P1791 Code - Vehicle Speed Sensor Range/Performance Problem
Quick Answer
The Vehicle Speed Sensor (VSS) is driven by the differential. Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1791 indicates Vehicle Speed Sensor Range/Performance Problem.
- Common causes
- Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1791 Description
What are the Possible Causes of the DTC P1791?
- Faulty Vehicle Speed Sensor
- Vehicle Speed Sensor harness is open or shorted
- Vehicle Speed Sensor circuit poor electrical connection
How to Fix the DTC P1791?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1791 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1791 code?
Need more information on how to fix the P1791 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1791 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1791 Acura — Vehicle Speed Sensor Range/Performance Problem
- P1791 Buick — Transmission Control Module Loop
- P1791 Cadillac — Transmission Control Module Loop
- P1791 Chevrolet — Transmission Control Module Loop
- P1791 GMC — Transmission Control Module Loop
- P1791 Honda — Vehicle Speed Sensor Range/Performance Problem
- P1791 Hyundai — TPS Input Circuit Malfunction
- P1791 Isuzu — Vehicle Speed Sensor Range/Performance Problem
Frequently Asked Questions about P1791 Code
No Frequently Asked Questions about P1791 Code found.
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