TRNW-2: 4L60E with SSB code

[J V]

 couple months ago had similar situation in a 97.....pcm fixed it


On Fri, Oct 3, 2025 at 12:22 PM Wayne via trnw2 <trnw2 at trnw.net> wrote:

> I went thru this a few weeks ago on a 4l80, customer said a pcm fixed it.
> Wayne Garrick
>
> On Oct 3, 2025, at 12:12 PM, Mark Puccinelli via trnw2 <trnw2 at trnw.net>
> wrote:
>
> 
> 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>*
>>
>>
>>
>> Visit me on Facebook:
>> https://www.facebook.com/mark.puccinelli.7
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>> Best Regards,
>> Tod Chretien
>> TRNW Inc.https://www.trnw.net
>>
>> This message was sent from the TRNW Technical Discussion Forum (trnw2).
>> You were sent this message because you have subscribed to our mailing list.
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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:
> https://www.facebook.com/mark.puccinelli.7
>
>
>
>
>
>
>
>
> This message was sent from the TRNW Technical Discussion Forum (trnw2).
> You were sent this message because you have subscribed to our mailing list.
> If you don't want to receive these emails from TRNW in the future, please
> unsubscribe here:
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> TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355
>
> This message was sent from the TRNW Technical Discussion Forum (trnw2).
> You were sent this message because you have subscribed to our mailing list.
> If you don't want to receive these emails from TRNW in the future, please
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> TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355
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