Question about 2004 Chevrolet Aveo

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2004 aveo auto trans. will not shift into 4th gear after an eng. change

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Sometime s its kind of hard to tell for sure with and automatic if it has shifted into high gear .You say new engine installed check the linkages and all shift related parts if it shifted before and nothing was changed it should shift now
Also take a look at the interlock switch on the side of the transmission it is derectly linked to to the shift lever on the coloum

Posted on Mar 30, 2015

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Posted on Jan 02, 2017

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I Have a 2007 Suzuki Forenza with a winding in the Transmission the code PO783


get it fixed, are you going to diagnose and repair and A/T?
that car is a 1/2 GM/ Daewoo car. a sad mix of parts. (sell it? i would )
the service book is here. $4
This is called an FSM.
https://suzukipitstopplus.com/Products/1068-2007-forenza-reno-service-manual.aspx

783 (p07xx means tranny issues)

quote FSM:
Trouble Code: P0783 (2.0L L4 VIN - Auto)
3 - 4 Shift Malfunction Print this code dataprint_icon_codes.gif comments in (xxxx)
Trouble Code Conditions: (preconditions before test)
Transaxle oil temperature is greater than -10 °C (14 °F). Selector lever is not N (Neutral), P (Park) position. (warm , in gear)
System voltage is greater than 9 V.(car battery not dead)
No input speed error DTCs P0715, P0716 and P0717.
Speed sensors not dead.
Output speed is greater than 256 rpm. (tail shaft rpm (speed)
Input speed is greater than 400 rpm. (engine rpm after clutch)
3 - 4 gear shift is active. (the TCM commands shifts to 4th)
Possible Causes:
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  • ECM, bad.
  • TCM bad or inputs wrong.
  • end quote.
Comments:
this means, in pure physics.:
the transmission slip's
what that test failure means it bar stool talk is this.
I shafted to 4th but the MPH is too slow, so the transmission
is not shifting to 4th , or it slips

any mech would drive the car first. (did he?)
and flog it up hills (in Kansas? omg)
TO SEE, if it slips in 4th or fails to shift at all.

  1. fresh ATF? and filter? serviced and levels good on A/T
  2. is the 4th gear command to the shift solenoid good.?(logic)
  3. if trans slips? (fails FSM book stall tests) bad tranny.
  4. if the trans fails stall , check line pressure per FSM.
like that, and more, lots to say on A/T
If in uSA find a real , shop, with ASE techs. and win.

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Not shifting gear


Time for a rebuild !!

Change your trans fluid every 3 years
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Have the system diagnosed first, before
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2004 Chev Aveo not shifting into 4th gear


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