Second Gear Start. GMC Truck Envoy

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2006 🢒 Envoy - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E/4L70-E 🢒 Second Gear Start

Checks

Causes

Diagnostic Trouble Code (DTC)

•	Electrical or mechanical 1-2 Shift Solenoid Valve (367) malfunction.

•	Sediment in the valve body may cause improper TFP operation.

Vehicle Speed Sensor (36) Signal

•	Inaccurate VSS signal or signal interference.

•	Drive line vibration or disturbance.

Blocked or restricted Valve Body Spacer Plate (48) Spacer Plate to Case Gasket (47) or Spacer Plate to Valve Body Gasket (52)

Trapped sediment or metal particles.

Stuck 1-2 Shift Valve (366)

•	Trapped sediment or metal particles.

•	Binding shift valve or worn valve body bore.

TFP manual valve position switch (69)

TFP manual valve position switch (69) erratic operation.