Question about Audi A4

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2001 A4 V6 ECU# 3B0 907 551 BP.Got DTC code P0605 about a month ago.No problems,CEL went away after a couple of run cycles.Then yesterday got CEL again,same code.Thought I'd just run it out,it was working perfect.Then shut it down for 10 minutes and wouldn't start.No self check CEL when ignition turned on.Pulled one of the fuses for the module and then pushed it back in. CEL self check popped back on and car started perfect.Now everytime I try to start it when it's hot same thing happens.I pull the fuse,wait a minute,put the fuse back in and away we go.Car runs exceptional.Does this sound like a bad relay?A weak battery?Or could it actually be a bad ECU?I've checked as many connections as I can find and they all seem good.ECU itself is spotless and no water has ever gotten in there.If it's a bad ECU will one with a # ending in BQ work with my car that ends in BP?I'm checking codes with a generic code reader.Don't have access to Vag-Com.

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  • bill.i.be Jun 17, 2009

    Thanks for the reply.What about relay?Battery?The code only popped when first starting car,not while running.To me it seems that when I shut power off to the ECU by pulling the fuse it reboots.Once it's up and running car is good as gold.I know where there is a BQ ECU in good shape.60K on it.Will I be able to drop it in or have to go to the thieves at Audi to have them initialize it.I live a long way from the dealership.

  • bill.i.be Jun 17, 2009

    Stealership is right!!..I don't go there unless it's absolutely the last resort.I'm in Canada and Audi has a license to print money.The only thing I worry about with dropping in a new ECU,is the immobilizer.

    This has only seemed to come on since the weather finally got warm.This morning when the car was cold it started without pulling the fuse.But after a 20 minute drive and quick stop it happened again.It's parked now,and I expect it will start right up in the morning.I'm still not convinced that it's not a low power situation or something that causes the ECU to not boot up.Low battery voltage maybe?I know that they can be sensitive to low voltage.It's just so difficult to diagnose out here in the sticks.

    Many thanks.I'm gonna leave this Q open in case someone who has seen the exact problem before gives me the 'Magic Answer' that will cost me nothing to repair.But I'm with you,that it probably is a bum ECU.


  • bill.i.be Jun 17, 2009

    Good answer from rogrrabbit.Thanks my man!!.Anyone else have a thought on this problem?

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It seems, all fuel caps are vented, and they can go bad. When the vent isn't operating properly, no air can get into the tank to replace the area where the fuel was before it went through your pump and fuel system. If there's no air coming in, it will create a vacuum that will eventually overpower the pump, and you won't get any fuel. I've also come across these kinds of issues with my car, so while it's admittedly different, the issues were close to the same...it was always something.

Someone recently recommended grabbing the electrical schematics and checking on the grounds to make sure they aren't corroded, because a poorly grounded electrical system will wreak havoc on an ECU. Again, I could be a million miles away and dead wrong, but it's a free/cheap fix to look and clean them up.


good luck.
saumya.

Posted on Jun 17, 2009

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This is telling me that you need a new ECU, 200 bucks can buya used one. The one ending BQ should work fine as long as its in good repair. I see the Generic code LOL it would be better to have the Audi reader for better results but this will work.

Posted on Jun 17, 2009

  • Roger Campbell
    Roger Campbell Jun 17, 2009

    Yes it should drop right in. The Battery is not the problem because you can start it. The relay is not an issure. I feel the new ECU should solve the problem. The stealerships may be able to give you an insight of the correct part from a factory code reader. Good Luck.

  • Roger Campbell
    Roger Campbell Jun 17, 2009

    Thats cool good luck

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The speedo on 95 series cars have a VSS,
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http://www.troublecodes.net/toyota/

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sure would.
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i looked up your car at alldata.com so could you.
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