Transmission Out-of-Round Snap Rings

A slipping Drive or no Drive condition may be present along with DTCs P0746 (Transmission Control Solenoid Valve 1 Stuck Off) or P0747 (Transmission Control Solenoid Valve 1 Stuck On) on some 2024 Encore GX, Enclave, XT4, XT5, XT6, Blazer, Trailblazer, Traverse, Traverse Limited, Acadia and Terrain models equipped with a GF8 8T65 or GF9 9T45/50/60/65 automatic transmission (RPO M3F, M3W, M3H, M3G, M3T, M3V, MF8, M3U).

The Drive conditions may be caused by an out-of-round snap ring, including the 1-2-3-4-5-6 Clutch Spring Retaining Ring (Fig. 8, #594) or 1-2-3-4-5-6 Clutch Backing Plate Retaining Ring. (Fig. 8, #599)

 

Fig. 8

 

If these conditions are found, check the transmission Julian build date and refer to #PIP5974B. (Fig. 9) If the transmission matches the build dates and DTC P0746 or P0747 resets on a short test drive, or the transmission slips in Drive, the transmission should be disassembled and inspected for damage.

 

Fig. 9

 

The following parts will need to be replaced:

• 1-Reverse and 1-2-3-4-5-6 Clutch Piston Housing
• 1-2-3-4-5-6 Clutch Piston Inner Seal
• 1-2-3-4-5-6 Clutch Piston
• 1-2-3-4-5-6 Clutch Piston Return Spring
• 1-2-3-4-5-6 Clutch Spring Retaining Ring
• 1-2-3-4-5-6 Clutch Plate – Wave
• 1-2-3-4-5-6 Clutch Plate
• 1-2-3-4-5-6 Clutch Plate – Friction
• 1-2-3-4-5-6 Clutch Backing Plate
• 1-2-3-4-5-6 Clutch Backing Plate Retaining Ring
• 1-2-3-4-5-6 Clutch Piston Seal

TIP: Do not replace the control valve body assembly (valve body) or control valve solenoid body assembly (solenoid body).

Follow the proper procedures and all other service recommendations in the appropriate Service Information when making repairs to the transmission.

To view a video with additional repair instructions, check out course 57560.01V Transmission Unit Repair: 9-Speed Clutch Replacement on the Center of Learning.

Refer to #PIP5974B for more information.

Thanks to Mark Kevnick