What does code P0502 mean?
The VSS signal is low or absent, preventing proper speed detection by the ECU.
OBD-II Code
P0502 — Vehicle Speed Sensor Low Input
The VSS signal is low or absent, preventing proper speed detection by the ECU.
Common symptoms
- Speedometer reads zero
- transmission slipping
- inoperative odometer
Possible causes
- Signal wire shorted to ground
- dirty or failed VSS
Initial recommendation
Check wiring continuity and replace vehicle speed sensor if no signal is present.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0502 with your vehicle's actual symptoms for more complete diagnostic guidance.
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