TRNW-2: 4L60E with SSB code

[Tod Chretien]

[ /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/
>
>
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> /Skyline College/
> /San Bruno,CA/
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>
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-- 
Best Regards,
Tod Chretien
TRNW Inc.
https://www.trnw.net
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