Smart 451 5th gear 70 mph

3481 Views 13 Replies 10 Participants Last post by sedwiiik, Jan 24, 2022

H140987

Discussion Starter · Jul 4, 2019 (Edited)

Hi,

I recently purchased a smart 451 late 2008
Actuator has been changed 6000 miles ago and just had a new clutch fitted but I still have the same issue, the car can’t go over 70mph in 5th gear but can in 4th. You can accelerating Past 70mph in 5th but it will only Rev then past the 70 Mark. If you keep the accelerator down the car changes down to 4th gear and 5th disappears until car is turned off.
I have code scanned after a motorway run and have two codes<img src="http://smartcarofamerica.com/forums/images/smilies/tongue.gif" border="0" alt="" title="Stick Out Tongue" class="inlineimg" />1905 p1800

Thanks

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1 - 14 of 14 Posts

dhlairbusb4

· #2 · Jul 4, 2019

Wow, this is a strange one. Almost sounds like you have a speed governor installed. I don't think its the clutch slipping, because it would probably do that in 4th also.
Sounds electronic to me, maybe the ESP system.
I looked but could not find the codes you listed on the evolution site.... might have to go to a dealer, or find someone with a MBstar reader.
Best of luck, keep us informed.

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jimvw57

· #3 · Jul 4, 2019

I would try a reset, maybe disconnect the battery for an hour and try it again. The generic OBDII code have those numbers but it does say they are brand specific so their descriptions may not be correct. Maybe as a starting point, clean all the ground connections you can find, and check for water inside a connector (??) strange codes!

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toaster

· #4 · Jul 4, 2019

H140987 said:
Hi,

I recently purchased a smart 451 late 2008
Actuator has been changed 6000 miles ago and just had a new clutch fitted but I still have the same issue, the car can’t go over 70mph in 5th gear but can in 4th. You can accelerating Past 70mph in 5th but it will only Rev then past the 70 Mark. If you keep the accelerator down the car changes down to 4th gear and 5th disappears until car is turned off.

Possibly the engine is down on power and needs the higher revs of 4th gear to surpass 70mph. Dirty air filter?

~toaster

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H140987

Discussion Starter · #5 · Jul 4, 2019

Car has had a recent service with all oils and filters changed. Thinking to pull out the esp fuse and try.

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jwight

· #6 · Jul 4, 2019

"new clutch fitted" might be the issue. If there are no OBD codes then there's no reason the car shouldn't reach 90 mph in 5th gear. Possible clutch slipping?

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H140987

Discussion Starter · #7 · Jul 4, 2019

jwight said:
"new clutch fitted" might be the issue. If there are no OBD codes then there's no reason the car shouldn't reach 90 mph in 5th gear. Possible clutch slipping?

New clutch was fitted as I thought thats what the issue was ??*♂ But still doing the same thing just checking gearbox number to see if somebody has put the wrong gearbox in.

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twcom

· #8 · Oct 29, 2019

How is this issue working out. I am interested in the clutch work that was done.

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1983JZR3W

· #9 · Oct 30, 2019

twcom said:
How is this issue working out. I am interested in the clutch work that was done.

This guy has not been back either.

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sedwiiik

· #10 · Jul 18, 2021

Hello I have the same problem on my smart... I am French and I did not find any information on the problem ... I changed the actuator following a diagnosis in smart center it did not change anything

SRY Google translate 😅😅😅😅😅

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Reactions: 1

sedwiiik

· #11 · Jul 19, 2021 (Edited)

Error code C1323 P1905 P1800

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maarv726

· #12 · Jan 21, 2022

Hello guys,

same problem with my smart 451.Changed the clutch and the whole gearbox. Anything new for this problem?

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vadsoom

· #13 · Jan 22, 2022

I can think of two scenarios…

When changing the clutch, there is a Xentry procedure for learning the clutch drag position. I wonder if this wasn’t done.

The accelerator pedal in the smart is not mechanically connected to the drivetrain - it’s all electrical. If the pedal and/or lockdown switch have developed issues, it might effect the shift points.

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sedwiiik

· #14 · Jan 24, 2022

for me the problem was that the gearbox was not good ... i had 61hp gearbox on 84hp ... sry for my english =P

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