[Bambi]

Just after 2 weeks of buying my 2006 GTP the light has came on. she has roughly 60k miles, runs overall fantastic, no problems, perfect mint condition. I was trying to program a new keyless entry pad, of course that wouldn't work (found out later after screwing around with it ) i needed to program it at a dealership.

Well, Engine light is on solid. *as of this evening* Everything seems to be running ok? I sorta kinda hear some minor knocking? very light though? maybe it's just me. Update: The knocking is the actual engine itself wigglin and making the noise.. I can see and hear it when it's in park. Now to figure out what the check engine light is trying to tell me.


What the hell did I get myself into? carfax report seems perfect too.. any help is greatfull.

also; is there a way to get a code or anything? because I don't see anything? I'm just trying to avoid having to fork out money that I literally do not have at this moment. Does the diagnostic cost a fortune? free? what?

Thanks a bunch once again!

Angela

 

[Lampoon]

Did u buy it "as is"?
Run it back by there and ask them whats up.

Could be something simple.

I had the same issue with a 2002 Cougar. Turned out one cylinder wasnt firing because the spark plug wire had crapped out. Replaced them and its been humming along now almost a year with nothing but an oil change.

 

[Bambi]

We found out it was Code P0128 I think? Something about the Engine Coolant. it's nice and full, so it's possible something isn't reading right. The car isn't over heating at all. the dealership ( small family owned ) location, offered to fix it. I have yet to run it through DEQ here in Oregon. so, here's the odd part. I drove it to my inlaws tonight, parked it up on her steep driveway.. for roughly 2 - 3 hours.. got in the car, and the light is off.. What the heck?

I wonder if they will still fix it even though the light is out now? I'm glad it's not anything MAJOR, but even something simple my father could fix. My husband is NOT a car guy. haha updates as they come!

 

[Lampoon]

Just cause yours CEL (check engine light) is now off does not mean that your ECM did not capture the code. My guess would be the sensor is failing, hence the intermittant issue.

 

[TECH946]

a p0128 is for engine coolent not reachign temp in time, 99% of times it is a sticking/ faulty thermostat

 

[Bambi]

Thanks guys!

 

[bbeckers24]

ok I have the same problem. but my temperature gauge isnt working. I t was intermittent, but has now been out a few days. I replaced the engine coolant sensor, but no change. Is there a different sensor than the one in the back of the block, a friend of mine suggested that maybe there was a sensor for the gauge and one for the computer. I'm stumped. Right now, it isnt a huge problem, but the car will not allow the AC to come on without the gauge working. I know this because when it was intermittent, the AC would work when the gauge did and not when the gauge didnt. There is power to the gauge because it still sweeps when you start up the car. PLEASE HELP.

 

[Lampoon]

year, model, coupe/sedan, engine??

 

[bbeckers24]

2006 GTP Coupe with the 3.9L

 

[Lampoon]

any check engine lights/codes?

I know for sure a p0128 will casue that issue.
if there is a p0128 99% of the time replaceing the thermostat will fix it.

 

[coupe_gtp]

sure quote andy alot heh.

 

[TECH946]

andy?

when a/c will not work is the outside temp displaying?

when a/c wont work and outside temp is not working 99% of time it is the temp sensor

 

[coupe_gtp]

I was just joking with rob, he gets the jab heh.

 

[Lampoon]

My fellow Ram Air buddy....waaaas up Coupe?

 

[bbeckers24]

Ok. Got it figured out. There is not a separate sensor for the computer and gauge as my mechanic friends thought. There is only one. After messing with it, I went and checked and noticed the gauge was working again. I unplugged the sensor and the gauge quit. This confirmed only one sensor. About the same time I figured this out, my mechanic friend confirmed from pontiac that the gauge does not have a separate sensor. Then I noticed it stopped again. Turns out it isn't the sensor that is bad, but a bad wire at the connector. I dont know if its the same on all the cars, but for whatever reason my connector wire seemed pretty short which caused a kink at the connector. When I wiggle the wires at the connector it goes on and off. I ordered a new connector. Hopefully all will be good when I replace it. Thanks for all the help. FYI I found the connector from rockauto.com which I heard of through this site. Their prices are pretty dang good. I recently ordered a radiator hose for another car that was $80 on most sites, but just under $60 there. Keep them in mind if you are looking for parts.

 

[geewhiz]

Great! Thanks for posting the resolution!

 

[MissAnn2992]

My 2007 Pontiac G6 GT 3.5L V6 is throwing 2 codes p0128 p0118 I checked my wires and they looked fine. This happened after I used dialectic grease on all my connector's. My car is at 79k miles , engine coolant is not leaking, temp gauge not working so I replaced my temperature sensor with one from a salvage yard. It worked fine after that, now the next day after work it just stopped working while driving home from work. My AC is blowing hot air. Car isn't overheating/no smoke coming from under the hood. What could be wrong??

 

[rebel65]

My 2007 Pontiac G6 GT 3.5L V6 is throwing 2 codes p0128 p0118 I checked my wires and they looked fine. This happened after I used dialectic grease on all my connector's. My car is at 79k miles , engine coolant is not leaking, temp gauge not working so I replaced my temperature sensor with one from a salvage yard. It worked fine after that, now the next day after work it just stopped working while driving home from work. My AC is blowing hot air. Car isn't overheating/no smoke coming from under the hood. What could be wrong??

REPLACE THE THERMOSTAT. It is stuck OPEN and will do all you post of. Just had that a couple months ago and posted of it on the forum.