IrisRacer
Hyundai i40 Terminal 30 Error
Summary of the thread
A 2011 Hyundai i40 with low mileage is experiencing a 'Terminal 30 continuous plus interrupted' error, leading to poor starting as if the battery is dead. The issue may be caused by a short circuit, ignition switch problems, a faulty fuse box, or a voltage drop. A parasitic draw was suggested as a potential cause, and it was recommended to check the battery's resting voltage and inspect fuses and relays. Ultimately, the problem was resolved by replacing a heavily discharged and defective battery.
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4 comment(s)
IrisRacer (community.author)
Thanks for the tip! Battery voltage does drop overnight. When you say 'parasitic draw,' could that really cause this 'Terminal 30' thing? And which fuses in particular should I be checking, the main ones in the engine bay, or also the ones under the dash?
elias_huber49
Yes, a parasitic draw can certainly cause that error. 'Terminal 30' generally refers to the continuous power supply, which the battery provides. A significant drain overnight is a strong indicator. Given the symptoms, I'd advise taking it to a workshop with the appropriate diagnostic equipment. Diagnosing electrical faults can be tricky without the right tools.
IrisRacer (community.author)
I appreciate the confirmation. I bit the bullet and took it to a local garage. Turns out, the battery was heavily discharged AND defective – go figure! New battery and a good check over sorted it. Cost me 290€ all in. Thanks again for pointing me in the right direction!
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HYUNDAI
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I40
elias_huber49
I had a similar issue with my old BMW 3 Series, though the error code was slightly different. Suspect a parasitic draw somewhere in your system. Have you tested the battery's resting voltage after the car has been sitting overnight? A significant drop would indicate a drain. Check all fuses and relays meticulously.