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Saw this on another C-Max Board: "I copied this from the other forum. You might want to print this and give it to your service writer. from salman "More information: Upon hearing that my battery was dead after all the battery related TSBs were performed, Ford engineers told the mechanic working on my car to check the following electrical connectors for water intrusion: C134, C144, C140, C1812, and C1651. One of those is for fog lights. C1812 is for the coolant water pump. I am not sure yet what the others are for. These connectors are all on the main engine wiring harness. Water was found in connectors C144 and C1651. Ford does not have replacement connectors available, so the engineers are recommending replacement of the entire wiring harness. A week to get the part, 1 or 2 days to install. According to the engineers, they do not know whether the connectors have a design defect or were damaged during initial assembly. A key point to remember is that the engineers directed the mechanic to check these connectors because water has been found in them on other cars. The engineers said, "We have seen water intrusion at these connectors that can cause intermittent battery drain concerns." The TSBs about the display screen and DC converter (i.e, charger) clearly do not fully resolve the 12 volt battery problems." Also Read on yet another Board that the Liftgate latch could have a Problem where it does not close Properly. leaving the lights on and in turn Draining the Battery! Something worth Checking into or at least make sure the Lights are out before leaving the car overnight? Hope these Help?Report it
My C-Max did the same thing, tried to start the car only to find that the battery was dead. about a week later my wife was standing in the garage when the head lights came on by themselves( nobody was near the car). I tried opening and closing doors, when I opened and closed the lift gate the lights went out. The dealer couldn't find the problem. when driving the car with the air conditioning on, the car makes a loud whining noise until I gain speed,then it goes away. It's a strange car and I don't know what to expect, I don't think the dealers service department does either. I'm afraid this car is going to be a problem.Report it
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