Transmission Acting Weird, Possible TCC Sol.? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


GMC/Chevrolet Truck/SUV When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 12-28-2012, 06:01 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2012
Location: Bloomington, MN
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Ol"_Rusty is on a distinguished road
Default Transmission Acting Weird, Possible TCC Sol.?

I have a 2000 GMC Sierra with a 5.3L V8 and my transmssion does this weird thing were when Im just cruising with my foot lightly on the gas it will drop rpm suddenly and kinda bog. if i push harder on the peddle the tranny starts to kinda shutter until i hit the kick down point and then its fine again until i go back to lightly pressing the gas peddle. I also tried tapping the brake a little bit when i do it and itll make it go back to normal rpm for a few seconds and then just drop back down. I can just hit tap the brake and everytime its like it clears the problem for a few seconds and then it happens again. Anyone know what this exact problem is?
Ol"_Rusty is offline   Reply With Quote
Old 12-28-2012, 08:15 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Have the truck scanned at a transmission shop to see if any trans codes show up. It kind of sounds like your torque converter isn't locking and unlocking right.
Danthurs is offline   Reply With Quote
Old 12-28-2012, 10:35 PM   #3
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

When was the last time you did a tune up?
Mike is offline   Reply With Quote
Old 12-29-2012, 10:44 AM   #4
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

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).
Condition
Some customers may comment on a harsh 1-2 upshift and the Check Engine Light or Service Engine Soon indicator is illuminated.
Diagnosis
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 93C (200F).
Cause
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.

Important
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).
Correction
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.

Important
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
jwfirebird is offline   Reply With Quote
Old 12-30-2012, 06:55 PM   #5
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2012
Location: Bloomington, MN
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Ol"_Rusty is on a distinguished road
Default

i have no codes and ive even done a datastream to make sure that the tcc is being told when to lock up and everything seems to be normal
Ol"_Rusty is offline   Reply With Quote
Old 12-30-2012, 07:11 PM   #6
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Tuneup?
Mike is offline   Reply With Quote
Old 02-07-2013, 03:55 PM   #7
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2012
Location: Bloomington, MN
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Ol"_Rusty is on a distinguished road
Default

like what kind of tune up? lol
Ol"_Rusty is offline   Reply With Quote
Old 02-07-2013, 05:01 PM   #8
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

It may not be the transmission, but the engine that is causing the problem. I have an issue on my car where the engine will stumble under very light acceleration. If I am in bumper to bumper traffic and want to move up a few feet, it will sometimes stumble. If I am on cruise control and it calls for slight acceleration to compensate for going up a hill, it will stumble. Never under mild to full acceleration, only the slightest of acceleration.

I suspected the throttle position sensor, but a scan shows uniform increase as I push the gas pedal down. I don't know what the answer is, but I just wanted to suggest your problem may not be transmission related.
2kg4u is offline   Reply With Quote
Old 02-18-2013, 09:02 PM   #9
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2012
Location: Bloomington, MN
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Ol"_Rusty is on a distinguished road
Default

thanks ill look it up
Ol"_Rusty is offline   Reply With Quote
Old 02-19-2013, 07:16 PM   #10
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2012
Location: Bloomington, MN
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Ol"_Rusty is on a distinguished road
Default

what are the common symptoms for a bad torque converter or the sylenoid?
Ol"_Rusty is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Car acting really weird calaeb0896 1992-1999 3 02-28-2008 08:07 PM
TCC problem p0742 tcc stuck in locked position San Juan Cruiser 2000-2005 8 10-20-2007 01:00 PM
weird weird and really weird 3064datazz 1992-1999 42 07-19-2007 02:03 PM
Still acting weird! FIXED Torque converter EWC88 2000-2005 20 10-25-2006 09:43 PM
HELP!!! 1997 SSEi Wipers Are Acting WEIRD!!! Mr Bean 1992-1999 4 01-21-2003 01:25 PM


Tags
electrical problem, sierra, transmission, transmission issues

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:03 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.