Toyota Corolla 2012 ZRE152 4 speed automatic issue

[Gary.y]

Hi Toyota owners,

I'm new to this forum registration.

I need some advice or help as I have a

shifting issue with my 2012 4 speed automatic

transmission.

It doesn't do it all the time but the gears don't shift smoothly specially 3 to 4 gear it just bangs in when I'm cruising and it happens more often when hot.

Got full transmission serviced with Toyota genuine parts no metal shavings in pan.

Changed ATF 3 times.

Full major service done, 100000 KLM on car. Full synthetic oil with 98 Ron fuel.

Throttle body cleaned twice.

Maf sensor cleaned.

New spark plugs.

No engine codes.

Great loss of power sometimes specially on hot days.

Please help as no mechanic knows what the issue is.

 

Thanks in advance.

 

Edited May 1 by Gary.y

[ozieagle]

Hi Gary,

 

I would suspect a clutch problem, like not fully disengaging. Maybe you aren't fully pushing it to the floor, or the system needs topping up or bleeding or both.

 

Herb

[Gary.y]

3 hours ago, ozieagle said:

Hi Gary,

 

I would suspect a clutch problem, like not fully disengaging. Maybe you aren't fully pushing it to the floor, or the system needs topping up or bleeding or both.

 

Herb

Thanks for your reply, it's an automatic 4 speed. 

[ozieagle]

OHH! I missed that.

 

Herb

Edited April 25 by ozieagle

[Gary.y]

No all good herb I know your trying to help, I should have been more clear, I have updated my wording.

Thanks alot 

[Leedogg]

Hi mate, did you solve the issue?