P1720
Vehicle Speed Meter Circuit Malfunction
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Speedometer doesn't work
- Incorrect speed readings on the dashboard
- Gear shifting problems (for automatic transmissions)
- Cruise control not working
- Check Engine light comes on
Causes
- Vehicle Speed Sensor (VSS) malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Wiring harness fault
- Dashboard problems
How to Fix
- Check the condition of the speed sensor and its connector
- Check the integrity of the wires in the sensor circuit
- Measure the speed sensor resistance
- Check the sensor signal using an oscilloscope
- If necessary, replace the speed sensor