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Check transmission light on....rpms up and down....code...po705...trans range sensor

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I assume we're talking about a Jeep? Is your overdrive slipping out on it's own? Then going back to normal if you start the vehicle? Any trouble with the back-up lights?
Codes are just starting points. Honestly I would ty cleaning these sensors first(especially the NSS (indicative of the Check eng lite)...I think it's on the drivers side of the trans.), but be careful!!!! they are easy to break!!!! So before you go spending thousands on a new tranny spend a few $'s cleaning them (NSS gets really dirty), also the TPS, throttle position sensor (it's also a trans sensor).
P0705 Transmission Range Sensor Circuit malfunction (PRNDL Input) <=== NSS Switch.
The P0705 error means the computer sensed something wrong with the sensor. Ex: the vehicle is moving when the sensor indicates it's in park, or possibly a different gear,or it sensed the input shaft (engine) start turning when the sensor is indicating it's in drive.

The NSS is about $350 new, but you don't need to replace it as it costs nothing to clean and rebuild. Figure maybe an hour of labor, a socket set, an adjustable wrench, philips screwdriver to remove and disassemble it. You'll want some kind of solvent (not WD40), a wire brush, and/or sandpaper to clean up the contacts, and some oxyguard or di-electric grease (like the red grease they put on your battery posts to keep them from corroding?). to coat the contacts when your done. Spraying the shaft of the sensor with penetrating fluid ahead of time will help get it off.
NSS (neutral safety switch) >>> 12mm wrench, a crescent wrench and a screwdriver.
Located on the driver's side of the transmission. That's where I would start.
Sensors are TPS (Throttle Position Sensor), NSS, Speed (transmission speed, not drive speed).
Hope this helps, but without being there it's all I can do.
Good luck
Maybe this will help make some sense of it:

Posted on Oct 21, 2010

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