ATSG CONFIRMED FIX - SEPTEMBER 2025
2021 Chevy Suburban 10L80
Complaint: No Reverse, setting code P0776
Cause: Valve Body separator plate screen fell out and stuck the 1-2-8-9-10-Reverse Valve
Correction: Replace the separator Plate.
Part numbers related to the repair: 24299522
Year Make and Model of the Vehicle: 2021 Chevy Suburban
Mileage: NA
Shop Name: Highland Transmission
Transmission: 10L80
Additional Notes: The transmission was taken apart and the technician did not see any internal issue with the clutches. While inspecting the valve body the tech noticed a piece of material that was stuck in the valve bore. During further inspection of the separator plate he discovered one of the filter screens was missing in the location of the valve bore.
Pictures/Diagram: Check the attachments
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