vincentblade74

C70 Control Unit Communication Error

I'm having a problem with my 2008 Volvo C70 diesel (195549 km). I'm getting a control unit communication error. The engine overheats, the check engine light is on, and coolant spills under the car because of excessive cooling system pressure. Could this be a bad cable or plug?

A 2008 Volvo C70 is experiencing a control unit communication error, leading to engine overheating, a check engine light, and coolant leakage due to excessive pressure. The problem may be caused by a faulty cable or plug, possibly related to a CAN bus communication fault. Suggested solutions include checking the wiring harness and connectors for corrosion or damage and scheduling a workshop diagnostic check to identify and resolve the issue.

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4 comment(s)

I had a similar issue with my 2014 Opel Insignia. Your symptoms sound like a potential CAN bus communication fault. Have you checked the wiring harness and connectors for corrosion or damage? A faulty connection can definitely cause that.

Thanks for the insight. Are there specific areas of the wiring harness and connectors that are more prone to failure? Knowing where to look would help.

My issue was a corroded connector near the engine control unit disrupting the signal. Given your symptoms and the Volvo's age, I'd advise a workshop diagnostic check. It could be a software glitch, but a physical inspection is crucial. That's what I did. I paid 95€ and they found the problem.

I appreciate the advice. I'll schedule a diagnostic check at a workshop to inspect the wiring and connectors. Thanks for your help.

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VOLVO

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C70