Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 Buick Roadmaster BaseFACTORY OEM SERVICE PROCEDURE
Code 24 - Vehicle Speed Sensor: Notes
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Code 24 will set if VSS signal circuit voltage is constant, engine speed is 1200-4400 RPM, TPS indicates throttle near idle position, transmission not in Park or Neutral and all conditions met for at least 4 seconds.
- A voltage of less than one volt at instrument panel connector indicates VSS signal circuit wire may be shorted to ground. Disconnect signal wire at VSS buffer. If voltage remains less than 10 volts, circuit is shorted to ground or open. If circuit is not open or shorted to ground, check for poor control module connection and faulty control module.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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