ESP kicking in after speed bumps

Sergiu · 05-26-2021, 02:13 PM

When driving over speed bumps in the Z4, the ESP kicks in very often, disabling acceleration for something like a second or a little more. Happens especially when going over narrower, more abrupt ones, even at speeds as low as 15 km/h (9 mph), as soon as the rear wheels pass the bump. I can go over the same speed bumps with the 5 series at double the speeds and everything is fine, so I guess this is not normal behavior. Any idea what might be causing it?

KennyP · 05-27-2021, 02:35 AM

Im thinking towards wheelspeed/abs sensors and reluctor rings. Have seen some videos on them causing problems on 3 series and 1 series... sensor going against the ring... ring corroding and then touching and rubbing the sensor etc. There could be codes stored. So i would check and read them first.

Sergiu · 05-27-2021, 06:30 AM

Thanks for the info!
I have been to the dealer for some scheduled service operations recently, I would think they checked the ECUs for fault codes, but I really can't trust them. I guess I will have someone else have a look (I haven't managed to read fault codes yet, it's much more difficult than I expected after my experience with VCDS on VW).

05-26-2021, 02:13 PM	#1
Sergiu New Member 2 Rep 16 Posts Drives: 2016 Z4 28i, 2014 520D Join Date: Mar 2021 Location: Romania iTrader: (0)	ESP kicking in after speed bumps When driving over speed bumps in the Z4, the ESP kicks in very often, disabling acceleration for something like a second or a little more. Happens especially when going over narrower, more abrupt ones, even at speeds as low as 15 km/h (9 mph), as soon as the rear wheels pass the bump. I can go over the same speed bumps with the 5 series at double the speeds and everything is fine, so I guess this is not normal behavior. Any idea what might be causing it?
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05-27-2021, 02:35 AM	#2
KennyP Lieutenant 147 Rep 463 Posts Drives: 2009 Havana E89 Z4 Sdrive35i Join Date: Apr 2016 Location: Estonia iTrader: (0)	Im thinking towards wheelspeed/abs sensors and reluctor rings. Have seen some videos on them causing problems on 3 series and 1 series... sensor going against the ring... ring corroding and then touching and rubbing the sensor etc. There could be codes stored. So i would check and read them first. __________________ 2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.
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05-27-2021, 06:30 AM	#3
Sergiu New Member 2 Rep 16 Posts Drives: 2016 Z4 28i, 2014 520D Join Date: Mar 2021 Location: Romania iTrader: (0)	Thanks for the info! I have been to the dealer for some scheduled service operations recently, I would think they checked the ECUs for fault codes, but I really can't trust them. I guess I will have someone else have a look (I haven't managed to read fault codes yet, it's much more difficult than I expected after my experience with VCDS on VW).
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