Technical Service Bulletins

Trans Woes

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Trans Woes

This bulletin applies to 2011 Buick Regal models equipped with the 6T40/45 automatic transmission, built on or before Jan. 15, 2011.

Some customers may comment on any of the following conditions:

  • Slip or flare in reverse
  • No reverse
  • Slip or flare in third gear
  • No third gear
  • MIL illuminated

The technician may find DTC P0776 stored as an active or a history code in the TCM.

This condition may be caused by a broken 3-5-R apply (waved) plate. It is recommended that a new 3-5-R piston and waved plate be installed any time the transmission is disassembled for any reason.

Debris generated by the condition must be cleaned from the entire transmission and the pump fluid filter and the control solenoid filter plate must be replaced. These parts are included in the seal kit. Failure to separate case halves, disassemble the transmission, clean the debris and replace the pump fluid filter and the control solenoid filter plate could lead to repeat transmission damage.

The notches in the 3-5-R piston were removed during the 2001 model year. When repairing a broken 3-5-R apply plate, or any time the transmission is disassembled, be sure to replace any 3-5-R wave plate with notches.

P/N                             ITEM

24259061…………….Piston, 3-5-REV Clutch (without notches)

24230757…………….Plate, 3-5-REV clutch apply (wave) plate

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