Boxer Overheating Communication Error

I recall a similar issue with a 2014 Volvo XC60. The symptoms you describe – overheating, check engine light, coolant expulsion – point towards potential issues within the engine management system. Have you scanned the vehicle for diagnostic trouble codes (DTCs)? A fault in the CAN bus system or a software glitch within a control module could be the culprit. Before hardware replacements, check the error codes. What codes are you seeing?

I have scanned the vehicle and am receiving a persistent error code related to control unit communication. Given your experience with the Volvo XC60, could you elaborate on the specific control modules or areas within the CAN bus system that you investigated, and what your diagnostic approach was?

In the Volvo's case, the error was intermittent and pointed towards the engine control module (ECM). We initially suspected a software glitch or corrupted firmware. However, after extensive diagnostics, including CAN bus testing with an oscilloscope, we traced the problem to a corroded connector on the transmission control module (TCM), which was disrupting communication across the network. Given the age of your Boxer, I would recommend a thorough inspection of all control module connectors and wiring harnesses. Check for corrosion, loose connections, and damaged wiring. Without specialist diagnostic tools, it’s difficult to pinpoint the exact source. Your error code clearly indicates a communication issue, so I would recommend taking it to a workshop.

Based on your recommendation, I inspected the connectors and found a slightly corroded connection on the engine control unit. Cleaning the connector resolved the issue, and the error code has cleared. Total cost was 95€ at my local mechanic. I appreciate your help in guiding me towards the likely cause.