karlbauer1
Hyundai i20 Automatic Transmission Fault
Summary of the thread
A 2017 Hyundai i20 diesel with 198,840 km is experiencing intermittent check engine and transmission indicator lights, along with gearbox slippage, unclean shifts, and grinding noises during gear changes. Diagnostic scans indicate a transmission malfunction, likely due to a defective automatic transmission converter. Suggested solutions include checking the transmission fluid level and consulting a workshop for a potential torque converter issue, as ignoring it could lead to more extensive and costly transmission damage.
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4 comment(s)
karlbauer1 (community.author)
I also noticed a slight engine surge accompanying the transmission issues. I will check the transmission fluid level as you suggested, though I suspect the underlying issue may be more complex, given the grinding noises and stored error codes. Could you please elaborate on the nature of the issue you encountered with your i20's automatic transmission? Any further insights would be greatly appreciated.
TobiMai
Those error codes and grinding don't sound great. Turns out my 'engine surge' was the torque converter starting to fail, the lock-up clutch to be precise. A torque converter is a type of fluid coupling, which allows the engine to spin somewhat independently of the transmission. The lock-up clutch is there to improve efficiency at cruising speed. Get it to a workshop, because if it's the same for you, it won't get better on its own. A new converter might be pricey but driving it as is could end up costing you much more in the long run by damaging the whole transmission.
karlbauer1 (community.author)
The diagnosis was confirmed and the repair cost came to 2120€. Thank you again for your help in identifying my issue!
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HYUNDAI
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I20
TobiMai
I had something similar happen with my i20, though I didn't get any grinding noises - that sounds rough! The engine was surging a bit, almost like it couldn't decide what gear it wanted to be in. Do you get that too? For me, it turned out to be something related to the auto transmission. I'm no expert, but maybe it's worth checking the transmission fluid level, as that's easy to do.