P0791 Code - Intermediate Shaft Speed Sensor 'A' Circuit

What does P0791 Mean?

OBD-II Code Transmission may not shift properly is defined as a Intermediate Shaft Speed Sensor "A" Circuit

The Intermediate Shaft Speed Sensor tells the Transmission Control Module (TCM) how fast the intermediate shaft of the transmission is spinning so the correct gear can be engaged. When the TCM receives an inaccurate signal from this sensor, it can't properly shift the vehicle from gear to gear as the vehicle needs to change speed and rates of acceleration. The engine control module (PCM) or TCM will set code P0791.

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What are the common causes of P0791 ?

The most common causes of this code being stored are due to a defective intermediate shaft speed sensor, output speed sensor, or input speed sensor. Other common causes include shorted, open, corroded, or damaged wiring circuits or connectors, faulty shift solenoid/s, defective engine drivability sensors (especially the engine temperature sensor), dirty or contaminated transmission fluid that restricts flow, defective valve body, a faulty PCM. PCM failure is rare.



How do you troubleshoot P0791 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0791 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.

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