1999 Saturn SL2 Shifting

JAMES MILLICK

MEMBER
1999 SATURN SL2

Transmission problem
1999 Saturn SL2 4 cyl Front Wheel Drive Automatic

After I let the car come up to operating temperature and put the car in drive it will reach about 20 mph and not shift any further. If I put the car in 3rd gear it will shift at 10 mph, 20 mph and between 30 and 35 mph but will not go into overdrive. The transmission fluid level is where it needs to be. Any help would be greatly appreciated. Thank you.

3 Replies

SATURNTECH9

MECHANIC
30,869 POSTS

When ur at 20mph and it wont shift if u let up on the gas a little will it shift then?Also what codes do u have I would think if the car wasnt shifting u would have codes. Let me know.

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Friday, January 22nd, 2010 AT 9:48 PM

JAMES MILLICK

MEMBER
2 POSTS

Before I started the test run today I had 341 as a code - camshaft position sensor circuit range/performance. That code disappeared after I test ran the car. It does not shift up if I let up on the accelerator. I have one code, 706 - transmission range sensor circuit range/performance. I don't know what that means. When the car reaches 53/54 mph the transmission disengages, the engine revs, and there is no drive until I reduce the speed of the car to about 30 mph and then the transmission re-engages. Thanks for your help. I really appreciate it.

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Saturday, January 23rd, 2010 AT 2:35 PM

SATURNTECH9

MECHANIC
30,869 POSTS

Ur po341 is usually the spark plug wires or spark plugs have some black carbon on them causing the code. Now on p0706 that is ur selector switch fault aka neautral safety switch. That tells the computer what gear u put the shifter in.U probably have a bad one and its reading back to the computer invalid when ur in drive. The way u can check that is to get it hot where it acts up and get a code scanner that can read transmission data like trans input speed etc. Then u look at that data while ur shifting thru the gears with the shifter and the car not running and as u shift thru gears it should read each gear u shift into like park reverse etc if it reads invalid in any of those gears u have a bad selector switch.U watch what is called trans selector data on the scanner screen. Let me know what u find.

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Saturday, January 23rd, 2010 AT 8:43 PM