Dtc 1870

[pharm_rodeo]

I think some of you might know that I had my 98 Rodeo auto tranny rebuilt in late August of this year. A few days after the rebuild I got a CT and CE lights. Went to the shop and they stated it was 1870. The tech said it may have been a stored code since my tranny was in horrible shape before the rebuild. I just got the lights again and the code is again 1870.

I searched but only found a few threads about the code and no one has updated their problem. From my research it seems that it may be a valve body problem or TCC? All my gears shift fine, but when I get on the highway and hit 60mph there is a slight jerk. After a few times of this the lights came on. I checked the fluid and it is perfect. After a few cycles w/o hitting the highway the lights turn off. I sent the shop an email asking if they did any work in the TC and if their 36 month warranty covers repairs if necessary.

Any comments?

BTW, could this be TC shudder?

I found this article online:

Isuzu
MIL illuminated, DTC 1870 stored in PCM memory. Some 19?6-99 Troopers and Rodeos, 1998-99 Amigos and 1999 VehiCross models may turn on the MIL and store DTC 1870 in computer memory. According to Isuzu powertrain engineers, the problem is often accompanied by a blinking or steady Check Trans light, and is most likely due to insufficiently tightened converter housing-to-main case bolts. The loose bolts cause the separator plate gaskets to slip out of position. That causes an internal pressure leak, which in turn causes the fluid pressure to the lockup clutch to drop like a rock. It's this pressure loss that causes the MIL to illuminate and the DTC to set.
The fix involves tearing down the box and installing new gaskets (Part No. 8-96016-514-0) on both sides of the separator plate. Tightening the converter housing-to-main case bolts in a cross pattern to an upwardly revised torque spec of 40 ft.-lbs. prevents the gaskets from taking another walk. GM Truck

[Ramblin Fever]

That is in fact the code that transmission gives when it's slipping/failing; hopefully it's covered under their warranty. Otherwise, looks like your in for another transmission overhaul, yes, I believe it's TC related.

This is the code that many many Chevy/GM auto transmission owners dread - and not just the transmissions in Isuzu's, many many more victims are drivers of Chevy Blazers, Tahoe's, and S-10's.

FWIW - I'm not knocking GM/Chevy transmissions, good Lord knows I've had/have well over 100k miles of excellent good-fortune with mine. And I honestly believe GM transmissions are 100% better then either Ford or Dodge's auto's - just stating facts that I've read from other Chevy/GM/Tahoe/Trail-blazer forums.

Pharm Rodeo - my opinion, if it's not covered under their warranty, check into finding a used transmission from a junk-yard, unless they can offer another warranty for the TC.

[trooperbc]

sounds like you need to take that 'article' into your trans shop and *tell* them they need to make good on this

what's the source, anyway?

[pharm_rodeo]

Originally Posted by Ramblin Fever

That is in fact the code that transmission gives when it's slipping/failing; hopefully it's covered under their warranty. Otherwise, looks like your in for another transmission overhaul, yes, I believe it's TC related.

If he tells me that it's a TC issue thats fine, but if he says it's an internal tranny problem his warranty will cover it since that's what it actually covers.
There is no way in hell I’m going to pour more money into this tranny..lol. I think they did a good job on the rebuild but I’m not sure if they did any TC work. I’m pretty sure the shop owner will cover most of the repair costs. He was a reputation of refunding your money if you’re not satisfied. At the least I’m sure he will work with me

From the reading I’ve been doing, it seems that a lot of GM owners have gotten the 1870 code after a rebuild. Most have needed TC repairs. Some were told to get a tranny rebuild and still had the code come back. I personally don’t think it’s an internal tranny problem. The only problem I’m having is the highway issue. I’ll have to take the truck in soon AND wait for 2eyefishclaw to respond.

[pharm_rodeo]

Originally Posted by trooperbc

sounds like you need to take that 'article' into your trans shop and *tell* them they need to make good on this

what's the source, anyway?

http://www.findarticles.com/p/articl..._n9439008/pg_2

[pharm_rodeo]

Anyone have more info on this TSB:



SB03-05-S001 TSB Date: 5/1/2003 Component:CASE, A/T:COMPUTERS AND CONTROL SYSTEMS:TRANSMISSION CONTROL SYSTEMS:VALVE BODY, A/TSummary:A/T - MIL ON/DTC P1870 STORED IN MEMORY