[trickedastro99]

as the title says im throwing code p1870 ...

printout the guy at autozone give me says ... Transmission componet slipping.

Explanation: Transmission is in 4th gear with TCC engaged and the ECM has detected excessive slippage when comparing the input shaft speed to the output shaft speed.

Probable cause:
bb1-trailer towing may set code (no trailer hitch)
bb2-check transmission fluid level (looks good to me but im gonna change it this weekend to be sure)
bb3-internal transmission fault (i hope not but if it is it prolly the torque converter slipping at highway speeds)

anyway about it from the looks of it ill be ok for a little while at city driving speeds until i can take it to a transmission specialest and get it checked out ... does anyone have experience changing the tranny on one of these vans in case i have to? it is a 2 wheel drive. I have mechanical knowledge and know how on doing the work since i have been doing motor swaps in hondas so im not afraid to get my hands dirty and considering its rear wheel drive it should be easier than changing the transmission on a front wheel drive honda.

 

[trickedastro99]

well i got the code cleared and drove around town for about an hour with no problems then took it out on the highway and drove 55 for a bit no problem then took it on interestate at 75 the light came back on so its only slipping at high speeds.

 

[trickedastro99]

after reading through the transmission section of the forums it appears our vans have troublesome transmissions but with a rebuild i should be ok "IF" it needs it.

 

[gtkane]

1870 is what I call the money code.

When a van/car/truck/wagon comes into the shop with this code, usually the trans is gettin' a rebuild.

Chances are, if it's slipping at high speed, the 2-4 band and the 3-4 clutches are shot.

 

[trickedastro99]

thanks for your input on the subject ... i guess ill have to find a reputable transmission specialist around here

 

['cudapaul]

There is a recognized problem in the 4L60E valve body that commonly causes this problem.

You may want to discuss this with a good old school trans shop, they may be able to repair the vavle body without re-doing the entire trans. There are a special parts assembly for the replacement valve and a tool that is used to oversize the worn hole.

 

[trickedastro99]

while driving today at about 60 mph the code went away and i thought well this is odd. so i kept driving at various speeds including 70+ to try to make the code reappear and it didnt. I hate to chance this on good luck and was hoping someone could shine some light on this possibly something to do with the valve body being stopped up and unstopping as mentioned above ^^^ ??? thank you for any help provided