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TCM or PCM or just SOS!

 
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  #1 (permalink)  
Old 16 May 2016, 10:11 am
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Default TCM or PCM or just SOS!

Our 2006 is acting weird once again and this time the codes seem to point to the TCM. Symptoms are: battery keeps getting drained (battery has been checked over and over and tested good) then we get a low voltage code for the TCM.

Then, sometimes, when it's apparently mad at us, it goes into limp mode. We disconnect the battery to clear the codes and sometimes it's good for as long as two weeks, sometimes it goes back to flashing battery and/or check engine light codes that same day. (Did the turn key code trick but got no codes that way.)

Took off the battery box and looked at all the cables and they seemed clean and in good condition. We don't know exactly how to test those cables, but if someone baby-walks us through it, we'll try.

I know that the PCM might be bad, but I don't know how to test for sure or who might be able to test it for us to get a certain reading. (Although, at this point, I might just buy one and put it in and hope for the best.)

Any thoughts before I take it to the mechanic and be sad?
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  #2 (permalink)  
Old 16 May 2016, 12:57 pm
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Join Date: Jan 2014
Location: SW PA
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Default Re: TCM or PCM or just SOS!

I aint't no tranny man but to try something, check the connector that goes into the transmission for water or oil which could be causing you problems. Again I'm guessing and what I'm suggesting is not easy because removal of the battery tray and possible its metal mount under neath requires patience.

Good luck.. I'd also check each wire in that harness to the ground on left fender. But my thoughts are if it works again for two weeks after you disconnect the battery....

Hope someone else comes along that knows more that Me to help you.
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  #3 (permalink)  
Old 16 May 2016, 02:45 pm
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Join Date: May 2016
Posts: 258
Default Re: TCM or PCM or just SOS!

Quote:
Originally Posted by flafishergal View Post
Our 2006 is acting weird once again and this time the codes seem to point to the TCM. Symptoms are: battery keeps getting drained (battery has been checked over and over and tested good) then we get a low voltage code for the TCM.

Then, sometimes, when it's apparently mad at us, it goes into limp mode. We disconnect the battery to clear the codes and sometimes it's good for as long as two weeks, sometimes it goes back to flashing battery and/or check engine light codes that same day. (Did the turn key code trick but got no codes that way.)

Took off the battery box and looked at all the cables and they seemed clean and in good condition. We don't know exactly how to test those cables, but if someone baby-walks us through it, we'll try.

I know that the PCM might be bad, but I don't know how to test for sure or who might be able to test it for us to get a certain reading. (Although, at this point, I might just buy one and put it in and hope for the best.)

Any thoughts before I take it to the mechanic and be sad?
Are you saying you did the key scan correctly and you didn't get any codes? At a minium, i believe if it was done correctly, you should have gotten a atleast one code indicating the battery has been disconnected within the last 10 times the vehicle was started. If the battery was disconnected and you didnt get any codes, i would recommend going to a parts store and having them scan it. Maybe your onboard system isn't working. Just a guess thou.
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Old 16 May 2016, 02:48 pm
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Join Date: May 2016
Posts: 258
Default Re: TCM or PCM or just SOS!

i think the P code is P1684 and its 50 starts. So, if you had your battered disconnected to test and didn't get that code, i'd redo the check or take it somewhere...hope it gets you started in the right direction.
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Old 16 May 2016, 02:58 pm
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Join Date: Dec 2010
Posts: 23
Default Re: TCM or PCM or just SOS!

The code indicating the TCM was told to us by the guy at the auto parts place using his tester just this past weekend. We haven't disconnected the battery since then.

But that was also the code that we got at Autozone about a month ago when this all started happening.

When I tried to get the key click code, I only get dashed lines and the "done" remark on the dash.
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Old 16 May 2016, 03:25 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
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Default Re: TCM or PCM or just SOS!

I would suggest buying an OBDII Scan Tool. This will ensure you are getting all the engine trouble codes.

I would suggest having a battery load test done with the battery in the PT Cruiser. On one of my PT Cruisers I put a new battery in it every year. The TIPM is sensitive to any voltage drops and will give you random codes such as P0700, P0480, loss of communication codes, etc.

Check your battery cable connections. Make sure they are clean. Make sure you have good continuity in the cables.

The 2006 & 2007 are very popular years for the TIPM to become faulty. I would suggest making sure all fuses are tight in the TIPM. When my battery needs attention it gives me the flashing battery lights and the dancing gauges on my 2007 PT Cruiser.
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Old 16 May 2016, 04:32 pm
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Join Date: May 2016
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Default Re: TCM or PCM or just SOS!

Quote:
Originally Posted by ptcruisersteve View Post

Check your battery cable connections. Make sure they are clean. Make sure you have good continuity in the cables.

The 2006 & 2007 are very popular years for the TIPM to become faulty. I would suggest making sure all fuses are tight in the TIPM. When my battery needs attention it gives me the flashing battery lights and the dancing gauges on my 2007 PT Cruiser.
Started experiencing this myself this year. Swapped battery and terminal ends and it fixed mine. Hope this is all you need!
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Old 25 May 2016, 08:45 am
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Default Re: TCM or PCM or just SOS!

Well, just to be safe, we installed a new battery. Was fine for a few days, then after driving about an hour, check engine light came back on and car went into limp mode. Since we were far from home, we took off the battery cable to clear things and all was fine. Drove back home another hour with no problems.

What is a next logical step?
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  #9 (permalink)  
Old 25 May 2016, 08:53 am
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Default Re: TCM or PCM or just SOS!

The only thing I need to say..
disconnecting the battery only removes the warning light. The PCM will hold the issue until it is resolved. So really by doing the battery disconnect you are creating longer times to diagnose and fix any PCM monitored issue!


This has always been really bad internet information about disconnecting battery to clear engine diagnostic codes numbers? People need to really look at the few years that this worked. Like back in the early 90's.
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Last edited by NitroPT; 25 May 2016 at 08:55 am.
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  #10 (permalink)  
Old 25 May 2016, 09:06 am
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Join Date: Dec 2010
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Default Re: TCM or PCM or just SOS!

I understand that disconnecting the battery isn't the first choice here, but I had to get home somehow.

Actually, the other day the CEL came on and it went into limp mode. I stopped at the store, parked, got back in an hour or so later and the CEL light was gone and so was the limp. I didn't disconnect the battery or do anything.

I'm in the processing of selling this car and I really need to figure out this bizarre behavior.
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