P2794 indicates the powertrain control module has detected a voltage signal below specification from the gear shift direction sensor circuit. This sensor reports the intended direction of gear change or confirms shifter position, and a "low" reading typically signifies a short to ground, open circuit, or internal sensor failure.
Internal failure of the transmission range sensor causing the signal voltage to drop below the calibrated threshold, often due to wear, fluid contamination, or damaged internal resistors.
The signal wire has chafed against the transmission housing or frame, creating an unintended path to ground that pulls the circuit voltage low.
Moisture intrusion at the sensor or harness connector causing high resistance, green crusting on terminals, or shorting between adjacent pins.
A broken wire or loose connection in the sensor's power or ground supply prevents proper operation and can cause erroneous low-voltage readings.
An internal input circuit fault within the PCM misinterpreting a normal signal; this is statistically rare and should only be considered after the sensor and wiring are verified good.
Short trips are possible but not recommended; the transmission may default to limp mode, limiting speed and potentially causing unsafe shifting behavior or unexpected gear changes.
They are often integrated into a single transmission range sensor assembly, but the direction circuit specifically tracks shifter movement path rather than just static gear position.
It is unlikely. The vast majority of P2794 faults are resolved by repairing wiring or replacing the transmission range sensor; PCM failure should only be considered after the sensor and entire circuit have been thoroughly tested and verified as fault-free.
No. The code will likely return immediately if the circuit remains shorted or the sensor has failed internally.