Transmission will not shift to first or second gears?

KIM ROSE2

MEMBER
1994 CHEVROLET SUBURBAN
5.7L
V8
4WD
AUTOMATIC
166,085 MILES

Lose / struggle power when turning left and won’t shift to 1st or 2nd by itself I can put it in 1st or 2nd manually but yeah, I’m lost. Help please.

Monday, January 29th, 2024 AT 10:19 PM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

We need to run the codes first, but it sounds like the VSS sensor needs to be replaced.

Here is the location of the sensor and a guide to help you check the codes:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Check out the images (below). Please let us know what happens.

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Tuesday, January 30th, 2024 AT 10:28 AM

KIM ROSE2

MEMBER
2 POSTS

Alright I’ll give that a go and see. I’ll let you know.

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Thursday, February 1st, 2024 AT 7:20 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

We had this problem in the shop not too long back, the speedometer works because there are two VSS sensors in the 4WD models. The sensor that runs the speedometer is in the transfer case.

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Thursday, February 1st, 2024 AT 11:36 AM