P1791
Vehicle Speed Sensor Range/Performance Problem
P1791 is an OBD-II diagnostic trouble code meaning: Vehicle Speed Sensor Range/Performance Problem. Common causes: speed sensor (vss) malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $6–33.
Symptoms
- Incorrect speedometer readings
- Gear shifting problems
- Cruise control not working
- Check Engine Light Illuminates
- Increased fuel consumption
Causes
- Speed sensor (VSS) malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Damage to the sensor drive mechanism
- Problems with the ECU
How to Fix
- Check the integrity of the sensor wiring and connectors
- Test the speed sensor with a multimeter
- Check the sensor drive mechanism for damage
- Replace faulty speed sensor
- If necessary, diagnose the ECU
Related codes
Error P1791 by Vehicle Brand
FAQ
What does the P1791 code mean?
P1791 is an OBD-II diagnostic trouble code that indicates: Vehicle Speed Sensor Range/Performance Problem
What causes a P1791 error code?
The most common causes of P1791 include: Speed sensor (VSS) malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Damage to the sensor drive mechanism.
How do I fix a P1791 diagnostic trouble code?
To fix P1791: Check the integrity of the sensor wiring and connectors. Test the speed sensor with a multimeter. Check the sensor drive mechanism for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1791?
Limited driving only, diagnose soon
How much does it cost to fix P1791?
The estimated repair cost for P1791 is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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