Shift solenoid??

Shift solenoid??

Postby Mberry0614 [OP] » January 9th 2020, 9:05am

My SAFARI has 160k, and no known trans problems until now. It started with losing reverse. I parked on a steep hill and went to back out, but nothing. So I had someone pull me out, and i still had all gears, or so I thought. But to shift out of first, you have to let your foot off the gas. I drove it for another hundred miles or so, and now it's throwing a check engine light for the 1-2 shift solenoid. Could that all be linked to the shift solenoid, or maybe even just dirty fluid or filter? Somebody suggested maybe a dirty line? I was really hoping I wouldn't have to R&R it. The vans an 01 with 160k. 4l60e - 2wd. I just bought it so I don't know if the fluid has ever been changed. Any input is greatly appreciated. Thanks
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Re: Shift solenoid??

Postby h.gil » January 9th 2020, 10:13am

Drop the pan, solenoid is right there. 1 hour job.
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Re: Shift solenoid??

Postby Old Barney » January 9th 2020, 2:47pm

I would check the electrical plug that plugs in the top of the transmission. And the wiring as that is a good spot for an animal to hide from the elements. Then chew through the wire. I had a friend who I helped diagnose his identical problem.
We went to JY and cut wiring as far as we could with plug and spliced in eliminating the chewed area.
Squirrels love the taste of the wiring General motors uses. another place to look is around the battery the wiring there seems to be another tasty place under battery shelf around computer. When a code is sent from the computer like yours it senses an open or short in the circuit. Either the solenoid or wiring
Changing the fluid and filter won't hurt either. While pan is off
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Re: Shift solenoid??

Postby markmitch » January 9th 2020, 4:53pm

GM recommends never flush there transmissions due to stuff that is stuck inside gets jarred lose and causes more problems so filter change and clean out the pan along with what the others said.
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Re: Shift solenoid??

Postby Astro Pop » January 9th 2020, 7:29pm

^^^^^ What Mark said. Changing flluid on a trans that already has problems usually makes it worse. Don't drop the pan until you're sure you want to stay with it until it's fixed.
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Re: Shift solenoid??

Postby AstroWill » January 9th 2020, 9:00pm

It's common to lose reverse with a damaged sunshell.

What is the actual code(s) that you pulled?

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Re: Shift solenoid??

Postby Mberry0614 [OP] » January 10th 2020, 8:32am

Code is p0752 - shift solenoid A stuck on (1-2 solenoid). But I didn't think a bad solenoid would cause it to lose reverse?? I was thinking sunshell also. Thank you all for your help.
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Re: Shift solenoid??

Postby Old Barney » January 10th 2020, 6:57pm

I think if it senses forward (1/2) it won't go into reverse because computer thinks your still trying to go that away to the front.
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Re: Shift solenoid??

Postby h.gil » January 10th 2020, 7:26pm

Mberry0614 wrote:Code is p0752 - shift solenoid A stuck on (1-2 solenoid). But I didn't think a bad solenoid would cause it to lose reverse?? I was thinking sunshell also. Thank you all for your help.


That happened to me. I had a 95 Camaro way back when.. couldn't even pull out of the driveway. Got it scanned, and bought the solenoid from the dealer; they also gave me a diagram of the location.

Get a nice wide shallow pan (like those storage containers that roll under the bed) and put it under the tranny when you crack it open (I let it drain over night). Swap the solenoid. Clean the pan, clean the magnet, replace the seal. Button it up. Full it up. Gtg.
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Re: Shift solenoid??

Postby AstroWill » January 11th 2020, 2:17am

How is your fluid level?

Next would be to drop the pan and take a look. If it were mine I would plan on doing filter/fluid while in there.

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Re: Shift solenoid??

Postby Mberry0614 [OP] » January 14th 2020, 11:02am

AstroWill wrote:How is your fluid level?

Next would be to drop the pan and take a look. If it were mine I would plan on doing filter/fluid while in there.

Fluid level is good. Still looks clean also.
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