Buick Regal Owners & Service Manuals

Buick Regal: Harsh Garage Shift

"N" to "D"

  • ATF Level/Condition
  • TCM
  • Shift Cable Adjustment
  • Valve Body

"N" to "R"

  • ATF Level/Condition
  • TCM
  • Shift Cable Adjustment
  • Valve Body

ERRATIC SHIFT

Erratic Shifting

  • Output Speed Sensor (NOUT)
  • TCM

SLIPS IN DRIVE OR NO DRIVE

No Move or Slip in "D"

  • ATF Level/Condition
  • TCM
  • Shift Cable Adjustment
  • Torque Converter
  • Valve Body
  • Forward Clutch Pressure Control Solenoid (Gears 1-2-3-4-5) (SL1)

No Move or Slip in "R"

  • ATF Level/Condition
  • Shift Solenoid 1 (S1)
  • Shift Solenoid 2 (S2)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • TCM
  • Shift Cable Adjustment
  • Torque Converter
  • Valve Body

Slip On Acceleration

  • ATF Level/Condition
  • Engine Malfunction
  • Line Pressure Control Solenoid (SLT)
  • TCM
  • Shift Cable Adjustment
  • Torque Converter
  • Valve Body

NO UPSHIFT OR DOWNSHIFT

1st to 2nd or 2nd to 1st

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Shift Solenoid 1 (S1)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)

2nd to 3rd or 3rd to 2nd

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Shift Solenoid 1 (S1)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)

3rd to 4th or 4th to 3rd

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Shift Solenoid 1 (S1)
  • Direct Clutch Pressure Control Solenoid (Gears 5-6-7-8) (SL2)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • Shift Solenoid 2 (S2)

4th to 5th or 5th to 4th

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (SL1)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)

5th to 6th or 6th to 5th

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (SL1)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)

6th to 7th or 7th to 6th

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (SL1)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)

7th to 8th or 8th to 7th

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Engine Malfunction
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (SL1)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • Direct Clutch Pressure Control Solenoid (Gears 5-6-7-8) (SL2)
  • Forward Band Solenoid (Gears 2-8) (SL5)

No Torque Converter Lock-up ON or OFF

  • ATF Level/Condition
  • Valve Body
  • TCM
  • Torque Converter Lock-up Control Solenoid (SLU)
  • Battery Voltage Low
  • Output Speed Sensor (NOUT)
  • Input Speed Sensor (NIN)
  • Oil Temperature Sensor (OT)

No 1st Gear Engine Braking

  • Fluid Level Low
  • Valve Body
  • TCM
  • Shift Solenoid 1 (S1)
  • Shift Solenoid 2 (S2)
  • Battery Voltage Low

No Kickdown

  • TCM

NO MANUAL SHIFT

No Manual Shifting

  • TCM

NO ENGINE START

No Engine Start

  • Engine Malfunction
  • Battery Voltage Low
  • TCM
  • Shift Cable Adjustment

ENGINE STALLS WHEN SHIFTING FROM NEUTRAL TO DRIVE OR REVERSE

"N" to "D"

  • Engine Malfunction
  • Torque Converter Lock-up Control Solenoid (SLU)
  • TCM
  • Torque Converter
  • Valve Body

"N" to "R"

  • Engine Malfunction
  • Torque Converter Lock-up Control Solenoid (SLU)
  • TCM
  • Torque Converter
  • Valve Body

Deceleration

  • Engine Malfunction
  • Torque Converter Lock-up Control Solenoid (SLU)
  • TCM
  • Torque Converter
  • Valve Body

HARSH SHIFTS

"N" to "D"

  • Battery Voltage Low
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (Gears 1-2-3-4-5) (SL1)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • TCM
  • ATF Level/Condition
  • Valve Body

"N" to "R"

  • Battery Voltage Low
  • Oil Temperature Sensor (OT)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • TCM
  • ATF Level/Condition
  • Valve Body

Up-Shift

  • Battery Voltage Low
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (Gears 1-2-3-4-5) (SL1)
  • Direct Clutch Pressure Control Solenoid (Gears 5-6-7-8) (SL2)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • TCM
  • ATF Level/Condition
  • Valve Body

Down-Shift

  • Battery Voltage Low
  • Oil Temperature Sensor (OT)
  • Line Pressure Control Solenoid (SLT)
  • Forward Clutch Pressure Control Solenoid (Gears 1-2-3-4-5) (SL1)
  • Direct Clutch Pressure Control Solenoid (Gears 5-6-7-8) (SL2)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • TCM
  • ATF Level/Condition
  • Valve Body

Kick Down

  • Battery Voltage Low
  • Oil Temperature Sensor (OT)
  • Forward Clutch Pressure Control Solenoid (Gears 1-2-3-4-5) (SL1)
  • Direct Clutch Pressure Control Solenoid (Gears 5-6-7-8) (SL2)
  • 3rd Clutch Pressure Control Solenoid (Gears 3-7-R) (SL3)
  • 3rd Clutch Pressure Control Solenoid (Gears 4-6) (SL4)
  • TCM
  • ATF Level/Condition
  • Valve Body

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