P1810 Code Hard to Find the Problem
Thread Starter
Staging Lane
Joined: Nov 2023
Posts: 85
Likes: 9
The only problem is that these cars didn't have this condition when they were new and stock off the assembly line, so something has changed (internal wear, or something such as this) over the years to cause the issue (unless there is some modification that's been done which led to this side-effect). Hopefully your tuning changes continue to compensate for whatever the problem is, but there had to be something worn/out-of-spec which caused this in the first place.
As you can see, the apply and release parameters for 4th gears are too close. This is what was on the car before I changed them to:
I am curious to know what the numbers are on your 1998 stock program.
Registered User
Joined: Jul 2024
Posts: 6
Likes: 0
i would try just adding a gauge to pressure side of fluid line and monitor your pressure that way it might be old school but i dont know of a scanner under 6000$ dollars that would monitor pressures on manifold switch. There might br im out of touch bit chesper way is to do the gauge at or around 115 psi
Teching In
Joined: Oct 2025
Posts: 12
Likes: 0
Did this also solve the p1810 issue? My tahoe is having similar issues - including the key/power cycling to return it to normal operation. Mine would get stuck in first only, no upshift to 2nd. I had it rebuilt, replaced PCM, put in a new valve body with new MPS, and now when triggered will not shift past 2nd - i am able to trigger it by downshifting manually into 1st rolling into a light or stop sign. But if i stop and key cycle it returns to normal all gears. IDK what to even replace at this point. The only component i havent replaced is the internal harness with lockup TCC solenoid under the VB, but the key cycle solution seems odd to me if a component was failed.