P24A5 code on a ML2013 Bluetec
Thread Starter
Newbie
Joined: Nov 2021
Posts: 6
Likes: 0
ML 350 Bluetec 2013
P24A5 code on a ML2013 Bluetec
First post.
I have been getting a check engine light with code P24A5 (read on my phone from a cheap obd2 scanner).
when I reset the light, I can usually drive a few days before it comes back. Done this 3 times already.
code description says:
any clue if this is the egr valve or something else ?
The car runs fine with no symptoms or lack of power.
thanks for your support.
I have been getting a check engine light with code P24A5 (read on my phone from a cheap obd2 scanner).
when I reset the light, I can usually drive a few days before it comes back. Done this 3 times already.
code description says:
P24A5 Mercedes-Benz Exhaust Gas Recirculation (EGR) Cooler Bypass Control Stuck (Bank 1)
any clue if this is the egr valve or something else ?
The car runs fine with no symptoms or lack of power.
thanks for your support.
Newbie
Joined: May 2019
Posts: 7
Likes: 1
From: Philadelphia, PA
2012 ML 350 BlueTEC, 2006 C280
It sounds like the code is referring to the EGR cooler bypass valve located on the front of the engine (passenger side in US). If you look up a picture of an OM642.826 engine from the front, look for the two bent stainless steel pipes about in the middle, those are the two pipes going from the EGR cooler to the bypass valve. Recommend reading this about cleaning that assembly:
https://mbworld.org/forums/diesel-fo...-cleaning.html
EGR gasses can foul everything downstream of the cooler pretty impressively, including the bypass valve. Sounds like this could be related. Could also be something else besides actual fouling. My wife’s 2012 ML350 BT had a code for the EGR cooler bypass valve the other month (don’t remember if it was this one) and it ended up being a few holes in the vacuum hoses going to the valve. So when the valve was commanded to actuate, nothing would happen.
Hope this points you in the right direction.
https://mbworld.org/forums/diesel-fo...-cleaning.html
EGR gasses can foul everything downstream of the cooler pretty impressively, including the bypass valve. Sounds like this could be related. Could also be something else besides actual fouling. My wife’s 2012 ML350 BT had a code for the EGR cooler bypass valve the other month (don’t remember if it was this one) and it ended up being a few holes in the vacuum hoses going to the valve. So when the valve was commanded to actuate, nothing would happen.
Hope this points you in the right direction.
Senior Member
Joined: Nov 2015
Posts: 272
Likes: 49
From: Ottawa, Ontario
2013 ML350 Bluetec, 1966 Ford Mustang Convertible (sold)
Last edited by Potrice; Jul 22, 2025 at 08:14 PM.
Senior Member
Joined: Nov 2015
Posts: 272
Likes: 49
From: Ottawa, Ontario
2013 ML350 Bluetec, 1966 Ford Mustang Convertible (sold)
Quick reply! After inspecting throughly every vacuum line, I noticed one was loose and cracked. I repaired the vacuum line and erased the code. I will update if the code returns.
