What do you mean sometimes it does not come on - no lights?? If that’s the case I’d guess faulty device or the OBD pins in the device aren’t making correct contact.I got the right one. Sent it back because mine was old and they loaded new code (17 Tahoe). Still does not work right. Sometimes it comes on and sometimes it does not. Emailed Range and they said they would send me a knew one. Three emails later. Not a word from Range. Nice waist for a couple hundred bucks.
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