For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Incorrect Torque Converter Clutch Apply or Release

Incorrect Torque Converter Clutch Apply or Release for GMC Truck GMC P42 Commercial Chassis 1999

Incorrect TCC Apply or Release

Checks

Cause

AT Output (Shaft) Speed Sensor Assembly (22)

•	Poor connection

•	Pinched wire

•	A broken coil wire

•	Incorrect air gap

•	Inadequate signal

Throttle Position Sensor

•	Poor connection

•	Pinched wire

•	Incorrect resistance

VCM/PCM

Failed

Automatic Transmission Fluid Pressure Manual Valve Position Switch (40)

•	Poor Connection

•	No signal to the VCM/PCM

•	Pinched wire

AT Fluid Temperature Sensor Assembly (332)

•	Poor Connection

•	No signal to the VCM/PCM

•	Incorrect Resistance

•	Pinched wire

Engine Coolant

No signal to the VCM/PCM

Brake Switch

•	Poor connection

•	Pinched wire

•	No voltage supply

•	Misadjusted

Engine Ignition Module

Loss of signal or intermittent

Check the VCM/PCM for current DTCs

Only 2WD

Digital Ratio Adapter (DRAC)

•	Malfunction

•

Incorrect