Code Definition

P0793 — Counter gear speed signal missing - Sensor 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0793

P0793 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0793 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0793 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0793 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects no signal from the intermediate shaft (or counter gear) speed sensor, also referred to as Sensor 1. This sensor is critical for providing data on the speed of the intermediate shaft in the transmission, which is necessary for the TCM/ECM to control gear shifting accurately. A missing signal implies that the sensor is not transmitting any data to the control module, which can lead to significant issues in transmission operation, such as in...

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