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I have 2021 AT4 with the 6.2L, just recently a check engine light has come on and am a bit stumped on it. I have read the codes on the ODB11 and the reader I have shows a P2CB9 code but it give me an "information unknown" reading. My GMC app however tells me that nothing is wrong and all systems are normal. I search online and find that the P2CB9 code is a "cooling fan 2 underspeed" however I live in Canada, its -25 degrees Celsius outside and there should be no reason that cooling fan 2 needs to run, or if I need to get it to run, its too cold out to try and get it to engage. Would taking the negative battery post off reset this code? its not like its immediately urgent in my life to get it to the dealership due to im not worried about it overheating, but its blocking my command start from working and its pissing me off because its cold outside. Am I chasing the right rabbit? Thanks in advance -
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