How to Diagnose DTC Codes U10388 and U11600 in a 2012 Mercedes E350?
Asked Jun 11, 20180 views2 answers
I recently purchased a 2012 Mercedes E350. The battery is in good condition (I checked it), and I have replaced the starter relay. All fuses are functioning properly. I also have an OBD II tester, which is showing two diagnostic trouble codes (DTCs): U10388, indicating a diagnostic CAN communication malfunction (Bus off), and U11600, which suggests a Bus keepawake unit was detected. All electronics in the car are operational. However, I should mention that this vehicle had flood damage. I checked under the carpet, and everything looks fine. I need help diagnosing these issues.
Understanding the Issue with Your 2012 Mercedes E350
You’ve made a significant purchase with a 2012 Mercedes E350, but it seems you're facing diagnostic challenges, particularly with the DTC codes U10388 and U11600. Let's break down these codes, their implications, and how to address the underlying issues, especially considering the vehicle's history of flood damage.
Diagnostic Trouble Codes (DTCs)
-
U10388 - Diagnostic CAN Communication Malfunction (Bus Off)
- This code indicates a failure in the communication network of your vehicle. Essentially, the Controller Area Network (CAN) is not functioning properly, which can prevent modules from communicating.
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U11600 - Bus Keepawake Unit Detected
- This code suggests that a unit designed to keep certain systems awake (like the battery management system) is either malfunctioning or not communicating effectively.
Potential Causes
Given the flood damage history, several components may be compromised:
- Electronic Control Unit (ECU)/Engine Control Module (ECM): The ECU is crucial for communication between various vehicle systems. Water exposure can lead to corrosion or short-circuiting.
- Wiring Harness: Flooding can damage the wires that connect various sensors and control units.
Expert Answers
RD
Relly De Jesus
Answered Jun 11, 2018
It sounds like you're dealing with a tricky situation with your 2012 Mercedes E350. Given the diagnostic codes you mentioned, it seems like there could be an issue with the ECU/ECM. If the ECU has been exposed to water, especially during a flood, it could be damaged, leading to communication failures. I recommend checking the ECU's condition thoroughly. It's typically located under the hood in the engine compartment, and you might find it necessary to remove some components to access it.
If the ECU isn't visibly damaged, it’s worth inspecting the wiring harness connected to it. Sometimes, the wiring can short out, especially if it was affected by water. You mentioned that you pulled some fuses and didn’t find corrosion, which is a good sign, but keep an eye out for any signs of wear or damage in the wiring itself.
Since you’re also experiencing issues with the starter, it’s crucial to address that as well. If the #7 starter fuse keeps blowing, there might be a short in the wiring harness or an issue with the starter itself. If you haven’t already, consider checking the crankshaft position sensor too. A faulty sensor can prevent the engine from starting, as it plays a key role in determining the engine's position and speed.
Once you receive your Star Diagnostic system, you’ll have a better chance of pinpointing the exact issue. If you can, try to get a replacement ECU from a salvage yard, as that could resolve the communication problems. If all else fails, and you’re still having trouble, it might be worth consulting a professional who specializes in Mercedes vehicles. They can provide more targeted assistance, especially with the complex electronics involved.
RD
Ramy De Jesus
Answered Jun 11, 2018
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