GM Service Manual Online
For 1990-2009 cars only

On-Vehicle Repair Matrix

Symptom

Possible Cause

No Move or Slip In Drive

    â€¢ Drive Plate Runout
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Lack of ATF, Burnt smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Torque Converter
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Move or Slip In Reverse

    â€¢ Drive Plate Runout
    â€¢ Timing Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Lack of ATF, Burnt smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Torque Converter
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Slip On Acceleration

    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ Timing Solenoid Circuit
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Lack of ATF, Burnt smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Torque Converter
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Time Lag Shifting from Neutral to Drive

    â€¢ Input Speed Sensor
    â€¢ Timing Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Lack of ATF, Burnt smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Time Lag Shifting from Neutral to Reverse

    â€¢ Input Speed Sensor
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Lack of ATF, Burnt smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Engine Start

    â€¢ PNP Switch
    â€¢ Shift Cable or PNP Misadjustment

Engine Stalls Shifting from Neutral to Drive or Neutral to Reverse

    â€¢ Engine Malfunction
    â€¢ Timing Solenoid Circuit
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Oil Cooler Pipe
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Engine Stalls from Slow Down

    â€¢ Engine Malfunction
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Oil Cooler Pipe
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Poor Acceleration

    â€¢ Engine Malfunction
    â€¢ CAN Communication
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from 1st to 2nd Gear or 2nd to 1st Gear

    â€¢ PNP Switch
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from 2nd to 3rd Gear or 3rd to 2nd Gear

    â€¢ PNP Switch
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from 3rd to 4th Gear or 4th to 3rd Gear

    â€¢ PNP Switch
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from No Lock Up On or No Lock Up Off

    â€¢ Lock Up Solenoid Circuit
    â€¢ Brake Switch
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from 2nd Engine Braking

    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ TCM
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Up Shift or No Down Shift from 1st Engine Braking

    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ TCM
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Kick Down

    â€¢ Output Speed Sensor
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ Timing Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Throttle Opening Signal

Erratic Shift

    â€¢ Output Speed Sensor
    â€¢ PNP Switch
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body

Erratic Fuel Efficiency

    â€¢ Engine Malfunction
    â€¢ PCS Circuit
    â€¢ Brake Switch
    â€¢ TCM
    â€¢ Throttle Opening Signal
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

No Mode Select

    â€¢ Hold Mode Switch
    â€¢ TCM

Shift Lever Hard/Weak

    â€¢ Shift Cable or PNP Misadjustment
    â€¢ Transaxle Internal Parts

Oil Leak from Breather

    â€¢ Oil Cooler Pipe
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Transaxle Internal Parts

Oil Leak Between E/G and T/A Housing

    â€¢ Oil Seal
    â€¢ O-Ring
    â€¢ Torque Converter

Oil Leak from Differential Oil Seal

Oil Seal

Oil Leak from Manual Shaft Oil Seal

Oil Seal

Oil Leak from T/A Housing, Oil Pan Rear Case, T/A Case

FIPG, Gasket

Oil Leak from O-Ring--Sensor, T/M Wire

O-Ring

Oil Leak from Oil Cooler Pipe

Oil Cooler Pipe Resonance

Harsh Shift From Neutral to Drive

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft
    â€¢ Suspension Malfunction
    â€¢ Input Speed Sensor
    â€¢ PNP Switch
    â€¢ TFT Sensor
    â€¢ Timing Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Engine Water Temperature Signal
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Harsh Shift From Neutral to Reverse

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Suspension Malfunction
    â€¢ Input Speed Sensor
    â€¢ PNP Switch
    â€¢ TFT Sensor
    â€¢ Timing Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Engine Water Temperature Signal
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Harsh Shift During Shift Up

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft
    â€¢ Suspension Malfunction
    â€¢ Input Speed Sensor
    â€¢ TFT Sensor
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ Timing Solenoid Circuit
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Engine Water Temperature Signal
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Harsh Shift During Coast Down

    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft
    â€¢ Suspension Malfunction
    â€¢ Input Speed Sensor
    â€¢ TFT Sensor
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ Timing Solenoid Circuit
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Engine Water Temperature Signal
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Harsh Shift During Kick Down

    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft
    â€¢ Suspension Malfunction
    â€¢ Input Speed Sensor
    â€¢ TFT Sensor
    â€¢ Shift Solenoid No. 1 Circuit
    â€¢ Shift Solenoid No. 2 Circuit
    â€¢ Timing Solenoid Circuit
    â€¢ Lock Up Solenoid Circuit
    â€¢ PCS Circuit
    â€¢ TCM
    â€¢ Engine Torque Signal
    â€¢ Engine Water Temperature Signal
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Water Mix, Wrong ATF
    â€¢ Valve Body
    â€¢ Transaxle Internal Parts

Harsh Shift During Acceleration On, Off--No Up, Down Shift

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft
    â€¢ Suspension Malfunction

Vibration While Idling

    â€¢ Engine Malfunction
    â€¢ Drive Plate Runout
    â€¢ E/G and A/T Mounting
    â€¢ Exhaust Pipe Resonance
    â€¢ Drive Shaft
    â€¢ Interference with Drive Train and Body
    â€¢ Suspension Malfunction

Vibration While Driving

    â€¢ Engine Malfunction
    â€¢ Drive Plate Runout
    â€¢ E/G and A/T Mounting
    â€¢ Exhaust Pipe Resonance
    â€¢ Drive Shaft
    â€¢ Tire Unbalance
    â€¢ Interference with Drive Train and Body
    â€¢ Suspension Malfunction
    â€¢ Lack of ATF, Burnt Smell of ATF
    â€¢ Transaxle Internal Parts

Noise While Idling

    â€¢ Engine Malfunction
    â€¢ Oil Cooler Pipe Mis-installed, Damaged
    â€¢ Lack of ATF, Burnt Smell of ATF

Noise During Garage Shift

    â€¢ E/G and A/T Mounting
    â€¢ Drive Shaft

Noise While Driving

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Exhaust Pipe Resonance
    â€¢ Drive Shaft
    â€¢ Tire Unbalance
    â€¢ Interference with Drive Train and Body
    â€¢ Suspension Malfunction

Noise During Up Shift or Down Shift

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Exhaust Pipe Resonance
    â€¢ Tire Unbalance
    â€¢ Interference with Drive Train and Body
    â€¢ Suspension Malfunction

Noise While Acceleration On or Off

    â€¢ Engine Malfunction
    â€¢ E/G and A/T Mounting
    â€¢ Exhaust Pipe Resonance
    â€¢ Tire Unbalance
    â€¢ Interference with Drive Train and Body
    â€¢ Suspension Malfunction