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Posted: Wed Feb 12, 2020 12:24 pm
by boscoe
Hey everyone, anybody know what's up with a U1073 code," bus off" ? I have intermittent exclamation but car seems to drive OK. Thanks

Re: U1073

Posted: Wed Feb 12, 2020 6:38 pm
by kiev
That is a DTC to indicate a CAN Buss error, in that the EVCU thought the CAN buss was OFF.

What is the condition of your 12V aux battery? An old, weak, or worn out aux battery can cause a multitude of errors including spurious faults of the CAN Buss.

Re: U1073

Posted: Thu Feb 13, 2020 1:32 pm
by boscoe
Hey Kiev, yeah that car was just in the dealer to replace the vacuum pump. They indicated the battery (aux) was ok but, i know it is old. I'll try changing out,see if improves. Thanks for the reply!