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Discussion Starter #1
Usually after the car has reached operating temp I am driving in sport manual powertrain mode 99% of the time.

When I do so, sometimes the transmission misses a shift. This happens every 100-300km or so, but sometimes in really awkward situations. For example I am in second gear, pull the paddle (with the same amount of force I do it every time, this is not the problem I'm sure), and the paddle clicks, but nothing happens, no shift takes place. This also often happens from 1-2 but I have also experienced it in higher gears. Mostly it happens in the mid to high RPM range. I haven't yet experienced that with downshifts also. Consequence is also sometimes that I hit the rev limiter although I have shifted quite some time before.

No transmission error code is stored.

After pulling the paddle a second or sometimes third time, the transmission shifts, and problem disappears for the next ??? kilometers. There is also no warning message or any other indicator of a problem.

I don't know if that also happens in other powertrain modes and in auto mode (latter is hard to test, because I of course don't always know if the auto wants to shift but the transmission doesn't ...)

Anyone has made similar experience?
 

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Terancshill. There is a software problem that, typically, delays downchanges 3 to 2 a sometimes 4 to 3 with the change being delayed and the throttle becoming 'dead'. This will be sorted with the forthcoming 2013 model year update.

However if you are missing changes, and the throttle remains responsive, your car may have a defective micro switch on the paddle. If the problem is always on up shifts or alway on downshifts then this Could indicate a switch problem. I am assuming to have both left and right paddle switches defective would not happen in Ron's World!

If the problem is on both up and down the box then it is likely a software or servo motor in the box that needs rectifying.

But I guess!
 

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do you know what software version you're running terence...
i think the first port of call is to try the different modes of the gearbox.. and see if that makes a difference

i had a different problem with mine.. spurious warnings although the shifts themselves were fine..

mclaren swapped the box out in the end.. i never had a failure of any sort, but the warnings were annoying.. interestingly for me the warnings didn't occur in track mode at all... so just had to drive at max attack all the time.
 

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As mikey says,you need to know what platform you are on ?? 8.3 is good in manual,9 is good in auto but bad in manual !! and platfrom 10 will cure all these problems hopefully!
 

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Discussion Starter #5
Downshift: I also experience the downshift problem with huge lag, but I already heard that it will be fixed and so am not so worried about it; further I can easily avoid that by stepping hard on gas just *before* shifting.
My problem seems to be another manual; I would also suspect a problem with the microswitch, but is it common for a switch to fail in a way that it doesn't work every >100 actuation?

Platform/software version: Don't have the manual here, any way to check that version in-car or do I need to drive to the dealer?
 

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TerenceHill. I would suggest you forget 'common' as your car is unique and the issue is cause, I know that is obvious but we can only speculate as to the possible causes.There is a trap, with respect, in searching for 'common' in a low volume car.

Micros-witches can be pesky buggers or total saints.

Gearbox control panels can throw a wobbly.....I had a Merc box fail in week two and it eventually mashed itself into bits and pieces within days.

Solenoids and actuators, which must be present in the box can go their own way.

So I would say record the incidents, let the dealer plug in his HAL 9000 to see if the error code supports your experience ( He may have a Cray 9000 ). Failing that let them drive the car for a few days.

What you are experiencing is unacceptable and I'm sure the guys at MPC would agree and support an investigation.

Trying to be constructive, even though I have just purchased a Bluetooth Mouse from Amazon and the micro-switch works intermittently........ahhhhhhhhhhhh
 

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I had this it is the sensors on the steering wheel a mate had the same and both our cars were April delivery . Qui k fix at dealer
 

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Usually after the car has reached operating temp I am driving in sport manual powertrain mode 99% of the time.

When I do so, sometimes the transmission misses a shift. This happens every 100-300km or so, but sometimes in really awkward situations. For example I am in second gear, pull the paddle (with the same amount of force I do it every time, this is not the problem I'm sure), and the paddle clicks, but nothing happens, no shift takes place. This also often happens from 1-2 but I have also experienced it in higher gears. Mostly it happens in the mid to high RPM range. I haven't yet experienced that with downshifts also. Consequence is also sometimes that I hit the rev limiter although I have shifted quite some time before.

No transmission error code is stored.

After pulling the paddle a second or sometimes third time, the transmission shifts, and problem disappears for the next ??? kilometers. There is also no warning message or any other indicator of a problem.

I don't know if that also happens in other powertrain modes and in auto mode (latter is hard to test, because I of course don't always know if the auto wants to shift but the transmission doesn't ...)

Anyone has made similar experience?

Hello Guys

I have the exact same problem with my car and wondered if you ever got to the bottom of this? Mine is a 2014 by the way so should have all the right software.

McLaren looked at it and decided to change the gearbox but when flat out in 2nd and upshiffting into 3rd it skips it and goes into 4th.

Could it just be the paddle switches as mentioned?
 

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Hello Guys

I have the exact same problem with my car and wondered if you ever got to the bottom of this? Mine is a 2014 by the way so should have all the right software.

McLaren looked at it and decided to change the gearbox but when flat out in 2nd and upshiffting into 3rd it skips it and goes into 4th.

Could it just be the paddle switches as mentioned?
Given that it only happens from 2nd to 3rd I don't really see how it could be the physical switch. The switches themselves have no concept of what gear you are in. It really does sound like a software issue especially given that they have already swapped the gearbox. I would also say perhaps a sensor problem, but again not sure what sensor outside of the gearbox could only effect 2-3rd shifts.
 

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Thinking about this some more I guess there is one scenario that could point at the switch. If the switch was faulty such that under certain conditions it was sending multiple pulses even though the switch is only pressed once. Perhaps in second at high revs those "conditions" are met, with perhaps vibrations, speed, battery voltage etc. That is a long shot, but I've seen stranger things while diagnosing strange behaviour with electronics and software.

Questions for McLaren:
In a car that is working without this issue, would a very quick double tap of the shifter cause the same result?
Can they log the canbus while performing that shift? Examining the logs would show if the car is receiving multiple shift commands or whether it is doing it for other reasons
 
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