2012 Mercedes ML350 Bluetec diesel losing power when driving up hill
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2012 Mercedes ML350 Bluetec diesel losing power when driving up hill
HI everyone,
Reaching out for some advice.
I own 2012 Mercedes ML350 BlueTEC. It was running fine and lately, started encountering a problem while driving.
When driving on the motorway, the car performs fine on flat terrain. Occasionally, as soon as I start going uphill, the power drops significantly and seems to stay that way for a long period of time
The only way it goes back to its normal mode is if I pull up, switch off the engine and restart in about 5 minutes. Then it goes back to normal driving.
This has happened quite a few times now over the last month. I had sent it to a workshop and the computer could not diagnose any fault. They even kept it for a week and drove it around and it did not happen.
This does bother me. Hope someone will be able to provide some advice. This will be greatly appreciated.
Kind regards
Carl
Reaching out for some advice.
I own 2012 Mercedes ML350 BlueTEC. It was running fine and lately, started encountering a problem while driving.
When driving on the motorway, the car performs fine on flat terrain. Occasionally, as soon as I start going uphill, the power drops significantly and seems to stay that way for a long period of time
The only way it goes back to its normal mode is if I pull up, switch off the engine and restart in about 5 minutes. Then it goes back to normal driving.
This has happened quite a few times now over the last month. I had sent it to a workshop and the computer could not diagnose any fault. They even kept it for a week and drove it around and it did not happen.
This does bother me. Hope someone will be able to provide some advice. This will be greatly appreciated.
Kind regards
Carl
MBWorld Fanatic!
Joined: Jan 2016
Posts: 2,749
Likes: 881
From: In the Shadow of the Tetons
2013 ML350 Bluetec
Sounds like it is going into limp mode.
Limp mode will set a code.
You might need a better code reader than a cheap one, but there's one to be found when it happens.
Unless you're just running out of fuel.
Limp mode will set a code.
You might need a better code reader than a cheap one, but there's one to be found when it happens.
Unless you're just running out of fuel.
Newbie
Joined: Nov 2024
Posts: 1
Likes: 0
i have the same problem on a 2013. had my massflow sensor, fuel filter, and DPF replaced. still doing it.
QUOTE=caz88r;9047500]HI everyone,
Reaching out for some advice.
I own 2012 Mercedes ML350 BlueTEC. It was running fine and lately, started encountering a problem while driving.
When driving on the motorway, the car performs fine on flat terrain. Occasionally, as soon as I start going uphill, the power drops significantly and seems to stay that way for a long period of time
The only way it goes back to its normal mode is if I pull up, switch off the engine and restart in about 5 minutes. Then it goes back to normal driving.
This has happened quite a few times now over the last month. I had sent it to a workshop and the computer could not diagnose any fault. They even kept it for a week and drove it around and it did not happen.
This does bother me. Hope someone will be able to provide some advice. This will be greatly appreciated.
Kind regards
Carl[/QUOTE]
QUOTE=caz88r;9047500]HI everyone,
Reaching out for some advice.
I own 2012 Mercedes ML350 BlueTEC. It was running fine and lately, started encountering a problem while driving.
When driving on the motorway, the car performs fine on flat terrain. Occasionally, as soon as I start going uphill, the power drops significantly and seems to stay that way for a long period of time
The only way it goes back to its normal mode is if I pull up, switch off the engine and restart in about 5 minutes. Then it goes back to normal driving.
This has happened quite a few times now over the last month. I had sent it to a workshop and the computer could not diagnose any fault. They even kept it for a week and drove it around and it did not happen.
This does bother me. Hope someone will be able to provide some advice. This will be greatly appreciated.
Kind regards
Carl[/QUOTE]
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Member
Joined: Aug 2016
Posts: 126
Likes: 47
From: Toronto
2013 Mercedes GL350 Bluetec (X166) & 2019 Mercedes A220 (W177) & Retired 2008 Mercedes C300 (W204)
Did you have any error codes when scanned when the issue occurs?
If boost pressure related, look at both of the intercooler hoses for leaks or tears on the left and right. They may visually look in good shape but a slight squeeze on the hose may reveal cracking = leaks. Also, check around the ends of the intercooler hose connections, these are prone to tears and leaks causing the vehicle to go into limp mode.
Even better, if you have the Field Measure or AEM recall done, these intercooler hoses are covered under the warranty and will be replaced at no cost at the dealer. They do need to be OEM Mercedes part and not aftermarket replaced part to be covered.
If boost pressure related, look at both of the intercooler hoses for leaks or tears on the left and right. They may visually look in good shape but a slight squeeze on the hose may reveal cracking = leaks. Also, check around the ends of the intercooler hose connections, these are prone to tears and leaks causing the vehicle to go into limp mode.
Even better, if you have the Field Measure or AEM recall done, these intercooler hoses are covered under the warranty and will be replaced at no cost at the dealer. They do need to be OEM Mercedes part and not aftermarket replaced part to be covered.
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