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Grandeur transmission issues

My 2011 Hyundai Grandeur diesel with 199,000 km is showing an engine warning light, sometimes with a transmission warning light. Error memory says faulty transmission oil temperature sensor. Gearbox occasionally goes into emergency mode, with slipping, unclean shifts, and grinding. Could low gearbox oil be the cause? Has anyone seen this before? Is it just a sensor or something worse?

Summary of the thread

A 2011 Hyundai Grandeur diesel with 199,000 km was experiencing engine and transmission warning lights, with symptoms like slipping, unclean shifts, and grinding. The error memory indicated a faulty transmission oil temperature sensor. The issue was traced to low transmission oil, which likely caused the sensor to malfunction. After refilling the oil and replacing the sensor, the warning lights disappeared, and the vehicle's shifting improved significantly.

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4 comment(s)

jonaslorenz1

That sounds rough! A faulty sensor could cause those issues, but the slipping and grinding are worrying. Emergency mode too? Have you checked the transmission fluid level yourself? Is it dark or burnt smelling?

CZimmer (community.author)

I haven't checked the fluid level yet, but even if it's low, would that throw the sensor off, or is the sensor failing because of the low fluid? Is the sensor genuinely kaput?

jonaslorenz1

Low fluid can definitely affect the sensor reading. It's possible the low level is causing the sensor to overheat or not read correctly. Sensors do fail, but with those symptoms, I'd seriously consider getting it checked at a workshop ASAP. Don't want to risk damaging your transmission further!

CZimmer (community.author)

I checked the transmission oil level, and it was indeed too low. I filled it, and the warning lights disappeared. I had the sensor replaced at the workshop, and they confirmed that low oil was likely the culprit, possibly damaging the sensor. It cost me 365€. It shifts like a dream now!

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HYUNDAI

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GRANDEUR