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tnoftsger
New User
Sep 29, 2016, 1:36 PM
Post #1 of 4
(1744 views)
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4L60E Shift problems
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Hi all,
New guy here, and I have a 2000 1/2 ton 4WD suburban with a 4L60E transmission that is giving me fits. It started by downshifting out of OD at almost any throttle input, everything else worked fine. Checked the TPS, it is fine. Finally threw a P0751 code, stuck "A" solenoid.
Bought a master solenoid kit, both A & B, TCC, 2-3 solenoid, PWM, EPC force meter, wiring, all of it and installed it. Put a new filter and gasket while the pan was off.
Now it holds 1st gear way past the normal shifting point, and won't shift until you lift off the throttle and then bumps second on it way to 3rd. As you slow down for a turn, it down shift into second as it should but it slips and immediately downshifts again to 1st.
Post solenoid replacement show that the "A" and "B" solenoids were not bad to begin with and it will still throw the P0751 code daily.
Any chance that the solenoid was never bad, but rather the 1-2 shift valve is hung or obstructed? The odd won't stay in overdrive is gone, but now this. I'm trying to make sure I don't have a valve body problem before I junk the tranny all together.
Thanks in advance.
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gsferraro
Veteran
Sep 29, 2016, 2:03 PM
Post #2 of 4
(1736 views)
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Re: 4L60E Shift problems
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Hello,
This may be making a 1-3 shift, after the shift pull the shifter down to manual 2nd and see if it holds or if it seems like its in neutral. Gary
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tnoftsger
New User
Sep 29, 2016, 3:18 PM
Post #3 of 4
(1728 views)
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Re: 4L60E Shift problems
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No, after the upshift from 1 to third if you pull the selector back down to 2nd, it revs like it is in neutral.
I also tried taking off from a stop in selector position 2nd. It accelerates thru first, holding too long, and when the shift happens, again like it is in neutral.
(This post was edited by tnoftsger on Sep 29, 2016, 3:20 PM)
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gsferraro
Veteran
Sep 29, 2016, 4:32 PM
Post #4 of 4
(1723 views)
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Re: 4L60E Shift problems
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Hello,
Ok, if it revs like its in neutral then your band is no good. The band works 2nd and 4th gear. On these 4L60E transmissions, when you pull the selector in manual 2nd, it takes off in 2nd and stays there(it takes off on the band). The only thing you can do on the outside is pull the servo out which is located on the right side, other than that the trans would have to come out for repair. Gary
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