GM Service Manual Online
For 1990-2009 cars only

Loss of Power

Checks

Actions

O/D switch

Faulty switch

ATF temperature sensor

Refer to Diagnostic System Check - Vehicle.

Line pressure solenoid

Refer to Diagnostic System Check - Vehicle.

Shift solenoid

Refer to Diagnostic System Check - Vehicle.

Transmission control module (TCM)

Refer to Diagnostic System Check - Vehicle.

Oil pump

Damage or wear to the oil pump gears

Torque converter

Internal damage

Control valve spool sliding

Damage to the control valve spool

High clutch

Burn or wear of the high clutch. Refer to High Clutch Disassemble

2-4 brake band

Burnt or worn 2-4 brake band