Error Code 2B28 after replacing both TAs

dave7101 · 05-17-2018, 04:27 PM

Coming back as a "throttle return springs Test bank 2" error. I replaced both TAs four days ago with rebuilds from Jason in the UK

The original errors with with Bank 2 as well, but replaced both and cleared codes and all was well until this morning. Getting the above error, and limp mode.

Some research seems to suggest that throttle position sensors on the rail may be an issue? Can anyone help point me in the right direction.

Could the rebuild TA be bad? Or am l looking at something else. Car is all buttoned back up again, so want to get a solid plan before i take everything back apart.

Thanks

rcracin · 05-17-2018, 05:27 PM

Swap the throttle actuators bank to bank to see if the code comes back and on which bank.

dave7101 · 05-17-2018, 05:29 PM

I was afraid that might be the next step... pain in the ass after having everything apart and back together again.

thanks

Quote:

Originally Posted by rcracin

Swap the throttle actuators bank to bank to see if the code comes back and on which bank.

rcracin · 05-17-2018, 05:54 PM

Imagine swapping actuators twice just to find out the rear plug on the tps wasnt plugged in all the way. Guess which genius did that.

dave7101 · 05-18-2018, 06:17 AM

Ouch.... i feel your pain on that one... and it will be the first thing i check

Quote:

Originally Posted by rcracin

Imagine swapping actuators twice just to find out the rear plug on the tps wasnt plugged in all the way. Guess which genius did that.

PAM3Guy · 05-18-2018, 06:37 AM

Quote:

Originally Posted by rcracin

Imagine swapping actuators twice just to find out the rear plug on the tps wasnt plugged in all the way. Guess which genius did that.

Don't feel so bad. My dealer did something similar last fall when they replaced one of my TA's (free under the emissions CA warranty in my state). I think as those connectors age they get a little more reluctant to go back together.

deansbimmer · 05-18-2018, 08:05 AM

Yes the position sensors have been known to be faulty. Often times not plugged in all the way at the sensor or at the connector lead a few inches up. They also need to be calibrated if replaced.

05-17-2018, 04:27 PM	#1
dave7101 Enlisted Member 4 Rep 33 Posts Drives: 2013 M3 Convertible LCI Join Date: Sep 2013 Location: Ontario, Canada iTrader: (0)	Error Code 2B28 after replacing both TAs Coming back as a "throttle return springs Test bank 2" error. I replaced both TAs four days ago with rebuilds from Jason in the UK The original errors with with Bank 2 as well, but replaced both and cleared codes and all was well until this morning. Getting the above error, and limp mode. Some research seems to suggest that throttle position sensors on the rail may be an issue? Can anyone help point me in the right direction. Could the rebuild TA be bad? Or am l looking at something else. Car is all buttoned back up again, so want to get a solid plan before i take everything back apart. Thanks
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05-17-2018, 05:27 PM	#2
rcracin Major 1277 Rep 1,319 Posts Drives: M3 Join Date: Jul 2012 Location: NYC iTrader: (4)	Swap the throttle actuators bank to bank to see if the code comes back and on which bank.
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05-17-2018, 05:54 PM	#4
rcracin Major 1277 Rep 1,319 Posts Drives: M3 Join Date: Jul 2012 Location: NYC iTrader: (4)	Imagine swapping actuators twice just to find out the rear plug on the tps wasnt plugged in all the way. Guess which genius did that.
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05-18-2018, 08:05 AM	#7
deansbimmer BimmerPost Supporting Vendor 4324 Rep 3,023 Posts Drives: 2011 E93 M3 Join Date: Nov 2014 Location: DFW, Texas iTrader: (17) Garage List 1988 E30 M3 [0.00] 2006 E46 M3 [0.00] 2024 X7 M60i [0.00] 2011 BMW M3 [0.00]	Yes the position sensors have been known to be faulty. Often times not plugged in all the way at the sensor or at the connector lead a few inches up. They also need to be calibrated if replaced.
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