Diagnostic Aids

1995 Chevrolet Sportvan G20, 6.5 PSECTION Diagnostic Aids

Check for deformed connectors at pass-thru connector. DTC 68 will set when going to default (2nd gear). An intermittent incorrect engine speed signal will set a DTC 68 if incorrect signal lasts for greater than 2 seconds. A mechanical failure in 1-2 shift solenoid (stuck off) or 2-3 shift solenoid (stuck on) could set DTC 68.

Fig 1: DTC 68 Schematic (4L80-E) Transmission Component Slipping
G95I27399
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.