P0708 signals that the transmission range sensor is sending a voltage reading higher than the expected range to the vehicle's control module. This sensor communicates the gear selector position, and an abnormally high signal usually points to a short, sensor failure, or wiring issue.
The sensor itself can develop an internal short or fail, causing it to output a voltage that is consistently high.
Corroded, broken, or loose wires and connectors between the sensor and the control module can create a high‑voltage condition.
If the shift linkage is out of specification, the sensor may never see the correct position and can report an abnormal voltage.
A rare internal failure in the module can misinterpret sensor signals, but this is less common than sensor or wiring issues.
Severe internal damage that affects the sensor's mounting or movement can cause abnormal readings, though it is uncommon.
No. The PCM is rarely the cause; most often the issue is a faulty sensor, wiring problem, or misadjusted linkage.
Low fluid can cause shifting problems but does not directly generate a high‑circuit reading from the range sensor.
It can cause drivability issues such as limited gear selection or limp mode, so it should be addressed promptly but is not an immediate safety hazard.