Transmission will not shift out of first gear

Tiny
WES FITCHHORN
  • MEMBER
  • 2001 OLDSMOBILE ALERO
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I change the water pump in my car put it all back together timed it. Now it won't shift from 1st gear.
Thursday, February 13th, 2020 AT 5:37 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Is the check engine light on? If it is, do you know the code?

I attached a flow chart and possible issues.

https://www.2carpros.com/articles/automatic-transmission-problems

The throttle position sensor is critical in shifting. If the ECM does not see the signal, it will not shift.

Check the voltage with a scan tool to see if there is a signal being sent to the ECM.

Roy
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Thursday, February 13th, 2020 AT 6:59 PM

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