BMW 1 Series (F20/21) 116i & 118i engine ECU fault - causing engine misfire

BMW 1 Series ECU fault

This engine ECU is a very common failure for the BMW 116 & 118 Sport/M Sport built from 2011 onward. When the ECU fails it will cause the engine to lose power and misfire on one or more cylinders, with fault codes stored for cylinder misfires and/or injector shutdown. To diagnose a failed ECU check the primary ignition signal supplied to the ignition coil with an oscilloscope, the signal will be weak or not present if the ECU has failed.

 

The root-cause of the failure is normally due to a faulty ignition coil going short circuit and drawing excessive current through the ECU, this in turn overloads the ignition coil activation circuits within the ECU. Replacing the ignition coil alone will not cure the problem and the shorted-out ECU may even overload the new coil, causing a vicious cycle of Coil-ECU-Coil damage. It is always best to check for an ignition primary signal to the coil before replacing it, if there is no primary output signal from the ECU then it can be assumed the ECU is damaged, in this instance the ECU fault should be rectified BEFORE fitting a replacement coil to avoid damaging the new coil with a faulty ECU. If in doubt it is always best to replace the ignition coil with a new one when refitting the rebuilt ECU if you suspect the coil could have been fitted when the ECU was faulty.

 

We can rebuild your own BMW 1 Series ECU with an unlimited mileage lifetime warranty* for a small fraction of the cost of a new unit. You only get a one-year warranty from the manufacturer when you buy a new ECU so you really are getting the best of both worlds - a cheaper alternative to a new ECU with a much longer warranty to boot. 

 

Common Failure symptoms:

  • Engine misfiring constantly
  • Loss of power 

 

Common fault codes:

  • 140001 - Misfire several cylinders fuel injection is switched off
  • 140010 – misfire multiple cylinders detected
  • 140101 - Misfire cylinder 1 injection shut down
  • 140110 – Misfire cylinder 1
  • 140201 - Misfire cylinder 2 fuel injection is switched off
  • 104210 – Misfire cylinder 2 detected
  • 150102 - Ignition cylinder 1 combustion time too short
  • 150202 – Ignition cylinder 2

 

Affected Vehicles:

  • BMW 116i/Sport/M Sport 2011 - 2015
  • BMW 118i/Sport/M Sport 2011 – 2015
  • BMW 114i Sport 2011 – 2015

 

Common failing part numbers:

 

(this is a list of common failing part numbers related to this fault, if you do not see yours then you can see the full range of BMW 1 Series ECU part numbers).

 

Test and rebuild:

We fully test every ECU before and after the rebuild using our HIL (Hardware In-the-Loop) vehicle simulators, these simulators allow us to test your ECU under all real-world load conditions. This ensures that your ECU meets or exceeds the OEM specifications. We replace all common failing components with versions that are higher rated than standard, so you can be assured that once your ECU has been rebuilt it will perform as good as, if not better than a brand new unit.

 

Programming:

There is no need for any programming once you receive your rebuilt ECU, just plug in and away you go.

 

Quality:

Our ECU test and rebuild services are used by Franchise main dealers and specialist workshops all over the globe, so you can be assured of our very high standard of work.

 

Warranty:

Lifetime unlimited mileage*

 

How do I get my unit rebuilt?

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

Print the payment/booking confirmation email.

Package the BMW 1 Series 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 BMW engine 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)

 

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 BMW 1 Series 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 unit and call you to advise on the outcome of testing, if your ECU 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 BMW engine ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this BMW 1 Series engine ECU then please contact us.

BMW Products/Services

1 SERIES

2 SERIES

3 SERIES

4 SERIES

5 SERIES

6 SERIES

7 SERIES

K1200

R1200

R1200GS

S1000RR

X1

X3

X5

X6

Z3

Z4

Comments on "BMW 1 Series (F20/21) 116i & 118i engine ECU fault - causing engine misfire"
LUIS DANIEL CUELLAR GONZALEZ says: 11/7/2019 3:14:13 AM
Buen dia mi carro me marca el codigo 140310 falla y se va el cilindro 3 pero la chispw de la bobina sigue costante y no fallaba el carro si sera la computadora??? [Translated] Hi there, my car has fault code 140310 stored and the engine is misfiring on cylinder 3, but there is good spark on that cylinder. Could it be the ECU that is faulty???
ECU Admin says: 11/7/2019 10:36:13 AM
Hi LUIS DANIEL CUELLAR GONZALEZ, this engine ECU is a very common failure for the BMW 116 & 118 built from 2011 onward. When the ECU fails it will cause the engine to lose power and misfire on one or more cylinders, with fault codes stored for cylinder misfires and/or injector shutdown (fault code 140310 is common for this). To diagnose a failed ECU check the signal supplied to number 3 injector and primary side of the ignition coil with an oscilloscope, the signal will be weak or not present if the ECU has failed. We will be happy to test your unit and rebuild if it is faulty.
Jacob says: 10/7/2019 1:31:58 PM
My bmw118i 2005 model mis fired and lost power and suddenly stoped now I am told it cannot respond to the diagnostic machine please help
ECU Admin says: 10/7/2019 2:15:33 PM
Hi Jacob, It sounds as though your engine ECU could well be faulty, the fault you are describing is a common ECU failure on the BMW 118i 2005. Firstly I would recommend getting the fault professionally diagnosed to ensure it is actually the ECU at fault and not something else on the vehicle. If it turns out to be your ECU then we can test it for you and rebuild if it is faulty, just select your part number from this list to see full pricing and shipping information: https://www.ecutesting.com/product-catalogue/bmw/1-series/ecu-engine-management/
Leave a Comment All fields are required*