Well I posted earlier about my search for an srt6 and finally the dealer gave me the deal I was looking for but upon delivery there is a slight snag.the vehicle in question is an 05 srt6 with a hair over 40k miles.The dealer agreed to deliver the car to me today because I live about 70 miles from them and I'm in Ct and the dealer is in RI.The salesman gets here and I get in the car to take it to the emissions station which is mandatory here to register a car.I notice the A/C isnt blowing cold and the low coolant light is on.Luckily I hadn't signed the final paperwork yet so the salesman makes arrangements for us to take it to a local dealer and they tell us it needs a PCM which of course the seller is going to pay for.they were kind enough to get me a rental while I'm waiting for my new ride.My question is will installing a new PCM send out codes when they run it thru emissions? I remember my explorer was a pain in the neck I had to drive it about 200 miles to run the computer thru its cycles before the emissions station would test it.Anyone have any experience with this ?

 

What does the PCM have to do with the A/C and coolant light?

Sorry, I have no answer to your question, I'm sure another member will chime in.

 

If you don't see water under the car. The most common cause for a re-ocurring low coolant light is intercooler leak, this is an $1800 repair unless you do the work yourself, then your looking at $1100.

 

Wow now I'm wondering if the tech misdiagnosed the problem.Originally we were told that the fan wasn't coming on when it should so they said they had to test the sensor relay and fan itself.About an hour later they let the salesman know it was the PCM,they had to order it and it would be there in 3 to 5 days.The chrysler dealership that diagnosed the problem is not the one I'm buying from since it was about 50 miles away.I'll definitely mention the IC leak possibility.Back to my original question I know some vehicles after their comp has spit out a code and it has been cleared there is a time period you need to drive the car/put in a certain number of miles to allow the comp monitors to cycle.I know emissions stations here wont pass your vehicle until the comp is reading all cycles performed.I ran into this problem with my explorer,will replacing the PCM cause a comp reset?

 

I havn't heard of any PCM's needing to be replaced. I would have the dealer complete the emisions test as part of the purchase. I don't know your state emissions laws, but in many states the dealer is responcible to correct the issue if the vehicle fails the emisions check.

 

YES---50 amp fuse under the hood---in a box of three---passenger side---It controls the fan motor---when the fan is not working on high speed the PCM cuts the A/C to help the car not overheat. You would have MORE problems if you had a bad computer---The PCM is doing its job---I have had 7 Crossfires and this has happen to 2 of them. Good luck---Jimmy

 

Also---This light is not only LOW COOLANT but cooling system problem (double duty)---A BAD fan which will have the temp increase will trip this light. Techs will misdiagnose this car all the time. Not enough time working on them due to the fact not that many made of them. The fuse I'm talking about is the outside one in the group of three---one 200amp & two 50 amps---Check it first---Next question is why it blew. I bought and sold cars this is why I had six XFs. When I replaced the fuse all was fine for 1000s of miles in both cars, so I never saw any other problems. I am still in touch with one of the owners of one of the cars and he still has had nothing else cooling system related---so no answer on why. MAKE then replace the fan not just the fuse---OVER 50 amps were pulled for SOME reason---Maybe overkill but NOW is the time---The dealer will not help in 6 months---Jimmy

 

Wow, that is informative, this guy has his ear to the rail or ground ...Woody. Heed his data!

Weekend weeeeeeeeeee

 

To answer your question about the computer. Yes like any OBDII computer when it is reset (and it will be) you must meet certain driving conditions prior to the computer being ready for emissions testing.

If you google you can find out what tests the computer is looking for.

 

Yes---100%---must reset what is called the monitoring systems---much like a teacher calling roll back in school---everything must say "here"---takes a couple of drive cycles---PCM must see a few different things. Good luck---I still think your PCM is just fine---it is however getting a BAD signal---there is a difference---Please drive to the stealership and fine the fuse box. About half way from the battery and the coolant reservoir; on the shock mount. CORRECTION it is the outside one toward the airbox---just checked---you have a 200 amp and two 50 amps in a SRT. It's the outside one that controls the fan. THEN show them up!!!! God bless them!!!!

 

thanks for the info does anyone know the parameters you have to put the car thru to clear out all the monitors? I remember with my explorer there was a certain set of things you could do to avoid having to actually drive the car for 500 miles before they cleared out.I'm more concerned with the possible IC leaking.The same coolant that is circulated thru the engine and radiator is shared by the IC correct? So a pressure test should detect an IC leak since there is nothing leaking to the ground.

 

PCM is looking for cold start (open loop) then closed loop, acceleration/ deceleration between different speeds, etc---every car program is a little different. 500 is a lot---did not get a good mix is my guess. When I had my repair shoppes, 30 to 70 of city and hwy---more city, cleared everything. If the coolant bottle is full, you do not have a leak: can't---coolant is full---You are correct---shared pressurized system for both. To check: Fill the bottle if low---pressurize, but be careful here, do not over max pressure or you can MAKE a leak: go just BELOW max pressure---let stand---if the pressure does not drop and coolant level stays the same, no leak---However, an IC leak would not explain why the fan did not come on. An IC leak would make the fan run LONGER than normal due to low coolant---the fan would try to compensate for the increase temp reading by running longer trying to bring the temp down---not the opposite by cutting off. Good luck. Jimmy

 

thanks for all your help and info guys.I just spoke to the service manager and asked if the coolant level was low or was the light on for a fan failure and I was told it was not from low coolant it was because the fan was not kicking on.I then said this is a commonly misdiagnosed issue and she said the tech tested both the fan and the fuse.I asked if it was also low on coolant and she said no but didn't sound too convincing so for peace of mind I called the stealership I am buying it from and told the service manager there I want them to perform a coolant system leak down test.Worst case scenario I have to do the test myself and then take it back while its still under warranty I have a leak down kit here.

 

Just FYI---There is more than one fuse---also, temp sensor, bad fan, bad relay, bad ground and the list goes on for reasons why the fan would not come on; MANY checks BEFORE I would let my shop condemn a PCM---Still does not make sense to me, just THAT side of the PCM is bad, no other problems? But COULD BE!!! Again, if coolant is full = zero leak---you should be good, but check anyways---Still, low coolant would not cause an inop fan---overworked not inop. No matter what---My questions are---First, how long has this car been running without a GOOD fan?---Really, how long? You KNOW that it is not working; you do not know for how long. No fan = increased HEAT, and heat is bad for the motor---No matter what the reason---Also #2, if it is the PCM---How long has this car been running with a bad PCM and what other functions have been turned off (other than the fan) or running incorrectly? Rich/ Lean, what else? Think about it---this is a HIGH dollar car to repair at times---AMG parts are not cheap!!! Good luck, Jimmy

 

The dealer replaced my pcm 2 years ago while still under warranty, and they gave it back to me without any problems since. Then of course I had to have Eurocharged upgrade the software again.

 

Did your bad PCM kill only the fan? Mine was replaced on one Crossfire because the dealer blew it up trying to repair the alarm problem! Also the My/slip is cool!!!

 

Interesting,the stealership says the PCM is considered an emissions part and is covered under 100k emissions parts warranty.I thought these cars came with a 7/70 powertrain warranty?

 

That's what they said when THEY blew mine up when working on the alarm (another story), and this was AFTER I told them they had only 30 tries from this forum and MB World. I got a new PCM that was made Spain (?). Keep us posted---Good luck, Jimmy

 

So what they are saying is that the car did not come with a 7/70 but this part is considered part of the emissions system.I will get a 90 day 3000 mile warranty by law from the stealership I'm buying it from anyway.

 

Also--The Fed makes car manufacturer give the 8yr/ 100k warranty on emissions, that's why I think the dealer JUMPED on this---They get to bill the manufacturer $1800 plus job---MAYBE more. Like I said I owned repair shops for over 10 years and hired several techs from dealers that told me the same story over and over---They do not get the nickname "stealership" by accident---They earn it---They hit the manufacturer TOO!!! Good luck. Jimmy