20th Jan 2006, 07:23

1999 300m 80,000 miles

I am having the same intermittent "turn off" condition. The car always starts after 30 minutes and runs fine. Trouble codes are p0171+p0172 Lean condition bank a+b. and p1684, battery disconnect. I am suspecting a fuel pump. Any ideas? My wife loves the car, I have 2 kids in college and don't want to upgrade yet.

Thanks Ken.

9th Apr 2006, 08:53

Just something to look at regarding the car dying. I had a 2000 Concorde that did the same thing. It died twice for no reason - had we been trying to make it across a busy road - I don't even want to think about it. One day by accident my mechanic was messing around the engine compartment while the engine was running - the car stalled. We started to look around the engine compartment and found that the battery terminals where you connect a jumper cable was loose. Don't know how the nut got loose. Tightened it and the car never died again. Check all the connections along the battery cables - may help, may not. Just something to think about.

2nd May 2006, 21:28

"That the Chrysler makes a good looking car, but they just don't hold up & are pretty UN reliable."

Depends on what kind of Chrysler it is. From my experiences, it seems like the Dodge/Plymouth Neon, the 1995-1998 Dodge Stratus/Plymouth Breeze and the LH-cars with the 2.7 L engine are the most unreliable. Everything else is just fine, IMO.

3rd May 2006, 08:49

What other cars are you talking about? Only the PT Cruiser has good reliability ratings, and the Chrysler minivans have never ever been reliable since their introduction in 1983.

3rd May 2006, 14:33

" (I am a Master ASE certified Auto Tech.) "

Just because you're a "Master" doesn't mean a mistake was made by another mechanic. This simply sounds like the throttle body/fuel pump needs outright replacement (the same exact thing occurred with my 2000 Focus).

28th Jul 2006, 11:12

I have a 99 300m and I changed the engine w/55,000 miles. New fan, water pump, time belting kit and thermostat. But my car is now over heating.

After I put in the water pump and the timing chain, I then started to filled it up with antifreeze through the reservoir. But it's not draining, so that I can keep filling up the system. I know I'n not supposed to do this, but I started filling it up through the radiator and nothing. I turn on the car, running for about 20 minutes and it started heating up. I bled it correctly. The hose that is connected to the reservoir and goes to the back is cold. Should it be hot when the car is running? Please someone help me.

22nd Mar 2007, 06:41

We just purchased a 1999 300M. It has higher miles (80,000) but it drove nice on the test drive and my husband is auto engineer. He checked it over and didn't seem to find anything wrong. 2 weeks after purchase the speedometer fails and the car down-shifts. She now will not come out of 2nd gear. My husband limps it home, and the check engine light comes on. He turns the car off and lets it sit for a minute or two, attempts to restart it. Nothing. The car will not start, doesn't want to turn over. He finally gets it running after 15-20 minutes and the mapping is all off: sputtering and missing, running really rough. That problem seems to have gone away after a trip around the block, how ever the engine light is still on and it won't shift out of 2nd (not even with auto-stick). She will go into reverse, so it isn't the trany. It has to be something electrical. Anyone have any ideas?

22nd Mar 2007, 16:22

The problem is easy (and cheap) to solve. All the symptoms point a single culprit: the output speed sensor. Is around 35 dollars (dealer) and 0.5h labor. Don't be angry, the car overall is very well rated. And don't forget to reset the computer after the sensor replacing. I would suggest as well to replace in the same time the input speed sensor (for the same price, and you save the labor) just to avoid further headaches. Good luck.


1st Apr 2007, 20:50

Where is the thermostat located on my 1999 300M?

17th Apr 2007, 08:17

Hello! I have a 99 Chrysler 300M. IT has about 120k on the mileage. Since I bought the car (around 80k) it has been known to slip up after it rains. The car in park will read anywhere from 50-90mph and the engine will rev, without any assistance. Normally I just shut the car off and it fixes it, but this time the check engine light turned on (it is solid not blinking so this is a plus!) I'm not sure what could be causing this problem. The old owner told me that there was an electrical harness that wasn't properly sealed, and Chrysler refused to fix it under the warranty... Any suggestions on why the check engine light could be on?

23rd May 2007, 21:23

Wow... I hope that never happens to me... I just bought one with 135000 miles.

22nd Jul 2007, 00:49

I just bought a 300m is nice and beautiful, but the ame day its overheating and am really disappointed.

3rd Sep 2007, 02:30

My mother has a 98 Sebring that had that computer problem that you just described. We never did figure out what it was, except that it had to do with the computer. They suggested replacing the whole thing... I don't think so! That car was in a bad wreck a couple years back. Got T-Boned right on the left front wheel. It broke the drive thing for that wheel. I forgot what it's called :) Anyway, they totalled it. I was in the car at the time. The air bags didn't go off, but we were OK. She now has another 98 Sebring that has the battery connection problem. Other than that the new one has been fine.

26th Sep 2007, 18:58

No one has actually mentioned if they took their 300M to Chrysler to diagnose the check light. You guys are going to a cheap corner mechanic or trying to figure it out yourselves, as if it's going to solve your problem. Please take your car to your Chrysler dealer. Tell them you only want them to diagnose and find the problem. That usually costs around $90. They'll give you a computer report. Then take it to your corner mechanic to fix it, if you want to save some money. BTW. Please let us know afterwards what the problem was and how it was fixed. Cause I'm thinking of buying one myself.

30th Dec 2007, 19:25

Need serious help please... I own a 99 300M. Problem: We were running 60 mph in heavy traffic; I floored the car to pass the transmission down shifted to passing gear as the motor accelerated. At this point in a second the engine made a thump as if it ran out of gas, it did not. The car died. I coasted the car off the road. The car turns over with no problem there is no engine grinding or sounds that would indicate any mechanical issues. Codes show timing good, cam good. Gas is not the problem the pump is functioning correctly. I am wondering if something in the transmission is stopping the car from running? Confused and need help.