Test Description

Download the full database via torrent (~1.1 TB) | Download Brad's custom LEMON patches

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks indicated range signal to valve position signal actually selected.
Checks for correct voltage from PCM to transmission external connector.
Checks for short to ground in any one of the 3 valve position circuits.

Fig 1: Code 28 Schematic (Corvette) Transmission Range Pressure Switch

G95J14026

Fig 2: Code 28 Diagnostic Flow Chart (Corvette) Transmission Range Pressure Switch

G95E14021