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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Help!! Car Problems~Limp mode & Valve Problem??



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      07-08-2013, 02:09 PM   #1
Murdered
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Help!! Car Problems~Limp mode & Valve Problem??

Hey Everyone,

I am in some desperate need of some information as this autobody shop is trying to screw me over. A month ago I had BMS power box and AFE intake installed in my 2007 328xi e90.

Scenario:

Yesterday I was driving home on the highway when I hit a hard bump (couldn't maneuver out of the way fast enough) and after I hit the bump, my nav screen went blank and then right after it came back on it said I had the following problems:
1) Brake pads were worn to minimum and needed to be replaced
2) Engine Malfunction- Car could operate but at reduced power

Over the course of 30 min I could not get my car above 10mph when flooring it (I couldnt pull over b/c I was on the bay bridge)

Got my car towed to an auto-body shop and they are telling me that I need to install my stock air box b/c the codes that are triggering red flags relate to the airbox.

I have never heard of a new intake triggering these kind of flags and I think the shop is wrong and are trying to take adv. of me. My guess is that the CPU short-circuited maybe because the battery shifted when I hit the bump?

Can anyone provide some help insight before I call another tow to get my car to another shop?

Thanks!

Last edited by Murdered; 07-09-2013 at 10:27 AM.
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      07-08-2013, 02:18 PM   #2
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No, an intake should not cause those codes. Unless your MAF was damaged in the install or came loose it is likely un related. Another possibility is something came loose and was sucked into the engine but it sounds more like an electrical issue to me. You could try disconnecting the battery to try and reset the system but I don't know if that will do anything.

I would suggest taking it to an Indy, dealer, or inspecting the intake yourself. There is no way I can see an intake causing a computer to read low pad life on the brakes.
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      07-08-2013, 03:07 PM   #3
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That's what I thought. I think the mechanic is trying to screw me. I told him to disconnect the battery as well but I don't think he listened to me. I'm conscerned about the engine malfunction as I can only move 10mph- max considering my brakes are fine.

Thanks for the input.
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      07-08-2013, 03:19 PM   #4
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Your welcome. Before going through all that trouble maybe try asking them to explain why it's caused the codes, and ask for diagrams or a readout of the scan with the diagnostic code breakdown, if they refuse they are likely trying to take you for a ride or aren't someone you want to do business with. Same goes if they give you some bs answer like 'the air filter is not properly directing air to your pads and caused them to wear incredibly fast' because the air filter just doesn't do that lol

Also that's 'limp mode' that's preventing your car from going over 10mph, read up on it a bit. I'm entirely unfamiliar with it other than what it is so I can't help much there
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      07-09-2013, 10:24 AM   #5
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UPDATE: The mechanic is now saying it was the a bad DME module and then shifted his answer to some kind of faulty valve system, or a bad CPU. (wtf?) My car has 72,000 miles on it and he's saying its rare for this kind of problem to occur so early and it will cost something like 400 for the part and additional 1000 for labor (6 hours worth of labor??!)

I know this isnt much information to go on but can anyone provide some insight? I think this mechanic is tryin to take me for a ride.

Thanks
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      07-09-2013, 10:28 AM   #6
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Quote:
Originally Posted by Murdered View Post
UPDATE: The mechanic is now saying it was the a bad DME module and then shifted his answer to some kind of faulty valve system, or a bad CPU. (wtf?) My car has 72,000 miles on it and he's saying its rare for this kind of problem to occur so early and it will cost something like 400 for the part and additional 1000 for labor (6 hours worth of labor??!)

I know this isnt much information to go on but can anyone provide some insight? I think this mechanic is tryin to take me for a ride.

Thanks
I'm not sure about this specific problem, but you could always bring it to the dealer just to see what they have to say and only pay the diagnostic fee. it would be better than shelling out a huge sum without knowing for sure what the problem is.
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      07-09-2013, 10:48 AM   #7
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If the BMS Powerbox was installed a month ago, I have a hunch that the wiring has come loose on it, especially if it occurred right after hitting a bump. That would definitely throw codes and put you in limp mode. The wires won't stay connected well if you don't wrap the electrical tape so the 2 sticky sides are touching. Definitely don't want to wrap the tape around and around the wires because they tend to come unstuck because of engine heat.
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      07-09-2013, 11:37 AM   #8
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I believe the wires were saudered (however you spell it) together, so I dont think they would come loose, but will double check.
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      07-10-2013, 09:54 AM   #9
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Find out anything new on this?
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      07-10-2013, 10:07 AM   #10
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Read the codes yourself and post them here. Maybe that will get you a better idea, which will ultimately lead to the best solution.
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      07-10-2013, 10:23 AM   #11
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Get that car out of there! They are guessing what's wrong with the car based on them changing their answer all the time.
Find out who a reputable service station is on this forum and have it taken to them.
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      07-10-2013, 11:48 AM   #12
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Update: So now they are telling me that sellinoid is bad which in turn caused the valve system or DME module to also go bad. There telling me its gunna cost like $1400 bucks just for the DME module and labor alone- and for the sellinoid (or however u spell it) and valve system is prob gunna cost round $2500- and they are not even 100% positive that this is the problem.

They want me to turn the car back to stock- and like i said previously, all i have had done is an afe stage 2 intake and bms chip, which has been installed for a month with no problems.

Although I will mention that when everything was being installed the car wouldnt start and had to take it to BMW and pretty much get the steering column replaced.

Tired of spending money. I'll try and get the guy to send me the "hard codes."

Best part about this? I am doing my first car rally this weekend, GG2H, and it's looking like I won't be able to go anymore...
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      07-10-2013, 11:49 AM   #13
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Forgot to add: told them to check to see if one of the wires from the BMS powerbox came loose and they said it didnt.
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      07-10-2013, 11:51 AM   #14
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dont give them your car yet! try cleaning the solenoid. there are DIYs on here for that exact problem.
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      07-10-2013, 11:52 AM   #15
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if that doesnt work, i would take it somewhere else anyways. It sounds like a load of BS that your DME would go bad after hitting a bump
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      07-10-2013, 11:54 AM   #16
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They've had the car since Sunday. This happened on Saturday and because the car was in limp mode I couldn't drive it- hence the tow to this place that was recommended by AAA. F*cking AAA wouldn't tow my car cause of "modified ride height."
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      07-10-2013, 11:58 AM   #17
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Yeah that sucks too. when my coolant pump went i scraped real hard.. we dont have tow hooks either because of run flats which also isnt great when trying to get on a flatbed with 6MT
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      07-10-2013, 12:13 PM   #18
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Ok so I got the codes. This is what they told me:

Code 1) 2A77
-Control Module internal fault valvetronic output stage

Code 2) 2A3F
-DME valvetronic actuator motor power supply - DME control module internal valvetronic output stage
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      07-10-2013, 01:42 PM   #19
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You could very well have an issue with the Valvetronic, this is a known issue with the BMW. I had this issue on my 335i at 48K mile and a load of other related issues when it failed. I was teaching my son how to drive a stick in a parking lot and he kept bucking the engine and it threw a bunch of codes and went into limp mode.

If they clear the codes and they comes back immediately, like mine it is most likely what they are saying and this is not a cheap fix depending on what all went wrong when it failed.

Last edited by Maestro; 07-12-2013 at 02:59 PM.
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      07-10-2013, 02:12 PM   #20
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Thats what its looking like to me, I just can't believe a bump in the road would blow the valve system.

And now they are telling me its the centric valve actuator.

My question is if the reset the DME module (which they are we doing as we speak)... would I not be able to run my tune anymore? I'm concerned if they due reset the DME module and then the car works, im scared that this will happen again and that it is just masking the problem.

I rather just get to the root of the problem so when I am on a road trip, like this weekend, the car won't go into limp mode and I and anyone else won't be in danger.

What would the centric valve actuator due to the car?
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      07-10-2013, 02:34 PM   #21
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have it towed to any other place....

And why did you start with a body shop in the 1st place...???

Is is a german car shop or something???
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      07-10-2013, 03:10 PM   #22
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*its a mechanic shop that say they "specialize" in German cars but i dont think they do
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