The OBD code P0791 for Toyota indicates a problem with the Speed Sensor NC circuit in the transmission.
Symptoms include the Engine Light being ON.
This issue can be caused by a faulty speed sensor, wiring harness issues, or a malfunctioning Engine Control Module.
It is a moderate concern that should be addressed promptly.
To fix it, inspect the speed sensor and related wiring for any faults or damage.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the Toyota p0791 OBD Code
The vehicle may experience trouble shifting gears or slipping in higher gears with fault code P0791.
- Symptoms: Engine Light ON.
- Possible harsh shifting from the transmission.
- Difficulty shifting gears.
- Possible decrease in fuel efficiency.
Causes of the Toyota p0791 OBD Code
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P0791 in a Toyota typically indicates a problem with the intermediate shaft speed sensor circuit.
- P0791 can be caused by a faulty Speed sensor NC (Transmission Revolution Sensor).
- A Speed sensor NC harness that is open or shorted.
- A Speed sensor NC circuit with poor electrical connection.
- Or a faulty Engine Control Module (ECM).
Fixing Toyota Error Code p0791 Step By Step
Addressing fault code P0791 in a Toyota involves diagnosing and repairing issues with the intermediate shaft speed sensor circuit.
- To fix Toyota OBDII code P0791, first, review the possible causes related to the transmission pressure control solenoid C circuit performance.
- Visually inspect the wiring harness and connectors associated with the transmission pressure control solenoid C for any signs of damage or corrosion.
- Check the connector pins for any issues like being broken, bent, pushed out, or corroded.
- Test the resistance of the transmission pressure control solenoid C and replace it if necessary.
- Clear the fault codes and perform a test drive to ensure the issue is resolved.
Cost Of Fixing Toyota p0791 Fault Code
The repair for fault code P0791 in a Toyota involves diagnosing and fixing issues with the transmission.
The cost to diagnose and fix a Toyota OBD code P0791 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and complexity can affect the final cost.
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Details of the Toyota p0791 OBD Code
Code P0791 in Toyota indicates an issue with the Intermediate Shaft Speed Sensor Circuit Range/Performance.
OBD code P0791 for Toyota vehicles indicates a problem with the Intermediate Shaft Speed Sensor Circuit.
This code is triggered by the Engine Control Module (ECM) when it detects an incorrect input signal from the intermediate shaft speed sensor.
The intermediate shaft speed sensor is part of the transmission system and is responsible for monitoring the speed of the intermediate shaft.
When the ECM receives a signal that is outside the expected range, it triggers the P0791 fault code.
This code is specific to transmissionrelated issues and should be diagnosed and repaired by a qualified technician familiar with Toyota vehicles.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing fault code P0791 in Toyota vehicles.
To diagnose and fix OBDII code P0791 in a Toyota, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Additionally, visually inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address potential issues causing the P0791 code.
FAQ
Common symptoms of OBD code P0791 in a Toyota: Engine Light ON, possible causes include faulty speed sensor NC, harness issues, or ECM problems. Inspect and repair as needed.
OBD code P0791 in a Toyota is typically caused by a faulty Speed sensor NC (Transmission Revolution Sensor) or related wiring issues. Inspect and repair as needed.
Diagnose and repair OBD code P0791 in a Toyota: Symptoms Engine Light ON; Causes Faulty Speed sensor NC, harness issues; Fix Inspect wiring, connectors for damage.
Wrap Up
If your Toyota is displaying OBDII code P0791, you may experience harsh shifting, transmission slippage, or decreased fuel efficiency.
This code typically indicates an issue with the Intermediate Shaft Speed Sensor Circuit, possibly due to a faulty sensor, damaged wiring, or poor connections.
To address Toyota OBDII code P0791, start by inspecting the wiring harness and connectors related to the Intermediate Shaft Speed Sensor.
Check for any signs of damage, corrosion, or loose connections.
If no issues are found, consider replacing the Intermediate Shaft Speed Sensor to resolve the problem effectively.
