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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 - 1991 Diesel >> Diagnostic Aids

Diagnostic Aids

With drive wheels turning, Scan tester and speedometer reading should closely match.

Fig 1: Code 24, VSS Troubleshooting Chart (Diesel)

G91C13633

Courtesy of GENERAL MOTORS CORP.

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