Code Definition

P0794 — Counter gear speed signal intermittent - Sensor 1

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

About P0794

P0794 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 P0794 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 P0794 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 P0794 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects an intermittent signal from the intermediate shaft (or counter gear) speed sensor, also known as Sensor 1. This sensor is vital for providing accurate speed data of the intermediate shaft in the transmission, which the TCM/ECM uses for precise gear shifting control. An intermittent signal suggests sporadic connectivity or sensor performance issues, leading to erratic transmission behaviour, such as unpredictable shifting, potential slippi...

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