Velsatis Bypass Valve and Overheating

I also drive a VelSatis with a similar diesel engine, though a slightly newer model. I experienced comparable symptoms some time ago. I received the same error code related to the bypass valve, which initially seemed like the core issue. I did notice that the engine temperature was running higher than usual, and I was concerned about potential damage. Did you check the usual suspects?

Thanks for the quick reply. When you say 'usual suspects', could you elaborate on which specific components or systems I should be focusing on? I want to be thorough before consulting a technician.

In my case, the bypass valve error was a consequential error. The root cause, surprisingly, was a minor issue with the thermostat, preventing proper coolant circulation. This, in turn, caused the engine to run hotter, triggering the bypass valve error as a protective measure. Given your vehicle's age, it might be prudent to have the cooling system and related sensors thoroughly checked by a qualified workshop. It could save you from chasing the wrong issue.

I appreciate you explaining that the bypass valve error might be a symptom rather than the primary fault. Following your advice, I took my vehicle to a trusted workshop, and you were correct! It was indeed a faulty thermostat causing the overheating, which in turn triggered the bypass valve error. The repair involved replacing the thermostat, costing 0€, as it was covered by a service package. Thanks again for your guidance!