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Engine-Codes – Generic – P0791

P0791 Code - Intermediate Shaft Speed Sensor 'A' Circuit

Quick Answer

The P0791 code indicates a problem with the Intermediate Shaft Speed Sensor 'A' Circuit in the vehicle. Common causes include Faulty intermediate shaft speed sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning transmission 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
P0791 indicates Intermediate Shaft Speed Sensor 'A' Circuit.
Common causes
Common causes include Faulty intermediate shaft speed sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning transmission 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 12, 2024
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Code P0791 Description

The P0791 code indicates a problem with the Intermediate Shaft Speed Sensor 'A' Circuit in the vehicle. This sensor is responsible for monitoring the speed of the intermediate shaft in the transmission. The information provided by this sensor is crucial for the transmission control module to determine the appropriate shift points and ensure smooth gear changes.

OBDII Code P0791 - Intermediate Shaft Speed Sensor 'A' Circuit
P0791 Code - Intermediate Shaft Speed Sensor 'A' Circuit

Common Causes of P0791

  1. Faulty intermediate shaft speed sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning transmission control module
  4. Electrical issues in the circuit
  5. Fluid contamination in the sensor

Symptoms of P0791

  1. Erratic shifting behavior
  2. Transmission slipping
  3. Harsh shifts
  4. Transmission going into limp mode
  5. Illumination of the Check Engine Light

How to Fix P0791

  1. Begin by diagnosing the specific cause of the issue using a scan tool to retrieve the trouble code and checking the wiring and connectors for any damage.
  2. If the intermediate shaft speed sensor is found to be faulty, replace it with a new sensor following the manufacturer's instructions.
  3. Repair any damaged wiring or connectors in the circuit and ensure proper connections.
  4. Clear the trouble code from the vehicle's computer and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any other underlying issues in the transmission system.

Cost to Fix P0791

The typical repair costs for addressing the P0791 code can range from $150 to $400, including parts and labor. However, it's important to note that prices can vary depending on the vehicle make and model, as well as the specific repair shop's labor rates. It's recommended to obtain a detailed estimate from a reputable repair shop in your area to get a more accurate cost assessment.

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Code P0791 Information for Specific Makes

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.

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