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Hello everybody
I have a 2008 Mercedes GL450, and I've had my engine rebuilt at a shop, and they managed to fry my ECU. They told me that they're gonna get me a new ECU, and I said ok. After a year or so I discovered that the ECU they got me wasn't for my car, and they somehow got the car started with it. After a year, the car started running significantly worse. Until last month, the car turned into a crank, then started for a couple of seconds, then died, and each time I tried again, it got worse until it became a crank no start with backfire while cranking. When I scan the codes, the only code I was getting was P0607 module performance. I took it to a shop, and they said that the ECU is not for the car, and it is the problem, and I need a new ECU. I bought a junkyard one from eBay, and it'll be here in a day or two. I want to know if I bought a cheap scan tool with a budget of 500$, can I program the ECU myself? Did this story make sense, and is the ECU really the problem here?
Hello everybody
I have a 2008 Mercedes GL450, and I've had my engine rebuilt at a shop, and they managed to fry my ECU. They told me that they're gonna get me a new ECU, and I said ok. After a year or so I discovered that the ECU they got me wasn't for my car, and they somehow got the car started with it. After a year, the car started running significantly worse. Until last month, the car turned into a crank, then started for a couple of seconds, then died, and each time I tried again, it got worse until it became a crank no start with backfire while cranking. When I scan the codes, the only code I was getting was P0607 module performance. I took it to a shop, and they said that the ECU is not for the car, and it is the problem, and I need a new ECU. I bought a junkyard one from eBay, and it'll be here in a day or two. I want to know if I bought a cheap scan tool with a budget of 500$, can I program the ECU myself? Did this story make sense, and is the ECU really the problem here?
Programming a used ECU all the way from scratch is not a casual 1-2-3-task like transferring used ECU coding into a replacement.
Contact forum expert @BenzNinja to finally get your coding done professionally.
The condition that fried prior ECU and that is causing current "crank-no start" issue can also get diagnosed by @BenzNinja ... (perhaps a fuel pump low pressure or ignition fuse ??)
Last edited by CaliBenzDriver; Nov 1, 2025 at 03:05 AM.
Hello everybody
I have a 2008 Mercedes GL450, and I've had my engine rebuilt at a shop, and they managed to fry my ECU. They told me that they're gonna get me a new ECU, and I said ok. After a year or so I discovered that the ECU they got me wasn't for my car, and they somehow got the car started with it. After a year, the car started running significantly worse. Until last month, the car turned into a crank, then started for a couple of seconds, then died, and each time I tried again, it got worse until it became a crank no start with backfire while cranking. When I scan the codes, the only code I was getting was P0607 module performance. I took it to a shop, and they said that the ECU is not for the car, and it is the problem, and I need a new ECU. I bought a junkyard one from eBay, and it'll be here in a day or two. I want to know if I bought a cheap scan tool with a budget of 500$, can I program the ECU myself? Did this story make sense, and is the ECU really the problem here?
No, you cannot program that ECU yourself with a $500 scan tool. It requires specialized Mercedes software like DAS or Vediamo that only professional shops have. The security coding to pair it to your car is a dealer-level job.
Your story makes perfect sense. A wrong ECU will cause exactly the problems you described. The junkyard ECU is the right first step, but you will need a qualified Mercedes specialist to program and install it for you. Don't waste your money on a cheap scanner.
Strange that it was seemingly working fine for a year until now. Looking up the P0607 code its showing three scenarios. Two say replace ECU and the third shows all types of testing.
For info on the ECU go to Powertrain management > Computers and control systems > Engine control module. There a some TSB's though they may not apply to your situation.
For the codes go to the top selection A L L Diagnostic Trouble Codes (DTC).
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Mercedes GL450 ECU
