kurtblade1
BMAX Control Unit Communication Error
Summary of the thread
A 2012 Ford BMAX is experiencing a control unit communication error, leading to engine overheating, a check engine light, and coolant leakage. The issue may stem from a defect in the cable or plug connection, with a possibility of a software glitch. A diagnostic scan revealed a communication error, but it was not specific to any unit. A similar past issue was resolved by addressing a corroded CAN bus connection near the engine control module. The recommended solution is to have a workshop technician inspect the vehicle, which led to the discovery and repair of a faulty plug and broken wire, resolving the problem.
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4 comment(s)
kurtblade1 (community.author)
Thank you for your reply. Yes, I had a diagnostic scan performed, and it indicated a communication error with one of the control units, but it was not specific which unit. The coolant spill is a rather recent development, occurring simultaneously with the overheating episodes and the check engine light activation. Does that clarify the symptoms further, or do you have any advice what component I should be checking first?
juliandragon3
Alright, a vague communication error combined with a coolant leak... that's not ideal. I had a similar problem about a year ago, it turned out to be a corroded CAN bus connection near the engine control module. In my estimation, while you may be able to trace the wiring visually, without more specific diagnostic equipment, you will be unable to determine root cause of the electrical issue. Given the risk of further engine damage from overheating, and potential cost of different spare parts, perhaps have an experienced workshop technician investigate the car? This is likely the most effective way.
kurtblade1 (community.author)
I appreciate the advice. Based on your experience and suggestions, I will take the vehicle to a reputable workshop for a thorough inspection. Indeed, I found a faulty plug (near the engine control module) and the workshop confirmed also a broken wire. The technician replaced the wire harness and cleaned up the plug, recoding the car's software. Total cost was 95€ . Thank you again for sharing your insights.
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FORD
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BMAX
juliandragon3
Interesting issue. I have a BMAX as well. Those symptoms do suggest a few possibilities. The overheating coupled with the coolant spill makes me think it's more than just a software issue, although a wonky control unit can cause all sorts of havoc. Have you had a diagnostic trouble code (DTC) read from the car's computer? It could point you to the specific control unit that's causing the problem. Was the coolant spill recent?