jakobjohnson8
GLS Hybrid Transmission Oil Pressure Sensor Issue
Summary of the thread
A 2023 Mercedes GLS Hybrid experienced a transmission oil pressure sensor fault, leading to an engine warning light, emergency gearbox mode, slippage, unclean shifts, and grinding noises. The issue was suspected to be caused by low transmission oil or a faulty pressure sensor. It was advised to avoid driving the vehicle further and to seek professional diagnosis. The problem was resolved by replacing the faulty sensor and refilling the transmission oil at a Mercedes-Benz service center.
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4 comment(s)
jakobjohnson8 (community.author)
I appreciate the quick response I haven't directly measured the oil pressure My tool only reports the generic 'transmission oil pressure sensor fault' error code How can I test the pressure switch or sensor to see if they work before deeper work
amelie_raven3
Without live data finding the cause is hard You need a scan tool that reads the oil pressure value directly from the pressure gauge which is beyond basic checks The pressure switch is just on or off it doesn't give a pressure reading Your shifting issues suggest more than a simple sensor Given your symptoms especially the grinding don't drive it further Take it to a trusted workshop to avoid more damage
jakobjohnson8 (community.author)
Thanks for the advice I had the car taken to a Mercedes-Benz service center The diagnosis was low transmission oil and a faulty transmission oil pressure sensor The sensor was replaced the oil was refilled and the repair cost 365€ The transmission seems okay Your insights helped me decide what to do and I appreciate your help
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MERCEDES
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GLS
amelie_raven3
I had a similar issue with my GLS though it's not a hybrid The first sign was the transmission warning light Did you check the basics What does the oil pressure reading show Is it fluctuating or consistently low A faulty pressure switch could trigger a sensor fault even with correct pressure A sensor replacement might fix it Remember oil pressure acts as a pressure gauge inside your transmission and relies on the transmission sensor to show if you have enough oil pressure