It has a code of PO742. It feels like you are driving a stick shift not knowing how to use the clutch when it changes gears. This happens after the car has warmed up. The code says that the torque converter circuit is stuck on. Should I replace the silenoid? It is a 4t65e transmission.
P0742 Torque Converter Clutch Circuit Stuck On
TSB #00-07-30-007A: Whine Noise in Park or Neutral,
Service Engine Soon or Service Vehicle Soon Lamp Illuminates (Replace
Drive Sprocket Support Bearing) - (Jan 30, 2002)
Subject: Whine Noise In Park Or Neutral, Service Engine Soon or Service Vehicle Soon Lamp Illuminates (Replace Drive Sprocket Support Bearing)
Models:
1999-2000 Buick LeSabre, Park Avenue/Ultra, Regal, Riviera
1999-2000 Chevrolet Lumina, Monte Carlo, Venture
2000 Chevrolet Impala
1999 Oldsmobile Eighty Eight
1999-2000 Oldsmobile Intrigue, Silhouette
1999-2000 Pontiac Bonneville, Grand Prix, Montana with 3.4L, 3.5L or 3.8L Engine (VINs E, H, K, 1 -- RPOs LA1, LX5, L36, L67)
and Hydra-Matic 4T65-E Transaxle/Transmission (RPOs MN3, MN7, M15)
This bulletin is being revised to add the Chevrolet Impala to the models affected. Please discard Corporate Bulletin Number 00-07-30-007 (Section 07 - Transmission/Transaxle).
Condition
Object 
(1) Transmission ID Location
(2) SRTA Tag Location
(3) Hydra-Matic 4T65-E SRTA Tag
(4) Model Year (9 = 1999)
(5) Control Number
(6) Transmission
(7) Serial Number
(8) Julian Date
(9) Calendar Year (9 = 1999)
(10) Model
(11) Hydra-Matic 4T65-E ID Tag
(12) Model Year (9 = 1999)
(13) Line Built (1 = Line 1; 2 = Line 2; 3 = Line 3; 4 = Line 4)
(14) Transmission
(15) Julian Date
(16) Shift Built (A = First Shift; B = Second Shift; C = Third Shift)
(17) Model
(18) Serial Number in Base Code 31
(19) W = Warren Plant
(20) Hydra-Matic 4T65-E
(21) Model
Some owners of the above models equipped with a Hydra-Matic 4T65-E transaxle with a Julian Date prior to 0045 may comment on a whine noise in PARK and/or NEUTRAL or a Service Engine Soon or Service Vehicle Soon lamp that is illuminated. Upon investigation, a DTC P0741 or P0742 may be found.
Cause:
The above condition may be due to drive sprocket support bearing fluting and/or bearing failure.
Correction:
Replace the drive sprocket support bearing. Inspect the channel plate and drive sprocket for any abnormal wear, Turbine shaft for cut seals and/or nicks, and chain for excessive play due to failed bearings.
Important:
When installing the new bearing, the part number MUST be visible (facing upward). Before installing the drive sprocket, lubricate the bearing assembly with J 36850 assembly lubricant.
Refer to the 4T65-E Unit Repair Section for the installation procedure.
Service Part Information:
Part Number: 24214158
Description: Drive Sprocket Support Bearing
Parts are currently available from GMSPO.
Its possible that you can use a voltmeter to test for power and ground
at the TCC solenoid connector and also resistance across the solenoid.
The scan tool is helpful in pulling the codes, commanding the TCC on and
off and monitoring the state of command while driving.
Hope help with this (remem,ber comment and rated this).
P0742
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