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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Car in Limp Mode



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      02-12-2013, 04:19 PM   #1
f30er
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Car in Limp Mode

So driving in to work today, I was sitting at a light and the rpms just dropped down to 200 and then came back up to normal. Car immediately went into limp mode and SES. I was pulling into work anyways so just parked the car and went inside. Afterwards, I came back and started the car and it was just in limp mode. Only live 2 miles away so drove home and hooked up the BT scanner, and here's what I got.

-2d2e (Angle of throttle valve - intake pipe underpressure)
-2A87 (Outlet-Vanos)
-3100 (boost pressure control)
-2cf6 (Throttle valve potentiometer 1, plausibility with regard to air mass)
-2f9a (outside temperature sensor)

I cleared the codes since the VANOS & 3100 come up every few months. After clearing, I restarted the car and it was in limp still. Scanned the car again and got:

-2f9a

I didn't notice but yea, my outside temperature says its -40F. Could a malfunctioning outside temp sensor cause my car to be in permanent limp mode?? The 2d2e & 2cf6 haven't returned but I gotta head back to work in a little bit and think they might pop up too. Also, with the crappy weather, been driving long distances the last couple weeks during complete downpours and blizzards so maybe something shorted out somewhere?
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      02-12-2013, 04:24 PM   #2
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Quote:
Originally Posted by e92er View Post
So driving in to work today, I was sitting at a light and the rpms just dropped down to 200 and then came back up to normal. Car immediately went into limp mode and SES. I was pulling into work anyways so just parked the car and went inside. Afterwards, I came back and started the car and it was just in limp mode. Only live 2 miles away so drove home and hooked up the BT scanner, and here's what I got.

-2d2e (Angle of throttle valve - intake pipe underpressure)
-2A87 (Outlet-Vanos)
-3100 (boost pressure control)
-2cf6 (Throttle valve potentiometer 1, plausibility with regard to air mass)
-2f9a (outside temperature sensor)

I cleared the codes since the VANOS & 3100 come up every few months. After clearing, I restarted the car and it was in limp still. Scanned the car again and got:

-2f9a

I didn't notice but yea, my outside temperature says its -40F. Could a malfunctioning outside temp sensor cause my car to be in permanent limp mode?? The 2d2e & 2cf6 haven't returned but I gotta head back to work in a little bit and think they might pop up too. Also, with the crappy weather, been driving long distances the last couple weeks during complete downpours and blizzards so maybe something shorted out somewhere?
Thats a little strange.... what does the intake charge temp read? I'm not sure on the DME logic but it would make sense if it took outside temp data into it somewhere for some reason and if it was way off it would go limp. See if the charge temp is correct or not first
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      02-13-2013, 12:26 AM   #3
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outside temp sensor will cause SES light but not limp mode.
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      02-13-2013, 01:21 AM   #4
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your vanos is causing limp mode change your outlet sensor. and go from there clear codes I'm sure they should stay gone. n54s tend to throw unnecessary codes at times lol
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      02-13-2013, 12:49 PM   #5
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Scanned again today, still in limp, only error code I'm getting is the 2f9a. No VANOS code. Gonna order a new temp sensor and see if that helps...
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      02-13-2013, 01:34 PM   #6
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Originally Posted by sammy_0559 View Post
your vanos is causing limp mode change your outlet sensor. and go from there clear codes I'm sure they should stay gone. n54s tend to throw unnecessary codes at times lol
+1

I once got Vanos codes for a few days and then nothing. Its been 2 years of no Vanos codes, so sometimes things just get wacky.

Its usually our advice to clear all codes and see what comes back before doing anything.

Mike
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      02-13-2013, 01:46 PM   #7
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+1

I once got Vanos codes for a few days and then nothing. Its been 2 years of no Vanos codes, so sometimes things just get wacky.

Its usually our advice to clear all codes and see what comes back before doing anything.

Mike
Sometimes I think N54s throw phantom codes just to troll their owners
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      02-14-2013, 03:12 PM   #8
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Alrite! Here's one for everyone here! Car has been in limp mode now for 3 days. But no loss of power, just a permanent limp mode error on the dash. I clear the codes every couple hours and the only one that keeps coming back is the ambient temp sensor code. But always in limp. Even unplugged the battery last night, this morning, limp mode (with full power).

THEN:
Got annoyed and just washed my car just now cuz it looked like crap with all the salt and dirt caked on. And....lo 'n behold, LIMP MODE GONE!!! Drove it around a little and yup, it hasn't come back....
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      02-14-2013, 03:36 PM   #9
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Quote:
Originally Posted by e92er View Post
Alrite! Here's one for everyone here! Car has been in limp mode now for 3 days. But no loss of power, just a permanent limp mode error on the dash. I clear the codes every couple hours and the only one that keeps coming back is the ambient temp sensor code. But always in limp. Even unplugged the battery last night, this morning, limp mode (with full power).

THEN:
Got annoyed and just washed my car just now cuz it looked like crap with all the salt and dirt caked on. And....lo 'n behold, LIMP MODE GONE!!! Drove it around a little and yup, it hasn't come back....
Car was telling you it was dirty man, they go in to limp dick mode when the car is dirty, no one wants a limp dick man, chicks like it nice and clean.
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