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09-06-2022, 09:53 AM
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#1 |
 Drives: 2012 Yaris Hatchback 3 door Join Date: Jan 2022
Location: South Jersey, USA
Posts: 16
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Erratic shifting from 3rd to 4th
Son's car. 2012 Yaris hatchback automatic with just over 60k miles. The car ran silky smooth until now... No CEL, no stored error codes.
This happens after engine warms up to operating temperature. When driving at 20-40 mph, at a steady speed, without accelerating, the transmission starts shifting randomly from 3rd to 4th. Appears randomly fluctuating between 3rd and 4th. Often it shifts to 4th prematurely, so there is a sensation of power loss as the RPM is still too low for 4th gear. The car runs just fine at highway speeds and shifts through gears just fine when accelerating hard. He took the car to Toyota dealer who said it appears transmission issue, but could not give more specific answer (even though he paid $150 for "diagnosis"). Your input is highly appreciated. I suspect on of the solenoid valves, just not sure which one. Perhaps best solution would be just to replace entire valve body? |
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09-06-2022, 10:42 AM
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#2 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Car was in some sort of accident recently, right?
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Synthetic Oil: Its All In Your Head |
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09-06-2022, 11:05 AM
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#3 |
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Drives: 2012 Yaris Hatchback 3 door Join Date: Jan 2022
Location: South Jersey, USA
Posts: 16
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No, that was a different car. This one was never in an accident.
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09-06-2022, 12:13 PM
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#4 |
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Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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What is the condition of the transmission oil? Is it clear red or is it black/dark brown?
I would consider dropping the automatic transmission oil pan and examining it for cleanliness IE Metal shavings and other unpleasant things.
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Synthetic Oil: Its All In Your Head |
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09-06-2022, 12:49 PM
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#5 |
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Drives: 2012 Yaris Hatchback 3 door Join Date: Jan 2022
Location: South Jersey, USA
Posts: 16
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It looks more red than brown. There was some super fine black power accumulation on magnets on fluid pan.
https://imgur.com/a/DGvbYu0 |
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09-06-2022, 12:49 PM
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#6 |
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Drives: 2012 Yaris Hatchback 3 door Join Date: Jan 2022
Location: South Jersey, USA
Posts: 16
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Last edited by k98shooter; 09-06-2022 at 12:52 PM. Reason: Repost |
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09-06-2022, 01:14 PM
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#7 |
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Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Sounds pretty normal and there’s not many miles on the car. Nothing catastrophic anyway.
You’re you could always go to AAMCO and have them give an opinion.
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Synthetic Oil: Its All In Your Head |
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09-06-2022, 02:46 PM
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#8 |
 Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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its the year of the trransmission failures
buddys honda gave up, bought a used car..its didnt make it home...trans...wnet hunting for other rigs that he would be happy with....adds full of the right rigs all with trans issues...widened the search..TONS of trans issues yours sounds more like a electrical issue than a mechanical one tho |
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09-07-2022, 05:01 PM
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#9 |
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Drives: 2015 yaris le Join Date: Feb 2015
Location: hamilton, on
Posts: 149
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Try using some Lucas. It might help.
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09-17-2022, 03:58 PM
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#10 |
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Drives: 2012 Yaris Hatchback 3 door Join Date: Jan 2022
Location: South Jersey, USA
Posts: 16
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Replacement valve body fixed the problem. I don't know which solenoid was faulty, as the replacement VB came with solenoids.
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09-17-2022, 05:10 PM
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#11 |
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Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Good work. Interesting there was no code thrown
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