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I have a 1999 Olds Alero, When I am driving down the ...

Sent to Car Experts March 17 2006 at 7:36 AM
   

I have a 1999 Olds Alero, When I am driving down the highway at 55 mph it feels like the transmission is jumping in and out of overdrive. sometimes when my car is parked and i get in to start it the security light comes on and you can not start car until you move the gear shift back and forth several times. What could be causing this problem?

Optional Information:
1999 Oldsmobile alero 2.4l twin acm

Already Tried:
I have changed transmission fluid/filter bought actron mutil codes but will not show up anything unless engine light is on

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
March 17 2006 at 10:20 AM (2 hours and 44 minutes and 24 seconds later)
         
ACCEPTEDCheck Mark
Sounds like you may have a problem with your transmission range sensor. The range sensor tells the computer where the shifter is at and what gear to be in. If the sensor is not reading correctly the vehicle will not start in park or nuetral sometimes. It also will release the torque converter clutch which may feel like the kicking in and out of overdrive. You will almost need a scan tool that will check data so you can monitor the range sensor to see if it is acting up when the vehicle is. The Actron scan tool will work to retreive codes if there is any, but will not work for data. When monitoring the data or pids you are watching what is going on with the sensor you are watching.

I hope this helps. Please click the Accept button to close the question.
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autodoc_2000 -- Auto Service Technician -- 98% Positive Feedback on 945 Car Accepts
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