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P1791 Acura Code - Vehicle Speed Sensor Range/Performance Problem

Quick Answer

The P1791 code for Acura vehicles indicates a Vehicle Speed Sensor Range/Performance Problem. Common causes include Faulty vehicle speed sensor, Damaged wiring or connectors, Malfunctioning engine control module. 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, Damaged wiring or connectors, Malfunctioning engine control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1791 Acura Description

The P1791 code for Acura vehicles indicates a Vehicle Speed Sensor Range/Performance Problem. This means that the vehicle's onboard computer has detected an issue with the vehicle speed sensor, which is responsible for monitoring the speed of the vehicle and sending this information to the engine control module. A malfunction in the vehicle speed sensor can lead to inaccurate speed readings, affecting the vehicle's performance and overall driving experience.

OBDII Code P1791 Acura - Vehicle Speed Sensor Range/Performance Problem
P1791 Acura Code - Vehicle Speed Sensor Range/Performance Problem

Common Causes of P1791 Acura

  1. Faulty vehicle speed sensor
  2. Damaged wiring or connectors
  3. Malfunctioning engine control module
  4. Transmission issues
  5. Poor electrical connections

Symptoms of P1791 Acura

  1. Inaccurate speedometer readings
  2. Harsh or delayed shifting
  3. ABS or traction control warning lights illuminated
  4. Cruise control not engaging
  5. Engine stalling or rough idling

How to Fix P1791 Acura

  1. Diagnose the issue by using a diagnostic scanner to retrieve the trouble codes and perform a visual inspection of the vehicle speed sensor and related components.
  2. Test the vehicle speed sensor using a multimeter to check for proper resistance and voltage readings.
  3. Replace the faulty vehicle speed sensor if it fails the tests, ensuring proper installation and connection.
  4. Check and repair any damaged wiring or connectors related to the vehicle speed sensor.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P1791 Acura

The typical repair costs for a Vehicle Speed Sensor Range/Performance Problem can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for repairs.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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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