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.
Code 24 - VSS Circuit: Notes
The ECM provides battery voltage to the Vehicle Speed Sensor (VSS), located behind instrument panel. The VSS alternately grounds circuit No. 437, which toggles the voltage high and low. This pulsed signal is used by the ECM to determine vehicle speed.
- Code 24 sets if vehicle speed equals 0 MPH when:
- Engine speed is between 1500-4400 RPM.
- TPS is at zero percent (closed throttle).
- MAP reads low voltage with high vacuum (low load condition).
- Transaxle not in Park or Neutral.
- Speed sensor indicates speeds less than 5 MPH.
- All conditions are met for 3 seconds.
These conditions are met during a road load deceleration. Disregard Code 24 that sets when drive wheels are not operating.
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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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