AutoCodes – Toyota – P0791 2018 Toyota RAV4

P0791 2018 Toyota RAV4 Code - Intermediate Shaft Speed Sensor 'A' Circuit

Quick Answer

This sensor detects the rotation speed of the counter gear which indicates the output speed of the transaxle. Common causes include Faulty Speed sensor NC (Transmission Revolution Sensor), Speed sensor NC harness is open or shorted, Speed sensor NC 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: P0791 2018 Toyota RAV4 indicates Intermediate Shaft Speed Sensor 'A' Circuit.
Common causes: Common causes include Faulty Speed sensor NC (Transmission Revolution Sensor), Speed sensor NC harness is open or shorted, Speed sensor NC 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.

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Code Popularity 491

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0791 2018 Toyota RAV4 Description

This sensor detects the rotation speed of the counter gear which indicates the output speed of the transaxle. By comparing the input turbine speed (speed sensor NT) signal with the counter gear speed (speed sensor NC) signal, the Engine Control Module (ECM) detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.
The NT terminal of the ECM detects a pulse signal from the speed sensor NT (input RPM). The ECM calculates gear shifts by comparing the signal from speed sensor NT with the signal from speed sensor NC.
While the vehicle is operating in 2nd, 3rd, 4th, or 5th gear with the shift lever in D, if the input shaft speed is less than 300 rpm although the output shaft speed is more than 1000 rpm, the ECM interprets this as a fault, illuminates the MIL and stores the Diagnostic Trouble Code (DTC). P0791 code is detected when the input speed sensor voltage is more than 1.9V or less than 0.1V for 2 seconds or more.

OBDII Code P0791 2018 Toyota RAV4 - Intermediate Shaft Speed Sensor 'A' Circuit - AutoCodes.com — P0791 2018 Toyota RAV4 Code - Intermediate Shaft Speed Sensor 'A' Circuit

What does this mean?

What are the Possible Causes of the DTC P0791 2018 Toyota RAV4?

Faulty Speed sensor NC (Transmission Revolution Sensor)
Speed sensor NC harness is open or shorted
Speed sensor NC circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0791 2018 Toyota RAV4?

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 P0791 2018 Toyota RAV4 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 P0791 2018 Toyota RAV4 code?

Need more information on how to fix the P0791 2018 Toyota RAV4 code? Get Access to Factory Service Manuals

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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 P0791 2018 Toyota RAV4 Code

1. What are the common symptoms of OBDII code P0791 in a 2018 Toyota RAV4?

The common symptoms of OBDII code P0791 in a 2018 Toyota RAV4 include issues with the vehicle's transmission, such as difficulty shifting gears, harsh shifting, or the transmission getting stuck in a particular gear.

2. What can cause OBDII code P0791 to trigger in a 2018 Toyota RAV4?

The triggering of OBDII code P0791 in a 2018 Toyota RAV4 is often caused by a faulty intermediate shaft speed sensor 'A', a damaged sensor circuit, or issues with the transmission control module.

3. How can I diagnose the cause of OBDII code P0791 in my 2018 Toyota RAV4?

To diagnose the cause of OBDII code P0791 in a 2018 Toyota RAV4, it is recommended to use a scan tool to read the fault codes, inspect the intermediate shaft speed sensor 'A' and its wiring for any damage, and perform a thorough transmission system check.

4. Can I continue driving my 2018 Toyota RAV4 with OBDII code P0791 present?

It is not recommended to continue driving your 2018 Toyota RAV4 with OBDII code P0791 present, as it can lead to further damage to the transmission system and potentially cause unsafe driving conditions.

5. How can I repair OBDII code P0791 in my 2018 Toyota RAV4?

Repairing OBDII code P0791 in a 2018 Toyota RAV4 involves replacing the faulty intermediate shaft speed sensor 'A', repairing any damaged wiring or connectors, and clearing the fault codes with a scan tool.

6. Is it possible to reset OBDII code P0791 in a 2018 Toyota RAV4 without fixing the underlying issue?

While you can clear the fault code temporarily by resetting the system, it is crucial to address the underlying issue causing OBDII code P0791 in a 2018 Toyota RAV4 to prevent the problem from recurring.

7. How much does it typically cost to repair OBDII code P0791 in a 2018 Toyota RAV4?

The cost to repair OBDII code P0791 in a 2018 Toyota RAV4 can vary depending on the extent of the damage and whether you perform the repair yourself or take the vehicle to a professional mechanic. Costs may include parts and labor.

8. Can a DIY enthusiast repair OBDII code P0791 in a 2018 Toyota RAV4?

A DIY enthusiast with the necessary tools and mechanical knowledge may be able to repair OBDII code P0791 in a 2018 Toyota RAV4 by following repair guides or tutorials specific to the intermediate shaft speed sensor 'A' circuit.

9. How long does it typically take to repair OBDII code P0791 in a 2018 Toyota RAV4?

The time needed to repair OBDII code P0791 in a 2018 Toyota RAV4 can vary depending on the complexity of the repair, the availability of parts, and the individual's experience. It may take a few hours to a day for the repair to be completed.

10. Will fixing OBDII code P0791 improve the performance of my 2018 Toyota RAV4?

Fixing OBDII code P0791 in a 2018 Toyota RAV4 can help restore proper transmission functionality, improve shifting performance, and prevent further damage to the vehicle's transmission system, ultimately enhancing the overall performance of the vehicle.