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Old 07-16-2019, 10:55 PM
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Bob Bates Bob Bates is offline
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I forgot to add that my 2011 X5D goes into reduced power mode when pulling my trailer at high altitude. Did not seem to be related to outside air temperature but climbing only at high altitude. I asked on another forum and was told it because BMW seems to have gotten the programming wrong for high altitude. at first I cleared the engine fault code and it never came back until high altitude again. Since then I found the fault code clears itself after normal shut down. I got no transmission code or any other warning except "possible imminent engine failure and car is in reduced power mode. It is okay to keep driving and take it to a BMW dealer at next opportunity".
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