08 a-class ecu rom failure P0605

timb138

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Hi All.
Can anyone please help with my current dilemma.

I bought an 08 A-class 1.5 petrol with 40K on the clock 6 months ago from a well known giant car supermarket, it has the later type siemens VDO ECU (the one without the air flow meter) part numbers are a2661530391, 5wk90974 (07), a2204463140 (but according to merc parts the correct replacement ecu is a2204463340 and they have no record of the part number currently fitted on their system).

Last month the car started stalling when approaching junctions etc and sometimes would restart ok, other times I`d have to wait up to half an hour.

My local merc dealer in guildford has diagnosed a ROM failure in the ecu, error code P0605 and have quoted almost £2k for a new unit and programming but eventually agreed to recode a used one to the car for £120 /hr without any guarantee on the work.

Anyway after sending the original to ecutesting for a second opinion they confirmed the ecu ROM was at fault but couldn't fix it and sent it back.

I got an identical ecu from a used spares place and gave it to the merc dealer who after trying to programme it said it needed to have the donor car data removed from it first.

I have contacted every ecu specialist i can find and some say they cant fix it, others say they can't transfer the data from the original rom as the defect would be transferred to the new unit, some say they need the blank data from a new unit to programme onto it and one says it will be fine and they can copy it across. Another ecu remanufacturer has one for £500 which apparently can be programmed via the OBDII port but when I quizzed them their units aren't virgin either and also have the donor cars data on them.

So are Mercedes being difficult by stating they cant wipe it or does every one have to go for the new merc item?

Can anyone confirm if the ROM failure is likely to be a software fault in the ecu which would be transferred, A chip failure so the data should be fine etc.

If it is just a software problem on the original unit, can't the original be reprogrammed by the dealership?

Any other suggestions to get the car back on the road? I have thought about getting all the coded parts from a single donor but so far I haven't found one and am not sure if it would work in any case.

BTW We were however offered a reduction of 4% on the cost of the new ecu by mercedes due to the cars low mileage and it only being 5 years old:p.

Any help would be greatly appreciated as there is no way I can raise £2k at the moment.
 
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timb138

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Many thanks Nailzy, I hadn't found that company.

I called them and they think they can sort out the problem so fingers crossed!

Will post progress later.
 

Nailzy

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Cool keep us updated buddy. They are a local firm based in South Wales and have a pretty good rep with local auto firms and DPF removals.
 

rhud

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I have NO technical knowledge whatsoever. However....my 1st A Class (2007 petrol manual) was stalling at odd times,usually at junctions. MB dealer said this was a known (software) issue,re-programmed it and no further problem.
 
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timb138

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I have NO technical knowledge whatsoever. However....my 1st A Class (2007 petrol manual) was stalling at odd times,usually at junctions. MB dealer said this was a known (software) issue,re-programmed it and no further problem.
Hi Rhud,
Thank you for highlighting this to me, I am rapidly losing confidence in my local merc dealer. Can you let me know who you spoke to please so I can see if they're a bit more experienced in this area?

Thanks
 

rhud

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A160 BlueEfficiency Avantgarde SE 2010
Hi Rhud,
Thank you for highlighting this to me, I am rapidly losing confidence in my local merc dealer. Can you let me know who you spoke to please so I can see if they're a bit more experienced in this area?

Thanks

The car was within the 3 yr warranty period at the time and the glitch was diagnosed and fixed by Mercedes Harrogate in North Yorkshire. Can't remember who I dealt with.
 
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npuk

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As it only started last month I doubt you have the same problem and IIRC it affected earlier years only.
 
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npuk

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I say the above also as ECU testing have confirmed the fault but if you want a second opinion try a local independant that specialises in MB or Tony Purslow Mercedes-Benz (Guildford) get a few recommendations on here.

Some recommendations on independants in this thread: http://forums.mercedesclub.org.uk/showthread.php?t=99131
 
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timb138

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Thanks again npuk, I tried a few of the independents but they have not had issues with these ecu's and as ecu testing have had a look and bba reman cant help then they have no other recommendations to give.

Tony Purslow have had the car for the past month and are trying to be as helpful as possible but unless I get the replacement wiped they say they cant do anything except sell me a new ecu.

I was hoping that someone had experience of this fault but it would seem I'm uniquely lucky, perhaps I should but a lotto ticket this week to see if it carries over?

Fingers crossed that rolling motion can pull the cat out of the bag or I`ll be buying a banger to run around in until I can save some pennies and get a new ecu.
 
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