1998 Chevy Tahoe codes p1870.
Checked the code. Transmission slipping. Checked fluid, full, and clean (red)I believe the fluid psi solenoid is bad.
Question = normally the vehicle runs fine..Then when put under a load or driven hard (highway), the light comes on and the trans shifts funny. When the trans acts up, the 1-2 shift is very harsh, and a burning smell is present.

Upon sitting parked for around 1 hour, the trans is fine until you apply torque to it again.I will be changing the filter tomorrow, but would like your opinion.

Answer:
P1870-component slipping, can be caused by a problem in the valve body, but with that many miles on it, it may just be time to overhaul because of slipping components, The condition of the fluid-if burnt, means trans. Needs to come apart and look for a failure. Again, with that many miles, probably just worn out. Try the filter and fluid change to see if it helps. The hard shifts are most likely caused by the line pressure being raised to compensate for a slipping component.
2001 OLDS AURORA P1811.
TRANSMISSION REBUILT. NEW SOLENOID BOOST KIT PUT IN TRANNY LOTS OF INVESTIGATING.
Question: MY AURORA IS SHIFTING HARD, IN EVERY GEAR. IT DOESN'T DO IT ALL THE TIME OR EVERY DAY BUT DOES SEEM TO DO IT AFTER YOU SIT FOR A WHILE OR DRIVE FOR A WHILE!! SOMEONE SAID MY MANIFOLD GASKET COULD BE LEAKING CAUSING IT TO DO THIS!!

PLEASE TELL ME WHAT YOU THINK MY CAR HAS BEEN LOOKED AT FOR A MONTH NOW AND THE MECHANIC CAN'T FIGURE IT OUT! PLEASE HELP ME.

answer:
Hello and welcome. First i would need to know if the transmission was rebuilt to repair this code, or was rebuilt for another reason- and now the code and shifting hard are occurring. I will wait for your reply.
Transmission Codes P1870 and P1811

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