P1870 code

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May 19, 2022 | 09:52 PM

ltnate

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Joined: Aug 2003

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From: Louisville

P1870 code

Got this code. Transmission revved a little in between shifts. Is my newly built trans toast already? Is there anyway to know without tearing the transmission down? Thanks

May 20, 2022 | 02:46 PM

mmartinez

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From: Espanola New Mexico

Harsh 1-2 shift can set this code, I would clear it and hope it doesn't come back, worn valve body in transmission may be the problem, and I don't think there is anyway to diagnose without having to pull tranny.

May 20, 2022 | 06:35 PM

ltnate

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From: Louisville

Quote:

Originally Posted by mmartinez

Thank you...this is a freshly built motor and transmission. I also swapped in 3.42 gears and a 2800 Converter. I'm hoping it was just a tuning error.

May 21, 2022 | 04:33 PM

mmartinez

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From: Espanola New Mexico

You didn't mention the gear change in your initial post, that will most certainly cause that code, your tunner should be able to disable that code.

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