P0705
OBD-II Diagnostic Code
Severity: ModerateWhat Does This Error Mean?
P0705 means the transmission range sensor (also called the neutral safety switch or PRNDL sensor) is sending an invalid signal. The ECM cannot determine which gear position is selected. The sensor, its wiring, or the shift linkage adjustment may be the problem.
Affected Models
- All OBD-II vehicles with automatic transmissions (1996+)
Common Causes
- Transmission range sensor failed
- Shift linkage misadjusted
- Sensor connector corroded
- Internal transmission wiring fault
- Low transmission fluid affecting sensor
How to Fix It
-
Check transmission fluid level and condition.
Low or dirty fluid can affect sensor readings in some vehicles.
-
Inspect the sensor connector for corrosion.
The sensor is on the outside of the transmission. Clean any corrosion from the connector.
-
Check shift linkage adjustment.
If the linkage is loose or misadjusted, the sensor does not match the actual gear position.
-
Replace the transmission range sensor.
Sensors cost $30-$100. On most vehicles they are externally mounted and accessible.
Frequently Asked Questions
Can P0705 prevent the car from starting?
Yes. The neutral safety switch prevents starting in gear. If the sensor is faulty, the ECM may not allow the starter to engage.
Is P0705 the same as the neutral safety switch?
Yes. The transmission range sensor serves as the neutral safety switch on modern vehicles. It tells the ECM what gear is selected and prevents starting in Drive or Reverse.