OBD-II code P0706 indicates that the powertrain control module (PCM) has detected a voltage or signal from the transmission range sensor that is outside the expected range or does not correlate with other engine data. The transmission range sensor, often integrated with the neutral safety switch, tells the computer which gear the driver has selected.
The sensor itself has failed internally, causing it to send an out-of-range or erratic signal to the PCM. This is the most common cause of this code.
The sensor is mechanically out of alignment with the shift linkage. If the sensor does not accurately reflect the physical gear position, the PCM will flag a range/performance fault.
Corroded, chafed, or loose wiring and connectors in the sensor circuit can cause high resistance, opens, or shorts, leading to an incorrect voltage reading at the PCM.
Mechanical binding in the shift linkage or internal transmission components can prevent the sensor from moving to the correct position for each gear.
A rare internal failure within the powertrain control module causing it to misread the sensor signal. This should only be considered after all other components and wiring are verified.
It is not recommended. The transmission may shift unpredictably, enter limp mode, or the engine may fail to start in Park or Neutral, making the vehicle unsafe to operate.
On many vehicles, the transmission range sensor and the neutral safety switch are the same component. On others, they are separate, but they both serve to communicate shift lever position to the vehicle's computer.
No, replacing the PCM is usually the wrong fix for this code. The problem is almost always a failed transmission range sensor, an adjustment issue, or a wiring fault. The PCM should only be suspected after all other possibilities have been thoroughly tested and ruled out.
Basic hand tools are usually sufficient to replace the sensor, but proper alignment or adjustment is often required after installation. A scan tool is highly recommended to verify that the sensor reads correctly across all gear positions.