[Manitcor]

Subject: 4T65-E Transmission Delayed Shifts, Slips, Flares or Extended Shifts During Cold Operation (Replace Shift Solenoid Valve Assembly)


Models: 2001 Buick Century, LeSabre, Park Avenue, Regal
2001 Chevrolet Impala, Lumina, Monte Carlo, Venture
2001 Oldsmobile Aurora, Intrigue, Silhouette
2001 Pontiac Aztek, Bonneville, Grand Prix, Montana
with 4T65-E Automatic Transmission (RPOs MN3, MN7, M76, M15)


Condition:
Some owners may comment on one or several delayed shifts, slips, flares or extended shifts during cold operation. These symptoms can affect the 1-2 shift only. The transmission won't shift out of 1st gear until the temperature is high enough to unstick the solenoid. This condition can last up to several shift patterns. These symptoms can return after the vehicle sits, usually 6 hours or more.


Cause:
The 1-2, 3-4 shift solenoid valve not exhausting may be the cause of these conditions.


Correction:
Replace the 1-2, 3-4 shift solenoid valve. Refer to the appropriate Service Manual information for replacement procedure.


Parts Information:
Part Number Description Qty
24219819 1-2, 3-4 Shift Solenoid 1


Parts are currently available from GMSPO.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.


© Copyright General Motors Corporation. All Rights Reserved.