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Chevrolet Venture, Pontiac Montana, Oldsmobile Silhouette, Van
#254 of 1617 Harsh shift on 1996-2000 Venture, Pontiac, Olds Minivans
Aug 09, 2002 (9:57 am)
TSB # 01-07-30-023A
Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body)
1996 Buick Roadmaster
1996 Cadillac Fleetwood
1999-2000 Cadillac Escalade
1996-2000 Chevrolet Camaro, Corvette
1996-2000 Pontiac Firebird
1996-2000 Chevrolet and GMC Light Duty Truck Models
1996-2000 Oldsmobile Bravada
with 4L60-E Automatic Transmission (RPO M30)
Built Prior to January 15, 1999 (Julian Date 9015)
This bulletin is being revised to update the Parts Information. Please discard Corporate Bulletin Number 01-07-30-023 (Section 07 -- Transmission/Transaxle).
Some customers may comment on a harsh 1-2 upshift and the Check Engine Light or Service Engine Soon indicator is illuminated.
Typically, these vehicles will have been driven more than 32,000 km (20,000 mi) before this condition occurs.
The scan tool may show a DTC P1870 set as a history code.
A harsh 1-2 shift or DTC P1870, caused by wear in the control valve body, may be difficult to duplicate when the transmission temperature is below 93°C (200°F).
The condition may be due to wear in the control valve body. This wear occurs in the bore that contains the TCC isolator and regulator valves, and results in poor, or no, TCC apply.
DTC P1870 is a type B code. The conditions for setting the P1870 DTC must occur on TWO CONSECUTIVE TRIPS (ignition cycles, with a drive cycle) before setting a P1870 history code.
When the conditions for setting DTC P1870 are met (first trip), the PCM commands maximum line pressure and harsh 1-2 shifts are the result.
This may result in a harsh 1-2 shift with no history code if the conditions for setting the DTC required for the second trip are not met, on two consecutive trips (Ignition cycles, with a drive cycle).
When the conditions for setting the DTC are met, on the second consecutive trip, a DTC P1870 is stored as a history code.
When the P1870 code is stored, the PCM will turn on the Service Engine Soon (SES), Check Engine Light (CEL), or Malfunction Indicator Lamp (MIL).
Install a control valve body with the revised TCC regulator and isolator valves. These valves are used in all transmissions produced after January 15, 1999 (Julian Date 9015), and all of the service parts currently available through GMSPO contain revised TCC regulator and isolator valves.
If all of the following conditions are true, it is not necessary to rebuild the transmission or to replace additional transmission components beyond the control valve body.
Transmission operation is normal before the transmission reaches operating temperature, or before DTC P1870 is set (no slips, flares, or missing gears).
The torque converter is not blue or overheated.
The transmission fluid is not burned or has no burned odor.
The transmission fluid pan contains no abnormal debris (clutch material, bronze, brass, or metal fragments
#255 of 1617 Thanks to all...
Aug 09, 2002 (10:01 am)
who answered my inquiry. Someone on the Transmission Trauma topic board supplied the above TSB for me. My car had the exact problem as listed here, diagnosed today. My check engine light never illuminated, but the code was stored. So if anyone experiences this, expect a $500 bill. Thanks again for the input. That's what is so great about this board, people helping each other...
#256 of 1617 Wierd electrical problems
Aug 12, 2002 (5:03 am)
Just came back from our 1st extended trip with our 2001 Venture LT. Van performed well except for the following incident;
3 hours into the trip, the seatbelt light came on even though all seat belts were fastened. Then,after stopping for lunch, the FOB would not work, had to unlock doors with key. Started the van, put the van in drive but the automatic door locks did not work. Had to close them by hand.
Then once we got on the highway, the auto alarm started coming on all by itself. We would shut it off with the FOB, but one minute later it would go on again. This occurred for the next 30 miles.
Called ONSTAR, they ran a diagnostic but could not find anything wrong. Then the alarm stopped and the symptoms never reappeared. ANY THOUGHTS?
Aug 12, 2002 (6:01 am)
I believe there is a thing called BCM Body control Module or something like that that controls the functions you had problems with. Buick Rendevous/Pontiac Aztek uses simular controls and there have been posts about problems, can not recall any van problems. Would not have any specific warning lamps on the dash and probably not something OnStar could pick up on.
Call you dealer, may have to reprogram or replace. Good Luck and post back.
#258 of 1617 Potential owner
Aug 12, 2002 (6:38 pm)
Hello over here in Chevy Venture land. My husband and I have been playing some numbers games with the Honda dealers over the 2002 Odysseys. I am truly exhausted and decided to check out some Amerian models. I am interested in possibly the Venture with the Warner Bros. package. Any feedback or suggestions? I didn't realize there were so many choices in those models! Do
#259 of 1617 olds sil
Aug 12, 2002 (7:31 pm)
hello gm van owners, I'm a longtime edmunds reader, occasional poster...
I posted a message about a month or so ago, decided to get one of the gm vans (used, 99 - 01 extended). Taking my time looking, but have begun checking some out here & there
Amusing to look over various websites where people post reviews of the vans...you really wonder how they can possibly be talking about the same vehicles! one will say "way underpowered" another will say "wonderful power." One will say "horrible engine/highway noise" another will say "its so quiet I can't tell its running." One will say "nothing but trouble" and outline about 50 things that have gone wrong in like, a year, and the next review will say "we've driven the heck out of this van for 3 solid years and the absolute only problem is a flimsy cupholder." And the list goes on & on......
anyway, my questions for the gm van experts here: first, how much stock should I put in the edmunds website used car "custom appraisal" feature? I found a 99 sil. premier in really great shape, beatiful cond, runs great, well-maintained...however it has 66000 miles. the edmunds appraisal says (private party sale) should be ~$13600 (US), going down to ~13000 with the fairly high miles. I offered the guy 14000 (he's asking 16300), he said he'd go 15000 rock bottom...well heck! I don't know if 14 is 1000 bucks too much, or if 15 is a good deal! (he, of course thinks he's givin' it away for 15, lol)
I guess where i'm coming from is, (besides edmunds quote) is that by the time our 36 month loan is paid off, this vehicle will be well over 100000 miles, at which point, imo, the trade in/resale value plummets, regardless of whether its still in great shape....do you all think $15000 is too much? edmunds prices are much more "real world" than kelly b.b., but that ($13000) almost seems a bit low.
Question 2: I understand all 3 gm vans are mechanically pretty much identical, but are there fit & finish, build quality, etc. differences between chevy/pont/olds? (or should I just follow the old advice of getting one built on say, a thursday and not a monday!)
thanks for any input!
Aug 12, 2002 (8:03 pm)
Any idea how long the guy has been trying to sell the '99? He may come around to "our" way of thinking if he doesn't get any action for a couple of weeks. There's a lot of used cars out there due to the 0% financing. Try checking your local paper or car lots for some more comps too, and good luck.
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#261 of 1617 Jeber on '99 Olds Silo
Aug 13, 2002 (8:42 am)
I have a '99 Venture Ext. with 56,000 miles on it, power door, traction control, CD/tape etc. and would be happy to get 12,000 for it. I think your guy is way over priced. Seems like he is either upside-down on his loan or out to make enough $ for a downpayment on something else. Keep looking, there are tons of these vans coming off lease and dealers are only asking $14,000. My $.02 worth.
#262 of 1617 leaning towards chevy......
Aug 13, 2002 (9:37 am)
I know he's been advertising that premier for at least 3 weeks...probably the only reason he went down to 15! I got the feeling that he's not too pressed, financially, to get rid of it. He'll probably just sit on it till someone gives him 15 or more... but maybe he'll get a harsh dose of reality, too!
Comparable vans are priced around 16-ish...but most all of us who sell used vehicles in the classifieds play the game of pricing it 10 or 20 % over what you really want to get. Hard to tell what people are really getting versus what they were asking
I think I've pretty much decided that unless he goes to 14000, I'll just look for a venture. For $15000 I can get a (00 or maybe even 01) venture with half-or-less that many miles. My wife is attracted to the leather & "gadgets" on premier, but I really couldn't care less--as long as i have ac & cruise I'm good (although honestly power windows are darn handy--and we did see a couple ventures without 'em!)
In fact the "self-leveling" suspension feature on sil. worries me a bit, I've heard more than a couple horror stories over the years, of cars with that pneumatic suspension stuff (caddies, subarus, & others) where they start having problems with those compressors, valves, hoses & lines, and nobody can ever get the %&%$ thing working right again.
So, the search continues! thanks for the input
#263 of 1617 bad news
Aug 13, 2002 (10:04 am)
Just got my report from Blackstone. Oil has antifreeze in it. Not much, but it's there. They suggest I increase oil changes and try to live with it. Problem is, will it get worse? What is the big fix? Are there any little fixes?