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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Park Assist came to a crashing halt

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      01-08-2020, 03:24 AM   #1
Mandarin Man
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Exclamation Park Assist came to a crashing halt

Hi all, brand new owner of a 2020 G20 330i here, and brand new to this forum. I’ve had my car a few days and am still playing with the toys, but had a shaky experience yesterday. Tried to use Park Assist to reverse into a bay, the car spotted the bay and I tapped the |P| icon to start the process; all fine at this point. The car had reversed 5m or so toward the bay when it applied full brake and stopped with a horrible grinding noise for about 2 seconds from (presumably) the gearbox. Sounded like a manual transmission when you try to force a gear without using the clutch, and scared the cr*p out of me. After 2 secs the engine cut out and showed a message onscreen like ‘DSC Failure’ - I didn’t have time to read it properly because it only showed for a quarter second or so before the whole system rebooted.

When it came back everything worked as normal.

Any ideas? Anybody had anything similar?

Last edited by Mandarin Man; 01-08-2020 at 04:56 AM.. Reason: Clarity
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      01-08-2020, 05:30 AM   #2
Andy3661
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Originally Posted by Mandarin Man View Post
Hi all, brand new owner of a 2020 G20 330i here, and brand new to this forum. I’ve had my car a few days and am still playing with the toys, but had a shaky experience yesterday. Tried to use Park Assist to reverse into a bay, the car spotted the bay and I tapped the |P| icon to start the process; all fine at this point. The car had reversed 5m or so toward the bay when it applied full brake and stopped with a horrible grinding noise for about 2 seconds from (presumably) the gearbox. Sounded like a manual transmission when you try to force a gear without using the clutch, and scared the cr*p out of me. After 2 secs the engine cut out and showed a message onscreen like ‘DSC Failure’ - I didn’t have time to read it properly because it only showed for a quarter second or so before the whole system rebooted.

When it came back everything worked as normal.

Any ideas? Anybody had anything similar?

Hi and welcome to the forum.

DSC stands for Dynamic Stability Control and it works with your ABS which is what the grinding noise would be but a whole load of different factors may cause this issue.

Have a look at this, although old it gives you an idea about DSC but I would ring the dealer and get it in for them to look at.

https://www.cerroneseuropean.com/dsc...e-in-your-bmw/
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      01-08-2020, 07:10 AM   #3
Mandarin Man
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Hi Andy thanks for the info and link. The grinding noise wasn't the ABS, it was a gearbox'y noise that continued for around 2 secs after the car was stationary - like the auto 'box was trying to get back in gear without the clutch. Not saying that's what it was, just what it sounded like - but it was truly horrible to hear on a new car.

Will definitely get the dealer to have a look - I'm presuming this kind of event will be stored in a log somewhere for review?
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      01-08-2020, 09:34 AM   #4
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Quote:
Originally Posted by Mandarin Man View Post
Hi Andy thanks for the info and link. The grinding noise wasn't the ABS, it was a gearbox'y noise that continued for around 2 secs after the car was stationary - like the auto 'box was trying to get back in gear without the clutch. Not saying that's what it was, just what it sounded like - but it was truly horrible to hear on a new car.

Will definitely get the dealer to have a look - I'm presuming this kind of event will be stored in a log somewhere for review?
Any codes or errors that come up will be logged and the dealer will be able to pull it up. Best would be to take this in to get to looked at and avoid using the park assist till it's been fixed.
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      01-16-2020, 12:54 PM   #5
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For those interested I had BMW read out my carkey this morning. There were a litany of 'events' that took place at the same time as this error; most likely all connected to a single issue.

TPMS Fail
DSC Fail
Drivetrain Malfunction: do not continue driving. Engine will not restart once switched off.
Parking Assistant Malfunction: system will now exit. Continue parking manually.
Kernel protection fault: system will restart.

The mechanic had never seen this before but said the car is too new to have built up a database of known faults. He also said the log looks worse than it probably is, most likely the tyre pressure system stopped feeding data to the DSC, which suddenly didn't know which way was up and crashed, which would/could have caused the drivetrain malfunction as the system thought the wheels were all turning at different speeds. After these it's fairly logical that the parking assistant thought bugger this and quit as well. He'd never seen Kernel protection fault before but figured it was the ECU trying to deal with data it had never seen before and crashing.

The mechanic did ask if the sound I heard could have been the ABS 'chattering' - the car will do this if it thinks wheels are slipping which would be logical after the TPMS and DSC failure, similar to what Andy3661 said above. He said if this is a software fault it could continue after the car is stationary. I still don't think so (still think it's gearbox) but it's a possibility.

The car's going into the shop early next week to have detailed diagnostics done, but the mechanic isn't that hopeful - he said they probably need to catch it misbehaving to know what went wrong.
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      01-16-2020, 03:21 PM   #6
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Quote:
Originally Posted by Mandarin Man View Post
For those interested I had BMW read out my carkey this morning. There were a litany of 'events' that took place at the same time as this error; most likely all connected to a single issue.

TPMS Fail
DSC Fail
Drivetrain Malfunction: do not continue driving. Engine will not restart once switched off.
Parking Assistant Malfunction: system will now exit. Continue parking manually.
Kernel protection fault: system will restart.

The mechanic had never seen this before but said the car is too new to have built up a database of known faults. He also said the log looks worse than it probably is, most likely the tyre pressure system stopped feeding data to the DSC, which suddenly didn't know which way was up and crashed, which would/could have caused the drivetrain malfunction as the system thought the wheels were all turning at different speeds. After these it's fairly logical that the parking assistant thought bugger this and quit as well. He'd never seen Kernel protection fault before but figured it was the ECU trying to deal with data it had never seen before and crashing.

The mechanic did ask if the sound I heard could have been the ABS 'chattering' - the car will do this if it thinks wheels are slipping which would be logical after the TPMS and DSC failure, similar to what Andy3661 said above. He said if this is a software fault it could continue after the car is stationary. I still don't think so (still think it's gearbox) but it's a possibility.

The car's going into the shop early next week to have detailed diagnostics done, but the mechanic isn't that hopeful - he said they probably need to catch it misbehaving to know what went wrong.
Let's up they can identify the issue. Always the case when in the garage and doesn't show the fault and can't replicate it.
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