GLA 45 2019 gearbox stuck in Neutral
02-10-2021, 10:54 AM
#1
GLA 45 2019 gearbox stuck in Neutral / Temperature related
Hi, my gearbox started to show a weird behavior of getting stuck in Neutral for a couple hours before releasing it.
Unable to identify what triggers it but it seems to be gearbox oil temperature related when as soon as I turn off the car, open the door or press P at the gear selector the hid display shows “Transmission not in P Risk of vehicle rolling away” red message - and there is short beep and you notice that the car very quickly shift from P to N and stays there. But if the gearbox oil temperature is cool ... everything works just fine.
An additional detail the hid shows N, the gear shift selector shows N ... but car doesn’t move at all - as the gearbox is not actually in Neutral (disengaged)... the gearbox most seems to be actually in Park Mode, which explains why the engine accepts to be turned off.
Also noticies that the normal behavior of the car is that when you switch the agility selector to either S or S+ the engine will automatically rev up (in idle) But when the car is in this “faulty mode” you see the agility mode changes in the Hid and selector - but the car does not change its idle rev at all.
so ..
1) already tried to disconnect the accumulator but it did not works - waited for about 5 min.
2) used and Autel Maxisys to reset the fault code (DTC 081C00) but it does work. It beeps and moves from N to P and back form P to N super fast
3) tried to disconnect the gear selector lever and kept it disconnected for about 5 min. But nothing changed
the only fix to this odd behavior is to leave car parked / locked for a few hours. And after that everything returns to “normal” ... until the gearbox oil temperature raises and Park the gearbox
by the way, there is a note on the manual mentioning that we should press the Park button on the shift selector before turning off the car and the eventually it could get stuck in N ... but after approx 30 min it should return back to normal. But in my case I have to wait over 2 hours to get it back to normal
Have anybody experienced anything like this ?
any thoughts?
Unable to identify what triggers it but it seems to be gearbox oil temperature related when as soon as I turn off the car, open the door or press P at the gear selector the hid display shows “Transmission not in P Risk of vehicle rolling away” red message - and there is short beep and you notice that the car very quickly shift from P to N and stays there. But if the gearbox oil temperature is cool ... everything works just fine.
An additional detail the hid shows N, the gear shift selector shows N ... but car doesn’t move at all - as the gearbox is not actually in Neutral (disengaged)... the gearbox most seems to be actually in Park Mode, which explains why the engine accepts to be turned off.
Also noticies that the normal behavior of the car is that when you switch the agility selector to either S or S+ the engine will automatically rev up (in idle) But when the car is in this “faulty mode” you see the agility mode changes in the Hid and selector - but the car does not change its idle rev at all.
so ..
1) already tried to disconnect the accumulator but it did not works - waited for about 5 min.
2) used and Autel Maxisys to reset the fault code (DTC 081C00) but it does work. It beeps and moves from N to P and back form P to N super fast
3) tried to disconnect the gear selector lever and kept it disconnected for about 5 min. But nothing changed
the only fix to this odd behavior is to leave car parked / locked for a few hours. And after that everything returns to “normal” ... until the gearbox oil temperature raises and Park the gearbox
by the way, there is a note on the manual mentioning that we should press the Park button on the shift selector before turning off the car and the eventually it could get stuck in N ... but after approx 30 min it should return back to normal. But in my case I have to wait over 2 hours to get it back to normal
Have anybody experienced anything like this ?
any thoughts?
Last edited by Cdbr74; 02-13-2021 at 08:04 PM. Reason: Update symptoms
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meicalnissyen (04-20-2021)
04-20-2021, 03:10 PM
#2
Member
Well written post, this forum is dead. While not thriving, try here and good luck, I have a 19 as well.
https://www.glaowners.com/forums/mer...amg-forum.210/
https://www.glaowners.com/forums/mer...amg-forum.210/
