Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2021TERRAIN SLT, 4WDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - 9T45 (M3U) OR 9T50 (M3D M3H) - DESCRIPTION AND OPERATION
2021 GMC Terrain SLT, 4WD
Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Description And Operation
2021 GMC Terrain SLT, 4WDSECTION Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Description And Operation
- Description and Operation
- Definitions and Abbreviations
- Transmission Identification Information
- Control Valve Solenoid Body Identification Information
- Transmission General Description
- Transmission Component and System Description
- Manual Mode Description and Operation
- Transmission Adaptive Functions
- Transmission Indicators and Messages
- Electronic Component Description
- Mechanical Powerflow from the Torque Converter to the Turbine Shaft - Engine Running
- Park - Engine Running (Hydraulic Circuits Without ETRS)
- Park - Engine Running (Hydraulic Circuits With ETRS)
- Park - Engine Running (Mechanical Powerflow)
- Reverse (Hydraulic Circuits Without ETRS)
- Reverse (Hydraulic Circuits With ETRS)
- Reverse (Mechanical Powerflow)
- Neutral - Engine Running (Hydraulic Circuits Without ETRS)
- Neutral - Engine Running (Hydraulic Circuits With ETRS)
- Neutral - Engine Running (Mechanical Powerflow)
- Drive Range, First Gear (Hydraulic Circuits Without ETRS)
- Drive Range, First Gear (Hydraulic Circuits With ETRS)
- Drive Range, First Gear (Mechanical Powerflow)
- Drive Range, Second Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Second Gear (Hydraulic Circuits With ETRS)
- Drive Range, Second Gear (Mechanical Powerflow)
- Drive Range, Third Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Third Gear (Hydraulic Circuits With ETRS)
- Drive Range, Third Gear (Mechanical Powerflow)
- Drive Range, Fourth Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Fourth Gear (Hydraulic Circuits With ETRS)
- Drive Range, Fourth Gear (Mechanical Powerflow)
- Drive Range, Fifth Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Fifth Gear (Hydraulic Circuits With ETRS)
- Drive Range, Fifth Gear (Mechanical Powerflow)
- Drive Range, Sixth Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Sixth Gear (Hydraulic Circuits With ETRS)
- Drive Range, Sixth Gear (Mechanical Powerflow)
- Drive Range, Seventh Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Seventh Gear (Hydraulic Circuits With ETRS)
- Drive Range, Seventh Gear (Mechanical Powerflow)
- Drive Range, Eighth Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Eighth Gear (Hydraulic Circuits With ETRS)
- Drive Range, Eighth Gear (Mechanical Powerflow)
- Drive Range, Ninth Gear (Hydraulic Circuits Without ETRS)
- Drive Range, Ninth Gear (Hydraulic Circuits With ETRS)
- Drive Range, Ninth Gear (Mechanical Powerflow)
- Fluid Passages (Hydraulic Circuits Without ETRS)
- Control Valve Solenoid Body - Fluid Pan Side
- Control Valve Solenoid Body - Control Valve Body Side
- Control Valve Body Spacer Plate - Control Valve Solenoid Side
- Control Valve Body - Control Valve Solenoid Body Side
- Control Valve Body - Case Side
- Control Valve Body Spacer Plate - Case Side
- Automatic Transmission Case - Control Valve Body Side
- Automatic Transmission Case - Torque Converter Housing Side
- Torque Converter Housing - Automatic Transmission Case Side
- Auxiliary Control Valve Body Spacer Plate - Drive Sprocket Support Side
- Drive Sprocket Support - Torque Converter Housing Side
- Drive Sprocket Support - Automatic Transmission Fluid Pump Side
- Automatic Transmission Fluid Pump Gasket - Drive Sprocket Support Side
- Automatic Transmission Fluid Pump - Drive Sprocket Support Side
- Fluid Passages (Hydraulic Circuits With ETRS)
- Control Valve Solenoid Body - Fluid Pan Side
- Control Valve Solenoid Body - Control Valve Body Side
- Control Valve Body Spacer Plate - Control Valve Solenoid Side
- Control Valve Body - Control Valve Solenoid Body Side
- Control Valve Body - Case Side
- Control Valve Body Spacer Plate - Case Side
- Automatic Transmission Case - Control Valve Body Side
- Automatic Transmission Case - Torque Converter Housing Side
- Torque Converter Housing - Automatic Transmission Case Side
- Auxiliary Control Valve Body Spacer Plate - Drive Sprocket Support Side
- Drive Sprocket Support - Torque Converter Housing Side
- Drive Sprocket Support - Automatic Transmission Fluid Pump Side
- Automatic Transmission Fluid Pump Gasket - Drive Sprocket Support Side
- Automatic Transmission Fluid Pump - Drive Sprocket Support Side
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.