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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Diagnostic Flow Charts (Cars) >> Code 24, Vehicle Speed Sensor (A, F, J, L, N, W & Y Bodies) >> Diagnostic Aids

Diagnostic Aids

A faulty or misadjusted park/neutral switch may set a false Code 24. Use "Scan" tester and check for proper signal in Drive, while wiggling shifter. Code 24 may set if vehicle is power braked (brakes applied and throttle depressed) for more than 10 seconds.

Fig 1: Code 24 Troubleshooting Diagram (A, F, J, L, N, W & Y Bodies)
G92F13701Courtesy of GENERAL MOTORS CORP.
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