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Old 03 Dec 2017, 05:30 pm
katydidindeed katydidindeed is offline
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Join Date: Jan 2002
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Posts: 5
Default 2001 PT Limited Auto Transmission - Error Codes p1684 and p0700 went into limp mode

I have a 2001 PT Limited that I love and to keep it decided to replace its' transmission back in 11/2012. It has been great since. I don't drive that often, once or twice a week on local jaunts, so it sits idle most of the time. I replaced the battery 08/16 with the least expensive model from Walmart (due to budget constraints). The battery has a 1 year guarantee. Last week when I went for a short trip, the car went into limp mode and the check engine light came on less than 1/2 a mile from home, so I turned around and came back. Checked the codes - P1684 and P0700. Later that day I started searching for ideas as to what the problem might be and finally decided to add some ATF+4 fluid to see if that would fix it. The existing fluid was still nice and red and clean, but it was a little low, so I added about 1/3 of a quart. Then I took a short trip to check if that helped... no limp mode and the transmission worked fine. I was going to take it to the shop a few days later just to confirm, but the next day I had to take another short trip to the grocer and when I started the car to go back home, the check engine light had disappeared. So I checked the codes and they were gone as well. While I do think the additional fluid was necessary, I am curious if the battery may be losing steam and triggered an issue with the TCM that caused a false positive and forced the limp mode. The battery alert has not been coming on to indicate an issue, but since I drive so infrequently, I was trying to figure out why the P1684 code. Thoughts?! Regardless, my 17 yr old car is still chugging away and I'd like to keep it that way. If I should get a better battery let me know. Thanks, this forum has saved me a bunch of money and kept my PT Cruising!

Last edited by katydidindeed; 03 Dec 2017 at 06:06 pm.
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