No 4th, 5th, and 6th Gears

Some 2015-2016 Silverado, Suburban, Tahoe, Sierra, Yukon and Yukon XL models equipped with the 6L80 automatic transmission (RPO MYC) may have a condition where the 4th, 5th, and 6th gears cannot be engaged. DTC P0796 (Pressure Control Solenoid Valve 3 – Stuck Off) may be set and the Check Engine MIL may be illuminated.

 

These conditions may be caused by a broken 4–5–6 Clutch (with the Output Carrier Shaft) Hub Assembly. (Fig. 17) The fluid pan assembly will be clean, containing little or no debris, and the fluid will be clean with no visible signs of distress.

 

F17 output shaft

Fig. 17

 

If the 4–5–6 Clutch Hub Assembly is broken, replace the assembly. (Fig. 18)

 

If DTC P0796 is set along with the 4–5–6 Clutch Hub Assembly being broken, the Control Solenoid Valve and Transmission Control Module Assembly (or TEHCM – Transmission Electro-Hydraulic Control Module) is not the cause and should not be replaced.

 

F18 clutch assembly

Fig. 18

 

– Thanks to Mike Johnston

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