codes P013A and P0128 2007 Jeep Commander 5.7 Hemi

Work the P0128 first and let us know the outcome. A code P0128 may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty intake air temperature (IAT) sensor Read more: p0128

I will do the test for a stuck open Thermostat, which is to feel the radiator hose as the engine is warming up. If it gradually warms instead of being cold until it reaches the thermostat temperature then it does indicate a stuck thermostat. Unfortunately it will have to wait until next week because it is my daughter's car and she is driving to work every day this week.

99 percent stuck open thermostat. 02 and thermostat code not related.

That's what I am thinking. Thermostat stuck open. I will be replacing it this coming Sunday.

I have never seen a p0128 where it wasn't the thermostat. If cts circuit has a problem you would get a low or high voltage cts code.

Regarding the P013A code, I am seeing a lot of posts that people are spending a lot of money replacing parts without solving the problem. I am thinking of replacing the whole exhaust pipe catalytic converter assembly including all four O2 sensors. But, then I see some people saying they have solved the issue by changing out the ECU. I can see this costing thousands and maybe still not solving it. I would like to hear from people who actually have fixed the problem. This fall during the cold weather is the first time the code has been thrown. But, for the past two years every time it is cold outside the car has stalled. It usually sputters just a little then goes dead. It can be immediately restarted. But, it may or may not stall again during the same drive. As I mentioned earlier, I can reset the codes and they will come back again within a few miles. It is still stalling from time to time. It never stalls during warm or hot weather only cold (below 35 degrees).

The only thing that would cause a problem when cold is higher resistance because of colder temperatures. Check any thing with a coil of wire or an element or connector issues. I have a 2008 Chevy trailblazer that every winter the abs and traction control light comes on. I know what the problem is just never fixed it. It has to do with the steering wheel position sensor. It has a coil of wire in it and when it starts to get cold towards winter light comes on. Then in warmer temperatures the light never comes on. Cold temperatures affect resistance values. How many miles on vehicle? 02 sensors should be replaced I would say around 100000 miles preventive maintaince. I am replacing mine 106000 miles. Exhaust leaks can cause this code or bad 02. Could take a shop vac force air into tail pipe cold and listen for air and take soapy water wipe at joints look for bubbles. I use a smoke machine. Stalling can be caused by many things. Does it stall under load or decel engine hot or cold? Could be carbon build up on valves or dirty injectors..... Get some techron total fuel system cleaner put in 1/2 tank high test gas see if it helps. A bad cat will usually trigger a cat code summer or winter p0420 or p0430. The post cat waveform will look like the pre cat waveform same switching frequency. Yours is slow response. Need graphing meter or labscope to test do some snap throttle and add propane and see how cat responds while monitoring pre and post cat 02 sensors called oxygen storage test. A bad cat would cause stalling and hard start issues restricted cat test exhaust back pressure tests. Don't sound like a restricted cat. Pcm don't usually go bad unless something shorts them like a faulty coil or injector kills driver inside pcm but now manufacturers are placing protection devices inside pcm to protect them. Seen shorted 02 heater circuits and repair short and 02 comes back to life. Sorry so long. Need equipment to test plus knowledge. Good luck. Could pay ase certified shop hour diagnostic time to diagnose but would have to duplicate problem with testing equipment hooked up.

All good comments and advice. I probably will change the offending O2 sensor first. That seems to me to be the cheapest fix. I may do all four at once. I can get a mechanic to replace it for $200 in his 'off' time. I can do more simple things like changing the thermostat, but I don't do the getting under the car things any more. I am 72 and just not as agile as I once was.

I understand the age thing. I am 61 and joints ache sometimes arthritis in back. By the grace of God I make it day by day. I want to tell you make sure you get oe 02 sensors not aftermarket ones. Chrysler vehicles the pcm doesn't like the aftermarket ones. Chrysler also runs a 2.5 volt bias ground voltage. I have seen problems with Chrysler vehicles even recommend on all other manufacturers. Even aftermarket cats can cause the light to come back on. Just a heads up hate to see you have aftermarket 02 sensors installed only for the light to come on for multiple sensors codes. I use nothing but oe parts I have seen lots of junk defective aftermarket parts am now seeing even defective oe parts too but back starting around 2004 or 2005 starting seeing problems with Chrysler aftermarket 02 sensors where the previous garage replaced 02 with aftermarket because of the light then even replaced pcm still had problem ended up being aftermarket 02 sensor replaced with oe tested with lab scope aftermarket and oe seen differences and problem went away. Good luck!!! God bless!!!! Have a Merry Christmas!!!

Thanks for the reinforcement of using OE O2 sensors. I have been reading about the aftermarket ones not working and after replacing them with the OE ones the problem went away. I am just hoping that fixes mine. Catalytic converters are expensive! Thanks for the suggestions. Merry Christmas to you as well!

I replaced the thermostat this past Friday. It was definitely bad. That resolved the P0128 code. But, the P013A code is still being thrown. The temperatures are down in the lower 20s and the engine stalling is back.

Stalling under load or during decel? Stall engine hot or cold or both? Did you replace rear 02 sensor?

I haven't replaced the rear sensor yet. I will do that in about a week. I will (should say I will have someone) replace all four at the same time. It stalls after the engine is warm. Not sure if under load or not. Seems to be erratic, but maybe more during deceleration. As I mentioned before, the stalling has been a problem for about two years only in cold weather. This year is the first time the P013A code has been thrown. It is my daughter's car and she says the gas mileage has been poor for a long time. It generally sputters a little then engine shuts down. It can be started immediately, though. She said it stalled twice within a few blocks today.

The post cat 02 I don't think is your stalling problem. If your throttle body is dirty can cause stalling during decel. May need cleaned I can tell you how if drive by wire. If stalling under load may be secondary ignition or dirty injectors carbon on valves. How's starting? Delayed or extended crank.

It starts easily. I did run some seafoam through last year. Didn't seem to help. I may have found the solution to the stalling. Possibly spark plugs! https://www.jeepcommander.com/threads/2 ... sue.27890/

Plugs usually cause misfire or stall under load. I would change plugs if original plus clean throttle body.

I replaced all but 6 of the plugs. There is a brake booster that is covering the number 8 cylinder. I didn't want to mess with bleeding brakes. Also, the number 3 and number 5 cylinders have something in the way so I couldn't get to them replaced either. I am afraid I failed. But, the ones I replaced were the correct spark plugs, the ones with the black cap. It has 133,000 miles so the remaining plugs really need to be replaced. I am sure they are original. I will have that done and have the throttle body cleaned. Thanks again for the help.

After cleaning tb a idle relearn will have to be done with scan tool. Good luck. Have a Happy new year!!!