2002 Grand Am Speed not registering while driving [Archive] - GrandAmGT.com Forum


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07-15-2013, 01:45 PM
I have a 2002 Grand am 89K miles and while driving the spedo needle will just drop and then pick back up, then it wont pick up at all, causing the transmission to "neutral" out the engine wont move he car at all, it happened once before and i swapped the speed sensor under the trans now its doing it again..... all i know is that it almost left me stranded on the freeway at 65 MPH

07-15-2013, 07:42 PM
So, the car is coming out of gear while you're driving??? Right?

That's the main issue here, the speedo is probably a symptom of this issue.

07-16-2013, 12:27 PM
It feels like it is because the throttle is unresponsive in regards to the transmission, the RPM will go up but the Gear will not grab at all, it feels like it does neutral out but when the sensor picks up it grabs gear for a split sec then the needle dances around again from 0- whatever speed im at and nothing i was crusing down the freeway at 65 speedo said nothing rpm was at 4k

07-16-2013, 03:30 PM
Well now... you have no Check Engine light on, or Check Vehicle light I assume, right?

07-16-2013, 04:51 PM
Right, NO CEL or SVS or ABS, NOTHING lol its is the oddest thing

07-16-2013, 05:23 PM
Does it kick or buck or anything? While it is "neutraling out" as you call it lol , if you hit the gas, does the engine still rev up?

07-16-2013, 07:51 PM
Yeah if I hit the gas it revs the it kicks n it "neutrals" again

07-16-2013, 08:03 PM
Okay, from what I remember on these transmissions, they're electronically controlled, and also the speedometer registers from the tranny.

Sooooo, I'm going to say you've got an electrical issue in the tranny.

I also think it's entirely possible it's the transmission control relay (that isn't the whole name, AaronGTR was telling someone about it, I remember bits of the posts, but can't think of the thread) type of issue, it's come up before, it kept the tranny from engaging iirc.

Do some searching on here, just search "transmission" or "gear" and see what you find, I just can't think of where I read this before man, but it is on the lines of an issue someone was on here having, but they had it going from park I think

07-16-2013, 09:52 PM
Ok I will look it up, to see what I can do to fix it, it's been fine for a few days I n
Know I swapped the sensor and it fixed it for a while but it came back

07-16-2013, 09:58 PM
What was it doing before you switched your sensor?

07-16-2013, 11:38 PM
The same thing as now, I doubt it went bad again, it's been a few months

07-17-2013, 06:59 PM
If it went bad that fast, I would wonder if something could be making it go bad. I'd point at the sensor for sure, or at least the connection from it back up into the computer, maybe something hit it? pinched the wire, or stripped it a little so it's touching metal and shorting itself out for a minute??

07-17-2013, 08:59 PM
That's what I wanted to check, if it was the wiring hopefully it's so etching simple not the computer

07-17-2013, 09:19 PM
I would check the ever loving hell out of the connections and wires man, if it's not the sensor, it is entirely possible it's what it attaches too.

But, bad batches of parts do get out, so it might (might-might) be that sensor again.

07-18-2013, 09:26 AM
That is what i am thinking because its been like 3 - 4 months since i changed the sensor, i doubt it can go out that quick, and it is back up and running again, sensor is on bottom of trans, could of been hit wile driving or something :-/

07-18-2013, 06:55 PM
are there any marks on it? or around it?

07-19-2013, 09:54 AM
I have yet to check, i will do it tomorrow because this morning it did it again, but when i came to a complete stop it worked normally, that is what i don't understand

07-22-2013, 10:43 AM
IT did it to me again today, and I noticed that the Cruise Control does not work, would that cause it to act up, like if the module is bad would that cause the short between the two (speed sensor-computer)