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Transaxle potential speed sensor problem?

Tiny
CONNARD58
  • MEMBER
  • 1998 SATURN SL2
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Service Engine light is on and intermittently car rpm revs higher and car lurches forward briefly when slowing down to a stop, sluggish acceleration from stop and hard banging into reverse. Possible input or output speed sensor problem? Not a mechanic so I can't scan for codes. Thanks.
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Sunday, June 25th, 2023 AT 5:50 AM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,912 POSTS
It is easy to scan for code which is a must to fix this problem after checking the level of the transmission fluid, these guides can help us:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over these guides and get back to us.

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Sunday, June 25th, 2023 AT 3:08 PM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
Okay, thanks. The fluid level is okay, and filter is newish. Will get a scanner and follow the guides to get the codes. Will report back with results.
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Sunday, June 25th, 2023 AT 7:51 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,912 POSTS
Sounds good.
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Monday, June 26th, 2023 AT 12:10 PM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
FYI, waiting for my scanner to arrive after ordering online. Probably next week. Happy Fourth!
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Friday, June 30th, 2023 AT 7:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,912 POSTS
Good job, let me know happy 4th of July!
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Saturday, July 1st, 2023 AT 11:09 AM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
Okay, here are the codes before erasing them which by the way turned off the check engine light and surprisingly so far has returned the Transmission to normal operation although I haven't driven much. Just FYI.
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Tuesday, July 11th, 2023 AT 12:09 AM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
Transmission sensor code is back and problem with transmission back. Any advice?
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Tuesday, July 11th, 2023 AT 7:05 AM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
Okay, I discovered the black/white ground wire was disconnected from the sensor. I reconnected and it ran fine for a bit then failed again to same problem. Now a funny noise is coming from the sensor when the engine is running. Maybe it's shot?
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Tuesday, July 11th, 2023 AT 10:03 AM
Tiny
CONNARD58
  • MEMBER
  • 7 POSTS
Okay, classic amateur mistake. Attached the ground to wrong terminal. Got it right and she runs like new. My old warhorse is back in business. Thanks for the scanner tip you saved me a bundle! Cheers!
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Tuesday, July 11th, 2023 AT 10:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,912 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Thursday, July 13th, 2023 AT 9:00 AM

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