GM Service Manual Online
For 1990-2009 cars only

No Torque Converter Clutch (TCC) Apply

Checks

Causes

Lock-up solenoid

Refer to DTC 43 .

Engine speed sensor

Refer to DTC 22 .

ATF temperature sensor

Refer to DTC 17 .

Vehicle speed sensor

Refer to DTC 22 .

Turbine sensor

Refer ti DTC 15 .

Shift switch

Refer to DTC 55 .

Transmission control module (TCM)

Refer to Diagnostic System Check - Automatic Transmission .

Control valve spool

Control valve spool error

Torque converter

Internal failure