leonielight7

Mini Cooper starting issue Terminal 30 message

My 2008 Mini Cooper diesel is playing up. It's starting poorly and I'm seeing 'Terminal 30 continuous plus interrupted' on the dash. I suspect a heavily discharged battery but could it be something else? I've checked the obvious stuff like loose connections but no luck so far. Any ideas?

4 comment(s)

Sounds like a pain. I had something similar with my Cooper not long ago. Check for any voltage drop across the fuse box, especially around the terminals. Could also be a dodgy connection in the wiring harness. Is the starter motor turning over okay, or is it sluggish?

Voltage drop is something I can test with a multimeter I guess? When you say terminals, are there any specific ones I should be looking at? The wiring harness looks okay on a quick visual check, but I didn't take it apart.

Yeah, multimeter is your friend. I'd focus on the main power terminals in the fuse box first. Give them a wiggle, see if the voltage fluctuates. I had a corroded terminal that was causing intermittent issues. If it's not that obvious, get it to a workshop. Electrical gremlins can be a nightmare.

Update for anyone else having this weirdness. Took the Mini to a garage. They confirmed the battery was shot and replaced it. Cost me 290€. They checked the charging system too and said all good. Hopefully, that's the end of it.

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