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
READ NEXT:
Gear Selector -N- Position Learn
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosi
Connector Reconnection - Automatic Transmission
Special Tools
EL-35616 Terminal Test Probe Kit
For equivalent regional tools, refer to Special Tools.
When the condition is not currently present, but is indicated in DTC history,
the cause may be in
SEE MORE:
DTC B1446 or B1447 (IOB/IO5/IO6)
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descripto
Symptoms - Seat Belts
NOTE: Review the seat belt system description and operation in order to
familiarize yourself with the system and how it functions.
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the
seat belt system. Refer to Checking Aftermarket Accessories.
Insp
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