GM Service Manual Online
For 1990-2009 cars only

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.

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.