P0791 OBD-II: Intermediate Shaft Speed Sensor "A" Circuit

P0791 Severity

Urgent

Should you fix P0791 yourself?

Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.

Proper diagnosis will save you time and money on unnecessary repairs.

Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.

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P0791 Summary Find a Repair Shop P0791 Details Ask RepairPal CarGenius Other OBD-II Codes

What causes OBD-II fault code P0791?

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.

OBD II Fault Code

OBD II P0791

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

Transmission may not shift properly Symptoms

Increased fuel consumption
Transmission may not shift properly

Common Problems That Trigger the P0791 Code

Intermediate shaft speed sensor failure
Powertrain Control Module (PCM) failure
Transmission Control Module (TCM) failure
Wiring issue

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Other OBD-II Codes

P0790: normal/Performance Switch Circuit P078E: Shift Timing Solenoid "B" Intermittent P078D: Shift Timing Solenoid "B" High P078C: Shift Timing Solenoid "B" Low P078B: Shift Timing Solenoid "B" Range/Performance P078A: Shift Timing Solenoid "B"P0789: Shift Timing Solenoid "A" Intermittent P0788: Shift Timing Solenoid "A" High P0787: Shift Timing Solenoid "A" Low P0786: Shift Timing Solenoid "A" Range/Performance P0785: Shift Timing Solenoid "A"P0784: 4-5 Shift P0792: Intermediate Shaft Speed Sensor "A" Circuit Range/Performance P0793: Intermediate Shaft Speed Sensor "A" Circuit no Signal P0794: Intermediate Shaft Speed Sensor "A" Circuit Intermittent P0795: Pressure Control Solenoid "C"P0796: Pressure Control Solenoid "C" Performance/Stuck Off P0797: Pressure Control Solenoid "C" Stuck On P0798: Pressure Control Solenoid "C" Electrical P0799: Pressure Control Solenoid "C" Intermittent P079A: Transmission Friction Element "A" Slip Detected P079B: Transmission Friction Element "B" Slip Detected P079C: Transmission Friction Element "C" Slip Detected P079D: Transmission Friction Element "D" Slip Detected

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