2020 G63 Grinding Gears/Transmission Issue
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Junior Member
Joined: Nov 2019
Posts: 45
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2020 g63
2020 G63 Grinding Gears/Transmission Issue
Has anyone experienced transmission issues with their 2019/2020 G63? A couple days ago I was on the highway and went to accelerate up a steep hill at roughly 60mph. I was driving in comfort mode and saw that the car was automatically in 7th. The car tried to drop into 6th gear and made a very loud grinding noise for about 15 seconds. The entire time it made the noise the screen showed it was still in 7th and the revs seemed to stall. The engine never shut off and no warning lights appeared so when I got to flat ground I tried shifting manually. I shifted up into 9th and tried accelerating and the engine lost power. The live read out of torque and horsepower remained at 0 when I floored the gas and the revs stalled at 1200rpm. I managed to drive it home carefully and bring it into the service department at my dealership yesterday. When I brought it in it appeared to be running properly and they said that no fault codes appeared so they are unsure where to look for the problem. Has anyone experienced or heard of a similar issue?
Any help is much appreciated.
Any help is much appreciated.
MBWorld Fanatic!
Joined: Oct 2019
Posts: 5,152
Likes: 1,766
From: Colorado
G550
In Comfort mode the engine start/stop function is active. Maybe the G thought the engine was stopped and tried starting it - thus the knashing gear noise. I always set mine to Sport mode as I dislike the engine start/stop "feature". I plan to ask the dealer to shut this feature off. If he won't, I'll figure out a way to hack it.
Senior Member
Joined: Oct 2018
Posts: 412
Likes: 94
2023 G550
Has anyone experienced transmission issues with their 2019/2020 G63? A couple days ago I was on the highway and went to accelerate up a steep hill at roughly 60mph. I was driving in comfort mode and saw that the car was automatically in 7th. The car tried to drop into 6th gear and made a very loud grinding noise for about 15 seconds. The entire time it made the noise the screen showed it was still in 7th and the revs seemed to stall. The engine never shut off and no warning lights appeared so when I got to flat ground I tried shifting manually. I shifted up into 9th and tried accelerating and the engine lost power. The live read out of torque and horsepower remained at 0 when I floored the gas and the revs stalled at 1200rpm. I managed to drive it home carefully and bring it into the service department at my dealership yesterday. When I brought it in it appeared to be running properly and they said that no fault codes appeared so they are unsure where to look for the problem. Has anyone experienced or heard of a similar issue?
Any help is much appreciated.
Any help is much appreciated.
JM2C, IMHO, and YMMV
Joined: Dec 2019
Posts: 2,220
Likes: 470
From: Marineland FL
'27 EQG deposit, '22 F8 Spyder, '20 Fat Boy
IMHO, if this was my G63, no way would I take that car home until it is properly diagnosed, and repaired. Otherwise, if it's a 'no trouble found' situation, yipes, and good luck! You could find yourself in the middle of the Mojave dessert with the car broke down. For a $200k car, no way would I drive her home without positive diagnostics, and subsequent repair. Might be OK with an $11,000 import, but not with a $200k Merc!
JM2C, IMHO, and YMMV
JM2C, IMHO, and YMMV
Thread Starter
Junior Member
Joined: Nov 2019
Posts: 45
Likes: 16
2020 g63
IMHO, if this was my G63, no way would I take that car home until it is properly diagnosed, and repaired. Otherwise, if it's a 'no trouble found' situation, yipes, and good luck! You could find yourself in the middle of the Mojave dessert with the car broke down. For a $200k car, no way would I drive her home without positive diagnostics, and subsequent repair. Might be OK with an $11,000 import, but not with a $200k Merc!
JM2C, IMHO, and YMMV
JM2C, IMHO, and YMMV
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
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From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Hmmm, seems to me to be something more like a firmware bug in the TCU/ECU because an actual hard error/failure - even a short term one - should have set a code(s) visible to the Star/SDS system.
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A gaggle of MB's
Look... with a copy of that Dealer Service Invoice in hand - which calls out your VIN# - Miles - Date of "Service" (actaully non-Service.
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,032
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From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
Look... with a copy of that Dealer Service Invoice in hand - which calls out your VIN# - Miles - Date of "Service" (actaully non-Service.
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
Thread Starter
Junior Member
Joined: Nov 2019
Posts: 45
Likes: 16
2020 g63
Look... with a copy of that Dealer Service Invoice in hand - which calls out your VIN# - Miles - Date of "Service" (actaully non-Service.
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
Monday morning call (800) 367-6372 and give them that info - and politely/professionally tell them you have a HIGHWAY AFETY ISSUE that your dealer did not resolve at all - you LOST POWER ON THE HIGHWAY - and you are FEARFUL it will happen again !
Forget the well meaning Armchair Voodoo Wizards here - you a HIGHWAY SAFETY ISSUE - you are a GREAT GUY - and your Dealer Service Dept are sh*tbirds..
Mercedes Customer Care will give you a Report # - and Mercedes Customer Care will take that report and contact Upper Dealer Management for resolution - within 48 hrs you will not believe how nice your Dealer Service Dept will be when they call you to bring your G back in.
Your Dealer Service Dept - their Tech's don't get paid by Mercedes Warranty for diagnosis when you walk in - but UNDER Mercedes Customer Care Inquiry that changes for the Dealer - and that changes it more importantly for YOU !
