Gear problem - Electrical or mechanical

[eitankon]

Hi all,
I own a 2002 XC70 , with a 220,000 km on it.
Gear has started to shift abnormally.

First thing I noticed , is when the gear is hot , it takes about 1.5 seconds until it shifts from parking to drive or from reverse to drive.

Second : When driving a hilly road at about 60-80kmph , especially when incline is moderate gear shifts from 4th to 3rd but before that it tries to go to 2nd and that causes a strong "bump" that shakes the car , and then all get to normal.
When driving not on a hilly road, it never happened.

I have noticed that usually , it happens when acceleration pedal is pressed without a change , and then the road start to be hilly. And when I add gas , it's like the engine rpm doesn't increases.

Volvo dealer , didn't find any errors on the cars computer with regards to gear functionality or else.

I thought maybe it has anything to do with the Throttle positioning sensor ? or maybe another sensor ? Maybe gas pump.

Appreciate your kind advice.

Tnx,

Eitan

[JRL]

Read the transmission threads.
You will probably need a tranny soon but there are a few things to try first which may save it
Again, please read the transmissions threads

[billr99]

Hi all,
I own a 2002 XC70 , with a 220,000 km on it.
Gear has started to shift abnormally.

First thing I noticed , is when the gear is hot , it takes about 1.5 seconds until it shifts from parking to drive or from reverse to drive.

Second : When driving a hilly road at about 60-80kmph , especially when incline is moderate gear shifts from 4th to 3rd but before that it tries to go to 2nd and that causes a strong "bump" that shakes the car , and then all get to normal.
When driving not on a hilly road, it never happened.

I have noticed that usually , it happens when acceleration pedal is pressed without a change , and then the road start to be hilly. And when I add gas , it's like the engine rpm doesn't increases.

Volvo dealer , didn't find any errors on the cars computer with regards to gear functionality or else.

I thought maybe it has anything to do with the Throttle positioning sensor ? or maybe another sensor ? Maybe gas pump.

Appreciate your kind advice.

Tnx,

Eitan

My '02 has about 230K kms on it and it was acting pretty much the way you describe yours. Since I cleared all the accumulated DTCs, as well as the tranny adaptives, and performed the adaptation process, my gearbox is performing much,much better. I know you said your dealer checked but are you confident of the quality of their work? I have my own DiCE and did the clearing and adaptation myself and can only speak to the results from that.

Good luck,

Bill

[eitankon]

Thank you very much for the replies and suggestions.

Sir , can you assist with more detailed information with regards to "Since I cleared all the accumulated DTCs, as well as the tranny adaptives, and performed the adaptation process" ?
I probably do not understand the meaning of this actions/procedures.

I am ready to do what ever is needed to save the tranny.

Also , I did changed the oil a 15k ago , but didn't flush it. I have a friend that works in a Mazda repair shop , and he said they are using a special machine to flush and drain the tranny entirely , and it proves it self.

Appreciate your kind assistance.

Eitan