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Discussion Starter · #1 ·
Hi All,
Late last year I took my GLC250D into a Mercedes dealership in Brisbane for a brake and disc change. While the dealer had the car they decided to perform an ECU software update as part of a recall. After taking back take the car, I noticed the fuel economy was poorer. Before the software update I was consistently achieving 7.5L/100km around the city. Now, its hard to get anything less than 9.5L/100km even if with the most efficient driving. In addition there is an increase in the usage of the Adblue.

Its now just over a year since the ECU software update and I am still only getting the mid 9s/100km. I am wondering how many other GLC owners in Australia have had their ECU updated by the factory and are experiencing similar worse fuel economy.

I have read there a number of class action in the UK against Mercedes for this software update. I am wondering there is anything similar being done in Australia. Or what other options we have for a fix.
 

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That in my opinion that is low was just considering that your average temp must be around 20 C on a poor day My GLC22d returns around 42 MPG Imperial North east of Scotland. I would have a word with the dealer, my other question has the fuel companies been faffing around with the diesel speck. This happened in the UK with the Agri Diesel and caused all sort of problems they had increased the % of Bio, the usual results did nothing for the farming industry but the lawyers did all right.
I did not join the class action because my Mercedes is Euro 6 ie has add blue.
temps in northern Scotland ranges from 6 C to a very hot summer's day 24 C.

Iain
 

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Discussion Starter · #3 ·
That in my opinion that is low was just considering that your average temp must be around 20 C on a poor day My GLC22d returns around 42 MPG Imperial North east of Scotland. I would have a word with the dealer, my other question has the fuel companies been faffing around with the diesel speck. This happened in the UK with the Agri Diesel and caused all sort of problems they had increased the % of Bio, the usual results did nothing for the farming industry but the lawyers did all right.
I did not join the class action because my Mercedes is Euro 6 ie has add blue.
temps in northern Scotland ranges from 6 C to a very hot summer's day 24 C.

Iain
Thanks for your post Ian. Yes, I am trying to contact the dealership but they don’t appear interested in assisting. I am not surprised! I will keep trying.
Your 42MPG is an awesome. I guess your car ECU software is original from factory?
 
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