I don't know whether it is still current info since I have been out of the automotive industry for several years, but at one time PRR stood for GM's Problem Reporting & Resolution system. This was a computer-based system where GM locations could initiate the PRR electronically, and the supplier could respond with the results of the corrective action.
Miner is correct (as usual), unless there's some other weird PR&R out there. It is (or was) GMs' supplier corrective action system, and when I was dealing with them in the late 90s it was invoked across a Telnet connection. It was slow and quirky and had to be accessed daily to see if there were any messages or PR&Rs to be dealt with. If there was a problem with GM's complaint, you then had to try and find someone on the phone to deal with it, which could take days. This meant that many bogus PR&Rs were just accepted and answered rather than risking another PR&R for late response. It was a large part of GM's mindless and tyrannical methods for dealing with suppliers.
I assume, from your response, that GM does not have a formal system for PRR disputes. As a new GM direct supplier, we received a duplicate PRR. I am not aware of any way of challenging the PRR, other than calling GM and getting lost in their system.
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