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Old 10-02-2019, 11:24 AM   #1
graf101's Avatar
Drives: 15' RRM/2SS/1LE
Join Date: Jan 2015
Location: Arlington, TX
Posts: 401
PCS TCM-2800


I have an auto swap on my 2015 1LE, which has a separate PCS TCM-2800 transmission controller.

The factory battery had been on the fritz for a while, and finally gave up this past weekend. I replaced it with another AC Delco factory battery and the car fired right up, as it should.

The issue is that since the new battery was installed, the PCS TCM controller does not seem to be powering on, which places the transmission into limp mode, where it will only stay in 2nd gear.

I have checked all or most fuses in the front passenger side fuse box, rear passenger side fuse box, and the driver side fuse panel. All fuses appear to be ok, and unbroken. Any ideas or something that I am missing here? I do know that the PCS tcm has a harness that is directly wired to the front passenger fuse box.

Any help or ideas are appreciated.
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Old 10-02-2019, 11:33 AM   #2
Vegas Bound

Drives: 2013 Sparkly Red One
Join Date: Dec 2018
Location: Hospitality State
Posts: 2,299
Who did your install? Maybe there is an inline fuse near the TCM. Do you know where your TCM was mounted? Mine is in the passenger foot well under the carpet.

Did you install the TCM programming software on a laptop? It is free from the PCS website. I check and modify my programming often depending on track and atmospheric conditions.
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