Second Gear Start. GMC Truck Canyon Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2008 🢒 Canyon Pickup - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E/4L70-E 🢒 Second Gear Start

Checks

Causes

Signal Noise on Vehicle Speed Sensor (VSS) Circuit

Chassis vibrations, incorrect harness routing, owner installed electronic components creating electrical interference.

Diagnostic Trouble Code (DTC)

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

•	Sediment in the valve body may cause improper transmission fluid pressure (TFP) operation.

Leaking Actuator Feed Limit (AFL) Circuit

Spacer plate (48), spacer plate gaskets (47 or 52), control valve body (60), mispositioned, damaged or poor sealing/mating surface exist.

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.