Jump to content

2006 audi a3 p0606 p0688 p2146 p2149 no start


Recommended Posts

I've been trying to chase this issue for about 4 months now. it started out as intermediate not starting and i would get the codes p2146 and p2149 (fuel injector group A supply voltage circuit/ open) (fuel injector group B supply voltage circuit/ open) but id be able to get it to start by disconnecting the battery. Eventually it got to the point where the epc light came on, i lost all power and the car died and did not start again. I then went on to replace the fuel injectors and fuel pump relay, still wouldn't start. At this time I was also getting codes for improper voltage to ecu and sometimes no communication to ecu, this turned out to be because the battery was completely fried and once i replaced the battery the codes went away. Then decided to try and do the fuel pressure regulator, the car started and ran but i was then getting codes for fuel pressure regulator performance 2 and low fuel pressure at the rail. I then went on to replacing the high pressure fuel pump, this seemed to fix mostly all the issues the car was having as it drove amazing and pulled very strong with no fuel cuts or anything. I drove it an hour home from my buddies shop and the car died as soon as i got home, epc light came on lost all power and it died. I scanned the codes and I was getting a p0688 (ECM/PCM power relay sense circuit/ open) as well as p2293 (fuel pressure regulator valve (N276) mechanical malfunction) the N276 sensor arrived cracked when i bought it but i was able to super glue it in place (not a permanent fix) so i figured thats why i was getting that code. I decided to replace the fuel pump relay (also the ecu power supply relay) and the car started right up and ran great. I went to take it for a test drive and it ran great with no check engine light for about 15 minutes and then it started to run like !Removed! and then epc lost power and car died. i scanned it and I was then getting the same code again the P0688 but also im getting P0606 (ECM/PCM processor). i suspect my ecu has gone bad or i have some type of wiring issue, or short in the wiring thats causing the ecu power supply relay to go bad. im honestly stumped and do not know what to do with this car anymore, im about ready to give up. Side note: I have a used ecu off another A3 8p but i can not use it as it still has the immobilizer in it and I do not have the proper scan tool to rewrite the immobilizer code. I would like to know what chip inside the ecu is the immobilizer, I looked everywhere and I couldnt find anything on this specific ecu. 

Link to comment
Share on other sites


Defective batteries are a well known cause for these sort of problems. Was your replacement battery new or secondhand? If the latter get a new one, then report back.

Link to comment
Share on other sites

I'd definitely change the sensor that's been superglued. Also I'd recommend getting an auto electrican to take a look as you've replaced a good portion of the faulty components. If it is the ecu you'll need to get it coded to the car. 

Link to comment
Share on other sites


1 hour ago, cliffcoggin said:

That does not answer my question which I shall repeat: was it new or secondhand?

The battery was new and I replaced it with another new battery. 

Link to comment
Share on other sites

50 minutes ago, Steve Q said:

I'd definitely change the sensor that's been superglued. Also I'd recommend getting an auto electrican to take a look as you've replaced a good portion of the faulty components. If it is the ecu you'll need to get it coded to the car. 

I am changing that sensor today and also I’ve gotten a vag cable that is able to turn off immobilizer so I will be able to use my used ecu in the car to see if that fixes my issue 

Link to comment
Share on other sites

16 minutes ago, josh.13baker said:

I am changing that sensor today and also I’ve gotten a vag cable that is able to turn off immobilizer so I will be able to use my used ecu in the car to see if that fixes my issue 

That's good then 🙂 please keep us posted on how you get on 🙂

Link to comment
Share on other sites

13 hours ago, Steve Q said:

That's good then 🙂 please keep us posted on how you get on 🙂

Changed the sensor on fuel pump and swapped the ecus and still nothing same issues. 

Link to comment
Share on other sites

4 hours ago, josh.13baker said:

Changed the sensor on fuel pump and swapped the ecus and still nothing same issues. 

I'd be getting it to an auto electrican. 

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share




×
×
  • Create New...

Forums


News


Membership