P0794 indicates the powertrain or transmission control module has detected an intermittent signal from the automatic transmission's intermediate shaft speed sensor. The sensor reports the rotational speed of an internal transmission shaft, and an erratic or dropping signal can disrupt shift timing and torque-converter control. The code specifically points to a signal reliability or electrical circuit problem rather than a complete, steady failure.
The sensor's internal winding, Hall element, or connector can degrade, producing an erratic or dropping signal while still occasionally working.
Intermittent open circuits, corrosion, pin fretting, chafed insulation, or poor grounds in the sensor harness are common causes of a circuit-intermittent code.
A cracked, chipped, or debris-covered reluctor ring can generate missing or inconsistent pulses that the control module interprets as sensor circuit intermittency.
Severely degraded, contaminated, or low fluid can affect sensor readings and transmission operation, though it is less often the direct cause of an intermittent circuit code.
A rare possibility is an intermittent processing fault in the control module; this should only be considered after the sensor, wiring, and tone ring have been ruled out.
Short trips may be possible, but erratic shifting can worsen and lead to transmission stress; diagnosis is recommended promptly.
No, it specifically monitors an intermediate shaft; the exact sensor location varies by transmission design.
Usually not. PCM/TCM failure is uncommon for this code; most cases are caused by the sensor, wiring, or tone ring. Replace the module only as a last resort.
No. Clearing the code may turn off the light temporarily, but it will return if the intermittent signal fault is still present.