TRNW-2: 4L60E with SSB code

[Mark Puccinelli]

Anytime Tod.

On Fri, Oct 3, 2025 at 8:56 AM Tod Chretien via trnw2 <trnw2 at trnw.net>
wrote:

> [ *If the voltage is stair stepping slowly that usually means the module
> is bad*.]
>
> The key word is 'USUALLY'. LOL
>
> Thanks for the reply Mark.
>
> Tod
>
>
> On 10/3/2025 8:22 AM, Mark Puccinelli wrote:
>
> If the voltage is stair stepping slowly that usually means the module is
> bad.
>
> On Fri, Oct 3, 2025 at 8:19 AM Tod Chretien via trnw2 <trnw2 at trnw.net>
> wrote:
>
>> Group,
>>
>> I have this 1999 Silverado with a P0758 SSB circuit code.
>>
>> The solenoid resistance is 21 ohms.
>>
>> With my scope hooked to the SSA and SSB control wires along with a
>> battery ground, both solenoids have .4 volts when commanded on, which
>> seems a bit high. Like the ground the PCM is providing isn't good enough.
>>
>> When the solenoids are off I have battery voltage flowing through them,
>> which eliminates the ignition switch.
>>
>> The code actually sets on the 2-3 shift which is delayed. While
>> monitoring the shift solenoid control circuit on a scope, SSB voltage on
>> the 2-3 shift goes from .4 volts to battery voltage really slow. Usually
>> the change from on to off is instantaneous. I have never seen one
>> release the ground so slowly. The transmission eventually makes the 2-3
>> shift when the SSB voltage finally reaches battery voltage, but the
>> P0758 code sets and then it has 3rd gear starts. Until you cycle the key
>> which starts the whole process over again.
>>
>> As anyone seen anything like this? Am I correct to assume it's the PCM?
>>
>>
>> --
>> Best Regards,
>> Tod Chretien
>> TRNW Inc.
>> https://www.trnw.net
>>
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>>
>
>
> --
> *Mark Puccinelli*
> *Product Support Technician*
> *TransGo*
> *mark.puccinelli at transgo.com <mark.puccinelli at transgo.com>*
>
>
> *Adjunct Driveline Professor*
> *Skyline College*
> *San Bruno,CA*
> *puccinellim at smcc <puccinellim at smccd.edu>d.edu <http://d.edu>*
>
>
>
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>
>
>
>
>
>
>
> --
> Best Regards,
> Tod Chretien
> TRNW Inc.https://www.trnw.net
>
> This message was sent from the TRNW Technical Discussion Forum (trnw2).
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> TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355



-- 
*Mark Puccinelli*
*Product Support Technician*
*TransGo*
*mark.puccinelli at transgo.com <mark.puccinelli at transgo.com>*


*Adjunct Driveline Professor*
*Skyline College*
*San Bruno,CA*
*puccinellim at smcc <puccinellim at smccd.edu>d.edu <http://d.edu>*



Visit me on Facebook:
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