Pontiac G6 Has No Power- Check Engine Light- Coolant Leak

2006 Pontiac G6. 4 cyl engine. New air filter, oil change, transmission flushed. Question: My car goes very sluggishly up hills...it seems fine on nice flat roads, but when going up hills, top speed is about 20 - 25 mph. It seems to stay at 3000 rpms and won't shift down...It has almost 100,000 miles on it. Is it just getting old?

No, its not getting old. From what you describe, it sounds like you may have a catalytic converter problem. Once they get a lot of miles on them, or get clogged up from bad gas, engine problems, or lack of maintenance, they will cause a driveability issue like what you are experiencing. If it does need replaced, you should get the correct converter for you car.

Some muffler shops use cheap aftermarket catalytic converters which will just cause more problems down the road. Also, with 100,000 miles on the car, you should consider a major tune up, including spark plugs, necessary filters, coolant flush, etc

pontiac g6

Download Our Ebook

Fuel Economy, Hybrids & Electric, Car Repairs, Recalls And More.

Problem with my 2007 Pontiac G6 3.5L V6. Low coolant level warning on dash. Added antifreeze several times. My 2007 Pontiac G6 with the 3.5L v6 engine is loosing anti-freeze. We have added several times, but gets low after driving a few weeks. When it goes low, the heater wont blow warm air when sitting at an idle. We have taken it to a shop 2 times. They pressure test, but cannot find a leak, although we smell it from time to time. What can I do to repair this problem?

The first thing would be to have a cooling pressure system test done to see why you are low on coolant. Low coolant will cause air pockets, and that is the most likely cause of no heat in the car, as long as the engine temperature is up to normal.

Some common areas are of course water pump, hoses, coolant pipes. There is a technical service bulletin on this car for no heat at idle. There is a procedure to remove air pockets that could be done. I will send that to you in a moment. The problem with this bulletin, is where did the coolant go to begin with. We have seen several of the 3.5l, and 3.9 V6 engine have leaking head gaskets causing this condition. There are several places that are common for them to leak. I will send a picture of these areas, so you can check it out yourself. If you need more assistance, just let me know, JK

2007 Pontiac G6. 2.4L check engine. Replaced cam shaft sensors(2). The light came back on after replacing the sensors. Tried to have it scanned again but the scanner won't turn on,the guy told me i have a blown fuse. Two other guys tried,but,the same thing happened,their scanners won't turn on either.Do i really have a blown fuse or is the problem something else?

If the scanners will not turn on, you have a power problem to the diagnostic connector. Usually the fuse blows, so yes I would think that's your problem. It is usually on the same circuit as the lighter or auxiliary outlet. Check the fuse box to find out which. You have multiple fuse boxes on your vehicle, one under the hood, one in the car and one in the trunk. Most likely the fuse you're looking for is in the fuse box under the hood. Once the fuse is replaced you should be able to power up the scanner and clear or check the codes again.

Help Keep Us Free-
Tip / Donation To the Mechanics

Q and A Main

How Things Work