Yesterday, the wife was starting the Jeep to run an errand and the CEL came on; ran the code today when I was at work and it equates to a Torque Converter Clutch failure (Factory Service Manual actually states TCC/PTU). Now, I'm not overly familiar with automatic trannys but I fail to see how the torque converter clutch is failing on startup. So, my first question is, what does a failed TCC mean? Tranny rebuild (which would suck because I just did a full filter/fluid service on it - pan drop, not flush)? Also, what is the PTU? I know from Mitsubishi's the PTU is the Power Transister Unit which is ignition related; I'm not sure in what regard Jeep is using for this abbreviation (I didn't take the time to look it up in the book - I know, now I'm being lazy - sorry) and how it relates to the transmission. Third, is this failure more common to be a module failure or a trans issue? Is it safe to drive on until I can get the problem fixed (the code was cleared when it was run, it has not come back on as of yet and has been started 5 additional times since it was cleared)? I did some searching on the forum but did not come up with much (a few XJ issues but I do not know the compatibilities between an XJ and a WJ - I'm a bit of a Jeep noob). Anyhow, any info or advice would be greatly appreciated and I think you in advance for your time to read this.
2001 Jeep Grand Cherokee Limited 4x4 4.7L Quadra Drive 545RFE trans with ~120k miles.