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Latitude Engine Overheating Communication Error

I'm having a perplexing issue with my 2014 Renault Latitude with a gasoline engine. It's showing symptoms of a control unit communication error. The engine is overheating, and the check engine light is on. Coolant is being expelled, likely from excessive cooling system pressure. Diagnostics suggest a potential cable or plug connection defect. Has anyone else had similar issues? What diagnostic steps do you recommend?

4 comment(s)

Sounds like a classic data link issue. Have you checked the DTCs and cross-referenced them with Renault's TSBs? A software glitch can manifest strangely with modern control modules. What specific codes are you seeing? Pinpointing the affected control unit is crucial to narrow down the causes.

I have retrieved DTCs pointing to a generic communication error within the engine control unit. However, Renault's TSB database has no specific matches for my vehicle's configuration and error codes. Without explicit guidance from Renault, what diagnostic steps would you take to isolate the defective cable or plug connection?

Generic communication errors are a pain because they can have many origins. Since you've exhausted the TSB route, and given the overheating symptom, I'd start by visually inspecting the wiring harness and connectors related to the ECT sensor and the thermostat housing. A faulty connection there can throw off the ECU. Honestly, without specialized Renault diagnostic equipment, you're probably best off getting it to a workshop. They can run more in-depth diagnostics and pinpoint the exact fault. Overheating can quickly cause catastrophic damage.

I took the vehicle to a qualified workshop based on your recommendation. Their diagnostics confirmed a defective cable connection within the engine control unit harness. The faulty connection was fixed, and the cooling system pressure normalized. The repair cost 95€.

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