P0791 2016 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 2016 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.
Code P0791 2016 Toyota RAV4 Description
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.
What are the Possible Causes of the DTC P0791 2016 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 2016 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 2016 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.
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Frequently Asked Questions about P0791 2016 Toyota RAV4 Code
1. What does the OBDII code P0791 mean on a 2016 Toyota RAV4?
P0791 indicates an issue with the Intermediate Shaft Speed Sensor 'A' Circuit, which monitors the rotational speed of the intermediate shaft in the transmission.
2. What are the common symptoms of a P0791 code in a 2016 Toyota RAV4?
Symptoms may include erratic or delayed shifting, the transmission going into limp mode, poor fuel efficiency, or the check engine light being illuminated.
3. What causes the P0791 code to appear on a 2016 Toyota RAV4?
Common causes include a faulty intermediate shaft speed sensor, damaged wiring or connectors in the sensor circuit, or issues with the transmission control module (TCM).
4. Can I drive my 2016 Toyota RAV4 with a P0791 code?
While the vehicle may still be drivable, driving with this code can lead to transmission damage or unsafe driving conditions. It is recommended to address the issue promptly.
5. How do I diagnose the P0791 code on a 2016 Toyota RAV4?
Start by checking the intermediate shaft speed sensor and its wiring for damage or disconnections. Use a multimeter to test the sensor's resistance and verify the circuit's continuity. A scan tool may also be needed to read live transmission data.
6. How do I fix the P0791 code on my 2016 Toyota RAV4?
Repairs may include replacing the faulty intermediate shaft speed sensor, repairing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.
7. How much does it cost to fix the P0791 code on a 2016 Toyota RAV4?
Repair costs can vary. Replacing the intermediate shaft speed sensor typically costs between $150 and $300, including parts and labor, depending on your location and mechanic.
8. Can a dirty transmission fluid cause a P0791 code in a 2016 Toyota RAV4?
Yes, contaminated or low transmission fluid can affect the sensor's performance. Checking and replacing the fluid may help resolve the issue.
9. Do I need to reprogram the transmission control module if I get a P0791 code?
Reprogramming the TCM is typically only necessary if there is a software-related issue, or after replacing the TCM. A technician can determine if this step is required.
10. Is the P0791 code a common issue for the 2016 Toyota RAV4?
While not extremely common, this code can occur, especially as the vehicle ages or if the transmission experiences wear and tear. Regular maintenance can help prevent related issues.
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