The automobile fault code P0791 indicates a problem with the speed sensor NC in the transmission.
This can cause the engine light to turn on or the service engine soon warning light to illuminate.
The possible causes include a faulty speed sensor NC, an open or shorted speed sensor NC harness, a poor electrical connection in the speed sensor NC circuit, or a faulty Engine Control Module (ECM). To fix this issue, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion.
Additionally, look for any broken, bent, pushed out, or corroded pins in the connectors. The repair time for this issue is estimated to be around 1.0 hour.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
P0791 Fault Code Symptoms: Unveiling The Telltale Signs Of Trouble
When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p0791 fault code.
- The symptoms of the automobile fault code P0791 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.
Unveiling The Culprits: Decoding The Causes Of Code P0791
The automobile fault code P0791 can be caused by a faulty speed sensor NC, an open or shorted speed sensor NC harness, a poor electrical connection in the speed sensor NC circuit, or a faulty Engine Control Module (ECM).
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- The fault code P0791 can be caused by: a faulty speed sensor NC (Transmission Revolution Sensor), an open or shorted speed sensor NC harness, a poor electrical connection in the speed sensor NC circuit, or a faulty Engine Control Module (ECM).
Fixing Code P0791: A Step-By-Step Guide To Resolve Transmission Pressure Control Solenoid C Circuit Performance
To fix the automobile fault code p0791, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.
- To fix the automobile fault code P0791, start by checking the possible causes mentioned above.
- Then, visually inspect the wiring harness and connectors related to the issue.
- Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.
- This fix is estimated to take approximately 1.0 hour.
Cracking The Code: P0791 – Cost And Complexity Unveiled!
The automobile fault code P0791 can be diagnosed and fixed within an estimated repair time of 1.0 hour.
Auto repair shops typically charge between $75 and $150 per hour for their services.
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P0791: Transmission Intermediate Shaft Speed Sensor Circuit Performance
The P0791 fault code refers to the Intermediate Shaft Speed Sensor ‘A’ Circuit.
This sensor is responsible for detecting the rotation speed of the counter gear, which indicates the output speed of the transaxle. It helps the Engine Control Module (ECM) determine the shift timing of the gears and control the engine torque and hydraulic pressure accordingly. This ensures smooth gear shifts. The ECM detects the fault when the vehicle is operating in 2nd, 3rd, 4th, or 5th gear with the shift lever in D, and the input shaft speed is less than 300 rpm while the output shaft speed is more than 1000 rpm.
When this happens, the ECM illuminates the MIL (Malfunction Indicator Lamp) and stores the Diagnostic Trouble Code (DTC) P0791. The P0791 code is triggered when the input speed sensor voltage is either more than 1.9V or less than 0.1V for 2 seconds or more. This indicates a problem with the Intermediate Shaft Speed Sensor ‘A’ Circuit.
It is important to address this issue promptly to ensure proper functioning of the transaxle and avoid further damage.
FAQ
If you’re seeing the engine light on or the service engine soon warning light, the fault code P0791 might be the culprit. This code is often caused by a faulty speed sensor NC (Transmission Revolution Sensor), an open or shorted speed sensor NC harness, a poor electrical connection in the speed sensor NC circuit, or a faulty Engine Control Module (ECM). To fix this issue, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.
To fix the P0791 fault code, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors. This can help identify any issues with the speed sensor NC or poor electrical connections. Don’t forget to also check the other possible causes listed, such as a faulty engine control module.
When resolving the P0791 fault code, start by checking for damaged components and connector pins. Visually inspect the related wiring harness and connectors, looking for any signs of damage such as broken, bent, pushed out, or corroded connector pins. This can help identify any issues with the speed sensor NC or its circuit. Additionally, check for any open or shorted circuits in the speed sensor NC harness and ensure there is a good electrical connection. Finally, don’t forget to also consider the possibility of a faulty Engine Control Module (ECM).
Wrap Up
If you’re seeing the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Speed sensor NC (Transmission Revolution Sensor), an open or shorted speed sensor NC harness, a poor electrical connection in the speed sensor NC circuit, or a faulty Engine Control Module (ECM). To fix this, visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins.
