GM Service Manual Online
For 1990-2009 cars only

On-Vehicle Repair Matrix

Symptom

Possible Cause

No Move or Slip In Drive

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

No Move or Slip In Reverse

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

Slip On Acceleration

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

Time Lag Shifting from Neutral to Drive

    • Input Speed Sensor
    • Timing Solenoid Circuit
    • PCS Circuit
    • TCM
    • Lack of ATF, Burnt Smell of ATF
    • Water Mix, Wrong ATF
    • Valve Body
    • Transaxle Internal Parts

Time Lag Shifting from Neutral to Reverse

    • Input Speed Sensor
    • PCS Circuit
    • TCM
    • Lack of ATF, Burnt Smell of ATF
    • Water Mix, Wrong ATF
    • Valve Body
    • Transaxle Internal Parts

No Engine Start

    • PNP Switch
    • Shift Cable or PNP Misadjustment

Engine Stalls Shifting from Neutral to Drive or Neutral to Reverse

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

Engine Stalls from Slow Down

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

Poor Acceleration

    • Engine Malfunction
    • CAN Communication
    • Valve Body
    • Transaxle Internal Parts

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

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

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

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

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

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

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

    • Lock Up Solenoid Circuit
    • Brake Switch
    • TCM
    • Throttle Opening Signal
    • Valve Body
    • Transaxle Internal Parts

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

    • Shift Solenoid No. 1 Circuit
    • TCM
    • Valve Body
    • Transaxle Internal Parts

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

    • Shift Solenoid No. 1 Circuit
    • Shift Solenoid No. 2 Circuit
    • TCM
    • Valve Body
    • Transaxle Internal Parts

No Kick Down

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

Erratic Shift

    • Output Speed Sensor
    • PNP Switch
    • PCS Circuit
    • TCM
    • Throttle Opening Signal
    • Valve Body

Erratic Fuel Efficiency

    • Engine Malfunction
    • PCS Circuit
    • Brake Switch
    • TCM
    • Throttle Opening Signal
    • Valve Body
    • Transaxle Internal Parts

No Mode Select

    • Hold Mode Switch
    • TCM

Shift Lever Hard/Weak

    • Shift Cable or PNP Misadjustment
    • Transaxle Internal Parts

Oil Leak from Breather

    • Oil Cooler Pipe
    • Lack of ATF, Burnt Smell of ATF
    • Water Mix, Wrong ATF
    • Transaxle Internal Parts

Oil Leak Between E/G and T/A Housing

    • Oil Seal
    • O-Ring
    • 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

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

Harsh Shift From Neutral to Reverse

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

Harsh Shift During Shift Up

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

Harsh Shift During Coast Down

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

Harsh Shift During Kick Down

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

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

    • Engine Malfunction
    • E/G and A/T Mounting
    • Drive Shaft
    • Suspension Malfunction

Vibration While Idling

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

Vibration While Driving

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

Noise While Idling

    • Engine Malfunction
    • Oil Cooler Pipe Mis-installed, Damaged
    • Lack of ATF, Burnt Smell of ATF

Noise During Garage Shift

    • E/G and A/T Mounting
    • Drive Shaft

Noise While Driving

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

Noise During Up Shift or Down Shift

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

Noise While Acceleration On or Off

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