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.

Jun 3, 2026 | 08:15 PM

Beast

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Joined: Jul 2004

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From: Pingree Grove IL

Whoops, old thread.

Last edited by Beast; Jun 3, 2026 at 08:17 PM.

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