X5 3.0D Replace ECU

[powers1]

Originally Posted by Oscarguitar

Hi,

I have already raised this in another thread but in relation to another issue so appologies if you have read this already.

Just before taking my X5 into an indy last week to have an injector replaced and a repair to the A/C (stone damage) I had two errors flash up. <Fuel Injection System> <Trans Fail Safe>. I though they might be related to the injector, mentioned it to the service manager who said they would check it out.

Picked up the car on Friday, went to start it same errors. Diagnosic identified low voltage from ECU, suspected a low battery. I changed the battery on Saturday (5 1/2 years old) with a quaility replacement expecting all to be well.

Sunday the error codes appeared again.

Took the car back to the indy today. Put back on diagnostic kit. First thought it was the cam sensor relay, however on further investigation (they bypassed the relay) the fault was traced to the ECU. 12 volts going in 6 volts coming out to transmission and fuel injection pins. No error codes as it is internal. (I'm sure there is a more technical explanation but that was the gist of it)

They say I will have to replace the ECU which is about £1200, on top of the £1100 I spent last week.

Has anyone had a similar experienece and does this sound reasonable? I do trust them as they are a quality outfit but having searched around I would rather it was a sensor or bad earth connection! I dont want to spend all that money and then find it is something else costing more money.

Also if it is the ECU would you consider a repair rather than an new one?

Any advice would be really helpful.

Can you give us some more feedback?As Big wave said ,ECU sends out 5V !
What work was done on your car that you paid £1100 for?Did you pay all that for an injector replacement and A/c fix?Also .apart from the errors trans fail and Fuel inj,how does the car perform?Did someone try to remap your car?
If it is in fact ECU fault,before you buy a new one ,you should get it flashed back or updated with software,,and then see if you still get errors.