P1791 Honda 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 Honda 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 Honda Description
What are the Possible Causes of the DTC P1791 Honda?
- 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 Honda?
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 Honda 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 Honda code?
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Need Help with the Code?
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Information for Specific Honda Models
- P1791 1996 Honda Civic — Vehicle Speed Sensor Range/Performance Problem
- P1791 1997 Honda Civic — Vehicle Speed Sensor Range/Performance Problem
- P1791 1998 Honda Civic — Vehicle Speed Sensor Range/Performance Problem
- P1791 1999 Honda Civic — Vehicle Speed Sensor Range/Performance Problem
- P1791 2000 Honda Civic — Vehicle Speed Sensor Range/Performance Problem
Frequently Asked Questions about P1791 Honda Code
1. What does the OBDII code P1791 mean on a Honda?
P1791 indicates a "Vehicle Speed Sensor Range/Performance Problem," meaning the signal from the vehicle speed sensor is outside the expected range or not performing as it should.
2. What are common symptoms of the P1791 code in a Honda?
Symptoms may include erratic or non-functional speedometer, poor shifting performance, illuminated check engine light, and reduced fuel efficiency.
3. What causes the P1791 code to appear on a Honda?
Common causes include a faulty vehicle speed sensor, damaged or corroded wiring, loose connections, or issues with the transmission control module (TCM).
4. Can I still drive my Honda with the P1791 code?
While the car may still be drivable, it could experience shifting problems or unsafe driving conditions. It’s best to address the issue promptly.
5. How do I diagnose the P1791 code in my Honda?
Start by scanning for codes using an OBDII scanner, inspecting the vehicle speed sensor and its wiring, and testing the sensor's signal with a multimeter.
6. How do I fix the P1791 code on a Honda?
Common fixes include replacing the vehicle speed sensor, repairing damaged wiring or connectors, and, if necessary, reprogramming or replacing the TCM.
7. How much does it cost to repair the P1791 code on a Honda?
The cost varies depending on the issue. Replacing a speed sensor typically costs $100–$250, including parts and labor, while wiring repairs or TCM replacement may cost more.
8. Can a dirty or contaminated transmission fluid cause the P1791 code?
Yes, dirty or low transmission fluid can affect sensor performance and trigger this code. Check and replace the fluid if needed.
9. Will clearing the P1791 code with a scanner resolve the issue?
Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but the code will likely return.
10. Is the P1791 code specific to Honda vehicles?
No, the P1791 code can appear on other OBDII-compliant vehicles, but the diagnosis and repair process may vary depending on the make and model.
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