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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnosis - 4L80-E >> Diagnostic Charts >> Code 24 - Output Speed Sensor Low (1991 2WD - "C" & "K" Series) >> Diagnostic Aids

Diagnostic Aids

Very carefully check the pass-through connector at transmission. If input sensor is not working at start-up, output sensor will read zero. If Code 24 is set in computer memory, "Scan" tool will read engine RPM (input sensor signal).

Fig 1: Code 24 Troubleshooting Flow Chart (1991 2WD - "C" & "K" Series)
G92F14097Courtesy of GENERAL MOTORS CORP.
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