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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Diagnostic Code Charts (Trucks) >> Code 24, Vehicle Speed Sensor - 4WD With 4L80-E Transmission >> Diagnostic Aids

Diagnostic Aids

Check all connections, especially those at the transmission pass-through connector. While Code 24 is set, Scan tester will display an RPM derived from input speed. If input speed is not operational at start-up, this can cause VSS to read zero.

Fig 1: Code 24, VSS Troubleshooting Chart (4WD With 4L80-E Transmission)
G91F13669Courtesy of GENERAL MOTORS CORP.
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