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 MANUALSBUICK2010LUCERNE CXL, 3.9 1REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - 4T65-E - DESCRIPTION AND OPERATION
2010 Buick Lucerne CXL, 3.9 1
Automatic Transmission - 4T65-E - Description And Operation
2010 Buick Lucerne CXL, 3.9 1SECTION Automatic Transmission - 4T65-E - Description And Operation
- Description and Operation
- Transmission General Information
- Definitions and Abbreviations
- Transmission Identification Information
- Transmission General Description
- Transmission Component and System Description
- Transmission Adaptive Functions
- Electronic Component Description
- Vehicle Speed Sensor
- Automatic Transmission Input Speed Sensor
- 1-2 and 2-3 Shift Solenoid Valves
- Pressure Control Solenoid Valve
- Torque Converter Clutch Pulse Width Modulation Solenoid Valve
- Automatic Transmission Fluid Pressure Manual Valve Position Switch
- Lever Assembly-Manual Shaft Detent with Internal Mode Switch
- Automatic Transmission Fluid Temperature Sensor
- Automatic Transmission Inline 20-Way Connector Description
- Automatic Transmission Hydraulic Diagrams
- Park or Neutral - Engine Running (Park)
- Notes
- Pressure Regulator Valve (313)
- Actuator Feed Limit Valve (414)
- Pressure Control (PC) Solenoid Valve (322)
- Torque Signal Regulator Valve (321)
- Line Pressure Relief Valve (324)
- Manual Valve (404)
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly (34)
- 1-2, 3-4 Shift Solenoid Valve (315A)
- 2-3 Shift Solenoid Valve (315B)
- 1-2 Shift Valve (318)
- 2-3 Shift Valve (357)
- 1-2, 2-3 and 3-4 Accumulator Valves (350, 344, 341)
- 1-2, 2-3 and 3-4 Accumulator Assemblies
- Pressure Regulator Valve (313) (Torque Converter/Cooler and Lube Circuits)
- TCC Control Valve (335)
- Park - Engine Running
- Park or Neutral - Engine Running (Neutral)
- Reverse
- Overdrive Range, First Gear
- Overdrive Range, Second Gear
- Notes
- 1-2, 3-4 Shift Solenoid (SS) Valve (315A)
- 1-2 Shift Valve (318)
- Number 2 Ball Check Valve (372)
- Second Clutch
- Input Clutch
- Input Sprag Clutch
- Forward Band
- 1-2 Support Roller Clutch
- 1-2 Accumulator
- 1-2 Accumulator Valve
- TCC Control Pulse Width Modulated (PWM) Solenoid Valve
- Torque Converter Clutch
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- Overdrive Range, Second Gear - A/T System Hydraulic Diagram
- Overdrive Range, Third Gear - Torque Converter Clutch Not Applied
- Notes
- 2-3 Shift Solenoid (SS) Valve (315)
- Number 9 Ball Check Valve (372)
- Number 4 Ball Check Valve (372)
- 2-3 Shift Valve (357)
- Third Clutch
- Third Roller Clutch
- Input Clutch
- Forward Band
- 1-2 Support Roller Clutch
- 2-3 Accumulator
- 2-3 Accumulator Valve
- Torque Converter Clutch
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- Overdrive Range, Third Gear - A/T System Hydraulic Diagram
- Overdrive Range, Fourth Gear - Torque Converter Clutch Not Applied
- Notes
- 1-2, 3-4 Shift Solenoid (SS) Valve (315)
- 1-2 Shift Valve (318)
- 3-4 Shift Valve (362)
- Fourth Clutch
- Third Clutch
- Third Roller Clutch
- Second Clutch
- Forward Band
- 1-2 Support Roller Clutch
- 3-4 Accumulator
- 3-4 Accumulator Valve
- Torque Converter Clutch
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- Overdrive Range, Fourth Gear - Torque Converter Clutch Not Applied - A/T System Hydraulic Diagram
- Overdrive Range, Fourth Gear - Torque Converter Clutch Applied
- Notes
- TCC Control (PWM) Solenoid
- TCC Regulator Valve
- TCC Control Valve
- Torque Converter Clutch
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- Cooler Check Valve
- Number 1 Ball Check Valve (372)
- Converter Clutch Blow-off Valve
- Overdrive Range, Fourth Gear - Torque Converter Clutch Applied - A/T System Hydraulic Diagram
- Overdrive Range, 4-3 Downshift - Torque Converter Clutch Not Applied
- Notes
- Pressure Control (PC) Solenoid
- Pressure Regulator Valve
- TCC Control (PWM) Solenoid Valve
- TCC Control Valve
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- 1-2, 3-4 Shift Solenoid (SS) Valve (315)
- 3-4 Shift Valve (362)
- Fourth Clutch
- 3-4 Accumulator
- 3-4 Accumulator Valve
- Overdrive Range, 4-3 Downshift - A/T System Hydraulic Diagram
- Drive Range, Manual Third (from Overdrive Range)
- Drive Range, Manual Second (from Drive, Manual Third)
- Notes
- Manual Valve (404)
- Number 8 Ball Check Valve (372)
- 2-3 Shift Valve (357)
- Manual 2-1 Servo Assembly (104-115)
- Number 4 Ball Check Valve (372)
- 2-3 Shift Solenoid (SS) Valve (315)
- 3-2 Manual Downshift Valve (356)
- Pressure Control (PC) Solenoid
- Torque Converter Clutch
- Drive Range, Manual 2nd - A/T System Hydraulic Diagram
- Drive Range, Manual First (from Drive, Manual Second)
- Park or Neutral - Engine Running (Park)
- Fluid Passages
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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.