P1791 Acura 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 Acura 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 Acura Description
What are the Possible Causes of the DTC P1791 Acura?
- 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 Acura?
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 Acura 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.
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Frequently Asked Questions about P1791 Acura Code
1. What does the OBDII code P1791 mean on an Acura?
P1791 indicates a Vehicle Speed Sensor (VSS) Range/Performance Problem, meaning the sensor is not providing accurate or expected speed data to the vehicle's control module.
2. What are the common symptoms of the P1791 code?
Symptoms may include erratic speedometer readings, poor acceleration, abnormal shifting, reduced fuel efficiency, or the illumination of the check engine light.
3. What causes the P1791 code to appear?
The code can be caused by a faulty vehicle speed sensor, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or debris interfering with the sensor.
4. Can I drive my Acura with the P1791 code?
Driving with the P1791 code is not recommended, as it can lead to unsafe driving conditions due to erratic shifting or speedometer issues.
5. How do I diagnose the P1791 code on my Acura?
Diagnose the code by inspecting the VSS wiring and connectors for damage, testing the sensor for proper operation, and verifying the transmission fluid level and condition.
6. How do I fix the P1791 code?
Repairs may include replacing a faulty vehicle speed sensor, repairing damaged wiring, cleaning debris from the sensor area, or reprogramming or replacing the TCM if necessary.
7. How much does it cost to fix the P1791 code?
The cost can range from $100 to $300 for a VSS replacement, depending on the model and labor rates. Additional repairs, such as wiring or TCM replacement, may increase costs.
8. Can low transmission fluid cause the P1791 code?
Yes, low or dirty transmission fluid can cause improper sensor readings and lead to the P1791 code.
9. Do I need to clear the P1791 code after repairs?
Yes, after completing repairs, you should clear the code with an OBDII scanner and test drive the vehicle to ensure the issue is resolved.
10. Can a failing speedometer trigger the P1791 code?
Yes, a malfunctioning speedometer may indicate a problem with the vehicle speed sensor, which can trigger the P1791 code.
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