4L60E M30, 4L65E M32 Transmission - Leaking and/or Broken Trans Case at 2-4 Servo Cover - kw automatic clutch drive first fourth gear leak no noise oil reverse second shift third PQC

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

The 4L60E/4L65E automatic transmission may experience a leak, inoperative/slipping in 2nd, 3rd and 4th gears or no movement (no forward or reverse) due to excess fluid loss. This condition normally occurs at low mileage, usually under 1,000, and diagnosis may show a cracked or broken case at the 2/4 servo bore. This condition may be caused by a 2/4 servo cover retaining ring that was not fully seated during transmission assembly. Pressure from the servo cover against the partially seated retaining ring can cause the case to crack or break.

If the fluid level drops due to the leak, it is likely that the 3/4 clutches will be damaged. This condition can usually be repaired by replacing the case and any damaged clutches.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

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