Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
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Old Oct 26, 2009 | 10:25 PM
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Ok so normal driving in D or OD i have all gears, then tonight i felt like taking it a little higher in the RPMs so i dropped it in 1st at a stop light when i took off it was in 2nd. Its never done that before so i get home turn the car off then turn it on and put in 1st and it works...so then i go around the block and it still works. come up to my stop sign and then i put it in 1st take off and its in 2nd again, but in D or OD it holds first just fine...WTF??
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Old Nov 5, 2009 | 11:23 AM
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Originally Posted by cammed00z
Ok so normal driving in D or OD i have all gears, then tonight i felt like taking it a little higher in the RPMs so i dropped it in 1st at a stop light when i took off it was in 2nd. Its never done that before so i get home turn the car off then turn it on and put in 1st and it works...so then i go around the block and it still works. come up to my stop sign and then i put it in 1st take off and its in 2nd again, but in D or OD it holds first just fine...WTF??

I have the same problem, did you fix it ?

https://ls1tech.com/forums/automatic...ans-issue.html
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Old Nov 5, 2009 | 11:32 AM
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You are setting limp mode, You will need to scan for codes to determine why.
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Old Nov 5, 2009 | 02:39 PM
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scan for codes and you will get a po756 number or so then you will have to buy a shift solenoid if thats what it is but it can be something else....but post up codes first.
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Old Nov 5, 2009 | 06:19 PM
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No havent fixed it....i can get in and put it in first and it will stay, whenever i shift out say make a pass then slow down and go to put it in first again it will start in 2nd...but if i go ahead just move it to D or OD first engages just fine...dont have to turn it off for it to grab first....I do have to turn it off to manually hold first tho...ill scan for codes tho.
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