After buying our '02 P5 in January 2023, I wanted to do everything I could for it to stay road worthy. Figured I would do the automatic transmission oil drain and replace a few times. Once in January and once in August. The shop I went to didn't want to get into the pan to change out the filter. In September we started seeing the O/D light flashing at first start up in the morning and shift into Drive and the power is wayyy reduced. It would feel like a "soft" shift after a little buzzing when that happens. After a little bit it goes away. If I were to wait a bit and restart the car, eventually it would feel like a satisfying harder shift into D. So, I took some measurements with the FORSCAN tool, and it shows which solenoids are being engaged (pictures 1-4) ....
If I start out cold, SS1 is engaged fully but not SS2 or SS3, but at first it does try to turn them on.
Once it's warmed up, SS1 is slightly engaged for a hot second then SS2 and SS3 are fully on so that seems like the proper condition.
From what I can see from the Solenoid Apply Chart (PDF) that looks like SS2 and SS3 are Shift "D" and Shift "E" respectively.
I assume that means that SS1 = Shift "C" but the only time that's supposed to be engaged is when it's in 4th gear... the Over Drive gear maybe?
Can anyone confirm what's going on here? I'm going to replace out the Input Speed Sensor since it's accessible but other than that, I can only think of bringing it to a transmission shop for a diagnostic and maybe a new transmission filter. But since the solenoids are right there when you open the pan (picture), maybe it's a good time to replace those too.
Any insight would be insanely helpful.
Appreciate this forum!
Scott
If I start out cold, SS1 is engaged fully but not SS2 or SS3, but at first it does try to turn them on.
Once it's warmed up, SS1 is slightly engaged for a hot second then SS2 and SS3 are fully on so that seems like the proper condition.
From what I can see from the Solenoid Apply Chart (PDF) that looks like SS2 and SS3 are Shift "D" and Shift "E" respectively.
I assume that means that SS1 = Shift "C" but the only time that's supposed to be engaged is when it's in 4th gear... the Over Drive gear maybe?
Can anyone confirm what's going on here? I'm going to replace out the Input Speed Sensor since it's accessible but other than that, I can only think of bringing it to a transmission shop for a diagnostic and maybe a new transmission filter. But since the solenoids are right there when you open the pan (picture), maybe it's a good time to replace those too.
Any insight would be insanely helpful.
Appreciate this forum!
Scott
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