2008 Pontiac Grand Prix Transmission issue

ERICWILLIAM

MEMBER
2008 PONTIAC GRAND PRIX
3.8L
V6
FWD
AUTOMATIC
90,000 MILES

I turned the car off when I got home everything was running fine then approximately fifteen minutes later I went to leave and reverse worked fine but drive and third did not work and first and second worked slipping at first until I reached approximately ten to fifteen mph then all gears worked fine as if nothing is wrong until I slow to below ten mph I checked fluid level and it was fine so I drained enough out to put Lucas transmission fix in it and nothing changed I'm hoping it's just a sensor but need to know if it is and which one please help.

6 Replies

SATURNTECH9

MECHANIC
30,870 POSTS

Have you checked for codes in the computer yet?Also I dont believe in miracles in a bottle to fix transmission problems etc.

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Sunday, August 9th, 2015 AT 7:56 AM

ERICWILLIAM

MEMBER
4 POSTS

No I didn't get it checked for codes but the check engine light isn't on nor is any other warning light would it still throw a code without the check engine light being on I've driven it enough to go through the drive cycle on the codes

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Sunday, August 9th, 2015 AT 8:00 AM

SATURNTECH9

MECHANIC
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Yes even without the check engine light on it could still have codes with as bad as it is I would think there would be a code. Not all of the cheap diyer code readers can read/see all the codes a car might have though.

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Sunday, August 9th, 2015 AT 8:26 AM

ERICWILLIAM

MEMBER
4 POSTS

Okay I will get it checked out thank you very much and yeah it's really strange how the transmission is acting like I said once I reach fifteen to twenty mph all gears work fine and it drives like nothing is wrong but thank you for the advice

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Sunday, August 9th, 2015 AT 8:31 AM

SATURNTECH9