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I have a problem with my 8-speed auto transmission that only occurs when towing my single axle Elddis caravan, max permissible weight 1500kg. Without the caravan the car is great, with the caravan it changes up through the gears until it gets to 4th but then hangs in 4th gear until the revs get to 3200rpm or more before it’ll change up to 5th This equates to more than 60mph so not ideal when towing! Luckily I can override the auto box with the + flappy paddle, and when I do so at about 2200rpm in 4th the dash display comes up with 6 in green with an up arrow indicating that the car thinks it should be in 6th gear. Once there it seems quite happy to cruise along at just under 2000rpm on the flat at just over 50mph, and similar revs in 7th on dual carriageways at 60mph. Without the van on the back and driven gently it generally settles around 1600rpm in each gear on the flat, so I’d expect more revs with the van on the back, but not the reluctance to change up out of 4th and sometimes 3rd too. The car changes down perfectly with the van on the back, its only up chages that are affected.
The towbar fitter used a Right Connections electrics kit, and I also had this make of kit on my previous car; a Ford Kuga Mk2 2.0 TDCi with the Powershift gearbox and AWD with no gear changing issues at all. Right Connections say that their box of tricks doesn’t write anything to the car’s systems, and there are no software alterations to the car after fitment, unlike the Kuga where some re-programming is required, so I can’t really see that being the problem. The car has been back to my local Kia main dealer who can find nothing wrong with all software correct and up to date, and Kia technical claim that they have never seen this before. If I plug in my towbar mounted bike rack the car drives normally. Anyone else tow with one of these and had issues??
 

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Have not got this motor but have been looking at the new 48v Sorento and Santa fe. . The reason I am sticking with my present car 6 gear auto is solely as you have now confirmed my suspicions of what would be the result of the 8 speed box. I tow a 1500kg caravan as well. Putting your cycle on is making no difference but hanging 1500kg on the back I would not expect it to go up all gears unless downhill.
 

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I have a problem with my 8-speed auto transmission that only occurs when towing my single axle Elddis caravan, max permissible weight 1500kg. Without the caravan the car is great, with the caravan it changes up through the gears until it gets to 4th but then hangs in 4th gear until the revs get to 3200rpm or more before it’ll change up to 5th This equates to more than 60mph so not ideal when towing! Luckily I can override the auto box with the + flappy paddle, and when I do so at about 2200rpm in 4th the dash display comes up with 6 in green with an up arrow indicating that the car thinks it should be in 6th gear. Once there it seems quite happy to cruise along at just under 2000rpm on the flat at just over 50mph, and similar revs in 7th on dual carriageways at 60mph. Without the van on the back and driven gently it generally settles around 1600rpm in each gear on the flat, so I’d expect more revs with the van on the back, but not the reluctance to change up out of 4th and sometimes 3rd too. The car changes down perfectly with the van on the back, its only up chages that are affected.
The towbar fitter used a Right Connections electrics kit, and I also had this make of kit on my previous car; a Ford Kuga Mk2 2.0 TDCi with the Powershift gearbox and AWD with no gear changing issues at all. Right Connections say that their box of tricks doesn’t write anything to the car’s systems, and there are no software alterations to the car after fitment, unlike the Kuga where some re-programming is required, so I can’t really see that being the problem. The car has been back to my local Kia main dealer who can find nothing wrong with all software correct and up to date, and Kia technical claim that they have never seen this before. If I plug in my towbar mounted bike rack the car drives normally. Anyone else tow with one of these and had issues??
Similar gearbox behaviour for me. We tow a Elegance and are about 95% ratio. Mainly happens going uphill and I use the paddle to change up. Also notice it takes a while for the car to recognise the extra weight when first towing so need to paddle up to 8 for the start of the journey.
Must admit I don’t find it a problem and assumed it was just the extra weight
 

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Discussion Starter #4
Thanks for getting back to me. That's interesting our does it all the time even on the flat or slight downhill. Once we get it up out of 4th its quite happy unless you slow to the extent that it drops to 4th or 3rd again. Maybe yours has an older version of the software that actually works better!
 

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Discussion Starter #5
Also, when towing the car will never stay in 8th gear, 7th is as high as it'll go. which is no problem anyway at 50 -60mph.
 
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