Update: Dealer Repair Completed — Am I Being Overcharged?
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Update: Dealer Repair Completed — Am I Being Overcharged?
Following up on a post from about a month ago. The dealer has completed the diagnosis and repair, but the final bill and findings weren't what I expected.
Rather than burying the update in the original thread, I thought I'd start a new one and link back for context.
I'm curious whether others have seen similar repairs and whether these charges seem reasonable.
Here's the original post:
The 2020 GLC300 was repaired by the dealer, and according to the invoice, the root cause was addressed under what appears to be a Mercedes service bulletin/campaign.
Customer complaint:
Rather than burying the update in the original thread, I thought I'd start a new one and link back for context.
I'm curious whether others have seen similar repairs and whether these charges seem reasonable.
Here's the original post:
The 2020 GLC300 was repaired by the dealer, and according to the invoice, the root cause was addressed under what appears to be a Mercedes service bulletin/campaign.
Customer complaint:
- Check Engine Light illuminated
- Vehicle would not accelerate properly
- Engine stumbled/shuddered when stopped
- A CLIENT STATES: CHECK ENGINE WARNING LIGHT ON AT DASH, WILL NOT ACCELERATE, WHEN AT A STOP VEHICLE STUMBLES
- CAUSE: 541011 PERFORM QUICK TEST 350182 W (N/C)
- 476970 FUEL SYSTEM CONTROL UNIT REPLACE (AFTER CHECK) 350182 W (N/C)
- 547989 DISCONNECT/CONNECT GROUND LINEOF BATTERY FOR 12 V ON-BOARD ELECTRICAL SYSTEM (DURING REPAIR OPERATIONS) 350182 W (N/C)
- 1 000-545-01-41-64 EXCHANGE DIAGNOSTIC DEVICE
- G** SOFTWARE UPDATE NEED IT FOR CONTROL UNIT
- 55MBZ SOFTWARE UPDATE 350182 C
- G** SOFTWARE UPDATE NEED IT FOR CONTROL UNIT
- 55MBZ SOFTWARE UPDATE 350182 C
- Two separate software update entries were listed, and I was charged $325 for the software update.
- The Service Manager told me Mercedes charges separately for software updates. My response was that this seems ridiculous if a software issue can cause the vehicle to go into limp mode, illuminate the check engine light, and require repair. Why should customers pay to correct a software problem that originated with Mercedes?
- Has anyone successfully challenged a charge like this with Mercedes-Benz USA or the dealership? If so, what was your approach and what was the outcome?
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From: Milton/Westport, MA USA
me: 2015 SL400 & 2015 ML400; wife: 2022 GLC Coupe; daughter: 2017 GLC SUV
You gave a lot more info in the original post (2020 GLC300 4Matic. US model. ~78,889 miles. You are the original/sole owner) but there's still info missing:
where in the US are you? members may be familiar with the particular dealer.
did this dealer perform the required service A's and B's while the vehicle was under warranty?
did you question why you were being charged BEFORE you paid? seems like a no-brainer but....
In my experience, every dealership desparately wants a 5-star review from every customer, and typically sends an email saying that if there's anything preventing you from giving one to get in touch before completing a survey; did you get such an email?
I recall a vaguely similar situation I had several years ago: I paid about $1200 for repair of a condition that I believe had been addressed by a service bulletin at the time. Having owned several Mercedes I was very well known in the service department, and I felt that they had likely done their best on my behalf, so I reached out to MBUSA with a complaint. Turns out I was naive, as they simply forward that complaint back to the dealer, and the service manager basically bent over backwards saying he wished I had said something before I had paid, and he offered me a $500 credit on any future service. I happily accepted that.
where in the US are you? members may be familiar with the particular dealer.
did this dealer perform the required service A's and B's while the vehicle was under warranty?
did you question why you were being charged BEFORE you paid? seems like a no-brainer but....
In my experience, every dealership desparately wants a 5-star review from every customer, and typically sends an email saying that if there's anything preventing you from giving one to get in touch before completing a survey; did you get such an email?
I recall a vaguely similar situation I had several years ago: I paid about $1200 for repair of a condition that I believe had been addressed by a service bulletin at the time. Having owned several Mercedes I was very well known in the service department, and I felt that they had likely done their best on my behalf, so I reached out to MBUSA with a complaint. Turns out I was naive, as they simply forward that complaint back to the dealer, and the service manager basically bent over backwards saying he wished I had said something before I had paid, and he offered me a $500 credit on any future service. I happily accepted that.
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From: Scottsdale, Arizona
2001 E55AMG
Normal, software updates are considered a maintence item by all OEMs, and are expected to be paid out of pocket by the customer.
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
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Joined: May 2026
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- I'm in Southern California, Los Angeles. Rusnak Mercedes.
- And yes, I did get a survey email.... but never completed the survey because of this very issue.
- I did ask the service manager and he said that updates are a payable event. I then called MB USA and repeated the same and said to address with dealership. Im considering calling my Amex and filing a dispute/complaint based on evidence from social media, and this group, etc. Ergo, seeing here if I can build a case.
- Unfortunately, I had to pay as the family was heading on vacation.
You gave a lot more info in the original post (2020 GLC300 4Matic. US model. ~78,889 miles. You are the original/sole owner) but there's still info missing:
where in the US are you? members may be familiar with the particular dealer.
did this dealer perform the required service A's and B's while the vehicle was under warranty?
did you question why you were being charged BEFORE you paid? seems like a no-brainer but....
In my experience, every dealership desparately wants a 5-star review from every customer, and typically sends an email saying that if there's anything preventing you from giving one to get in touch before completing a survey; did you get such an email?
I recall a vaguely similar situation I had several years ago: I paid about $1200 for repair of a condition that I believe had been addressed by a service bulletin at the time. Having owned several Mercedes I was very well known in the service department, and I felt that they had likely done their best on my behalf, so I reached out to MBUSA with a complaint. Turns out I was naive, as they simply forward that complaint back to the dealer, and the service manager basically bent over backwards saying he wished I had said something before I had paid, and he offered me a $500 credit on any future service. I happily accepted that.
where in the US are you? members may be familiar with the particular dealer.
did this dealer perform the required service A's and B's while the vehicle was under warranty?
did you question why you were being charged BEFORE you paid? seems like a no-brainer but....
In my experience, every dealership desparately wants a 5-star review from every customer, and typically sends an email saying that if there's anything preventing you from giving one to get in touch before completing a survey; did you get such an email?
I recall a vaguely similar situation I had several years ago: I paid about $1200 for repair of a condition that I believe had been addressed by a service bulletin at the time. Having owned several Mercedes I was very well known in the service department, and I felt that they had likely done their best on my behalf, so I reached out to MBUSA with a complaint. Turns out I was naive, as they simply forward that complaint back to the dealer, and the service manager basically bent over backwards saying he wished I had said something before I had paid, and he offered me a $500 credit on any future service. I happily accepted that.
Last edited by 2020GLC4Matic; Jun 2, 2026 at 04:09 PM.
Thread Starter
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@Highline-Autos Trenton,
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
Normal, software updates are considered a maintence item by all OEMs, and are expected to be paid out of pocket by the customer.
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
SPONSOR
Joined: Apr 2021
Posts: 1,586
Likes: 478
From: Scottsdale, Arizona
2001 E55AMG
@Highline-Autos Trenton,
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
@Highline-Autos Trenton,
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
Well that certainly challenges the fortunate @Mattml430 who gets the updates gratis. Is there no standard out there on what MBUSA dictates as a policy on system upgrades, and whether to charge the customer? I mean seriously, it's plugging in a cord and running an update. How time consuming can that take a dealership's mechanic to away from other vehicles in need of repair.
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I think what occured here is you needed a new fuel control unit. That new fuel control unit needed to be programed to work with you car. It is my understanding whenever a dealer has to program a new part they must connect to the computers in Germany and this costs them or they pay a monthly yearly rate. They then charge you.
Again, I could be wrong but this is how I read the invoice.
Again, I could be wrong but this is how I read the invoice.
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@slk3202001 Appreciate the additional feedback.
This just keeps getting more and more interesting.What's really irritating now is that the check engine light has suddenly appeared on the dashboard and I'm far off in the mountains on holiday. At this point, I'm becoming pretty cynical about dealerships repairs. It almost makes you wonder whether a vehicle can leave the shop with new issues that somehow weren't there before. I'm not saying that's what happened here, but the timing certainly isn't doing much to inspire confidence.
This just keeps getting more and more interesting.What's really irritating now is that the check engine light has suddenly appeared on the dashboard and I'm far off in the mountains on holiday. At this point, I'm becoming pretty cynical about dealerships repairs. It almost makes you wonder whether a vehicle can leave the shop with new issues that somehow weren't there before. I'm not saying that's what happened here, but the timing certainly isn't doing much to inspire confidence.
MBWorld Fanatic!
Joined: Oct 2009
Posts: 7,057
Likes: 2,214
From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
@slk3202001 Appreciate the additional feedback.
This just keeps getting more and more interesting.What's really irritating now is that the check engine light has suddenly appeared on the dashboard and I'm far off in the mountains on holiday. At this point, I'm becoming pretty cynical about dealerships repairs. It almost makes you wonder whether a vehicle can leave the shop with new issues that somehow weren't there before. I'm not saying that's what happened here, but the timing certainly isn't doing much to inspire confidence.
This just keeps getting more and more interesting.What's really irritating now is that the check engine light has suddenly appeared on the dashboard and I'm far off in the mountains on holiday. At this point, I'm becoming pretty cynical about dealerships repairs. It almost makes you wonder whether a vehicle can leave the shop with new issues that somehow weren't there before. I'm not saying that's what happened here, but the timing certainly isn't doing much to inspire confidence.
If it's flashing, it's urgent.
I invested in a code reader, LAUNCH CReader Mercedes, to analyze my car and any warning lights.
Often they settle themselves after a restart, and the codes are stored.
