008 1.2 cdti,I cranks some times but never starts Sometimes you go to crank and nothing And cant communicate with ecu. Kind regards Tony
ECU Admin says: 07/10/2019 09:48:22
Hi Tony, this ECU is for the Corsa D (facelift 2010-2014), we can help with your 08 Corsa just select your part number from the following list:
Leave a Comment All fields are required*