Corsa D ECU repair – No communication with engine ECU solved.

The ACDelco E83 and ACDelco E78 engine ECUs are commonly known to fail, causing your Vauxhall Corsa D to develop several faults that affect its reliability. This failure can lead to a loss of communication with the engine ECU, making it difficult and sometimes impossible to diagnose the problem with diagnostic equipment. In this case, your vehicle will store the code “U0100: No communication with engine ECU”, which will indicate your Corsa D’s ECU needs to be repaired.

Coupled with the "no communication with engine ECU" fault, your Corsa may also struggle to start. While this non start issue may occur intermittently at first, chances are it’ll worsen unless resolved. On top of that, you’ll likely experience symptoms such as the engine cutting out, car entering limp mode, and the engine management light being on.

What causes the ‘no communication with engine ECU’ fault?

A loss of communication with the engine ECU typically stems from internal component failures within the ECU that prevent the activation of the main relay. When the main relay is not activated, your Corsa will not power up and unless the ECU is repaired, these faults will constantly reoccur.

When your E83 and E78 ECUs malfunctions, you have two options.

First, you can buy a brand-new ECU from the manufacturer. This option has several downsides like exorbitant prices, extra coding costs, long wait times, and limited warranties. Sadly, a brand-new ECU will also come with the same internal defects that caused the failure in the first place.

A second and more beneficial option would be a repair of your ECU. With this option, you can have your faulty Corsa D ECU tested and repaired in 2-3 three working days. We do this using better-than-OEM-standard components at a fraction of the cost of a new one and fully re-build the unit. This option comes with a lifetime warranty and no need for coding the ECU back to the vehicle. 

The second option is your best bet.

Vehicles affected by E83 ECU Failure

Unlike the E78 ECU fitted to both petrol and diesel Vauxhall vehicles, the E83 is exclusively fitted to petrol models. The E83 ECU is commonly found in Vauxhall models, including the Corsa, Meriva, Adam, Zafira, Astra, and Insignia, as well as the Chevrolet Aveo and Nissan Juke produced between 2005 and 2019.

Common fault codes

• U0100 – Lost communication with engine ECU.
• P0300 – Engine misfire detected cylinder 4.
• P0689 – ECM relay control.
• P1682 – Ignition circuit defective.
• U2100 – Can bus malfunction.
• U2105 – Can bus no communication with engine control module.

Vehicles affected by E78 ECU Failure

The E78 ECU is commonly fitted to Vauxhall (Corsa, Mokka, Adam, Zafira, Astra, Insignia, Ampera, and Cascade) and Chevrolet (Aveo and Trax) vehicles produced from 2005 to 2020.

Common fault codes

Besides the U0100 ‘no communication with engine ECU’ fault code, a failure of this ECU can also result in the following fault codes:

• P1682 – Ignition 1 switch circuit 2.
• P0641 – 5V reference 1 circuit.
• P0651 – 5V reference 2 circuit.
• P0697 – 5V reference 3 circuit.
• P06A3 – 5V reference 4 circuit.
• P0689 – Engine control relay – sense circuit low.
• P262B – Control module power off timer performance.
• P0686 – Relay ignition monitor low voltage.
• P0685 – Main relay voltage low.

Location on the vehicle:

The Vauxhall Corsa ECU is located in the engine bay at the side of the battery.

Test and rebuild:

Each E83 and E78 ECU we receive undergoes thorough testing using our Hardware-in-the-loop testing rigs custom-built to simulate real-word loads and driving conditions. First, we identify the faults and defects with your ECU. Next, we rebuild it using higher quality components guaranteed to outlive the vehicle. Lastly, we return it better than the original and with lifetime warranty.

Programming:

During the rebuilding process, we preserve the original information of your unit. All you’ll need to do when you receive it is plug and play.

Quality:

Owing to our strictly-followed quality control measures, we boast of a 0.49% work defect rate across all our rebuilds, enabling us to confidently provide you warranty for life.

Warranty:

Lifetime unlimited mileage*

How do I get my unit rebuilt?

To pay for your Corsa ECU repair click the Shop Now link above, select your part number, and click: Get yours rebuilt.

Print the payment/booking confirmation email.

Package the Vauxhall Corsa 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, rebuild, and return your E83 and E78 ECU 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).

It’s not a problem if you don’t want to pay up front.

All you have to do is fill in and submit this test form.

After submitting the form, print the booking confirmation email, and follow the packaging and shipping instructions above.

NOTE: If you choose not to pay upfront, we will test your ECU and call you to advise on the outcome of the test. We will only take payment over the phone using a debit/credit card IF you choose to go ahead with your Corsa ECU repair.

If you require further information, then please contact us.