thomaswagner8
Velsatis Overheating Communication Error
Summary of the thread
A 2007 Renault VelSatis with a gasoline engine is experiencing overheating and a check engine light, with diagnostics indicating a control unit communication error. The issue is suspected to be caused by a bad cable or plug, leading to excessive pressure in the cooling system and coolant spillage. The problem was resolved by cleaning and securing a corroded connector on the engine control unit and replacing a faulty thermostat.
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4 comment(s)
thomaswagner8 (community.author)
The diagnostic trouble code indicates a generic communication failure within the engine control module. I'm going to inspect the wiring harness and connectors more thoroughly. Is there a specific data link or component known to be problematic on this model?
dirkmayer6
Right, a generic communication failure... sounds like the ECU is throwing a tantrum. Honestly, on these older VelSatises, it could be almost anything in the data link. Given the overheating and coolant issues along with the communication error, I really think you should take it to a workshop. It sounds like more than just a loose wire, and you don't want to risk cooking the engine. Messing with ECUs can be tricky.
thomaswagner8 (community.author)
I took it to a workshop as suggested. It was a corroded connector on the engine control unit. Cleaning and securing the connection, and replacing a faulty thermostat, fixed the overheating and communication error. Total repair cost was 95€.
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RENAULT
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VELSATIS
dirkmayer6
Whoa, overheating VelSatis isn't fun! That check engine light could be screaming about anything. A coolant spill? Yikes, pressure's definitely not where it should be. A dodgy connection sounds plausible. I'd double-check all the wiring and plugs around the control unit, maybe even clean 'em with some contact cleaner. What diagnostic trouble code are you pulling? Could be a software glitch too, but those connections are usually the culprits. Has the car been throwing any other weird codes or acting strangely?