I have '11 ZF1 Base 6MT 72k. Just had a P1448 DTC. I noticed a day or 2 prior the IPU fan was ON more than usual and louder than normal. I got a IMA light, check engine light, and message about the IMA but cant remember what it was. I finished my drive and after the next start no IMA light or message just check engine illuminated. Got home ran the code. Checked the forum for similar experiences. Ordered a new IPU fan and installed it. Cleared the code with my diagnostic tool and reset the 12v battery. So far so good.