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markd85

Awful noise coming from the engine

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The entire transmission including the two motor/generators is covered by the hybrid 8/100,000 yr/m warranty. The 2013's have had a rash of transmission failures due to perhaps a faulty bearing. This should be covered by the warranty.

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The amount the HVB losses over time is very small and does not cause lowering of mpg in any case. Early Prii were tested by the US government and had lost 60% of their energy capacity. The mpg were unaffected. You have a failing transmission. Escalate this with Ford as per the Owners Guide.

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The US Government tests on a 2010 FFH showed it lost 8% after 160k miles. You can't see that on any displays. You have a C-max on which you can probably see the EV mileage reduction.

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It can't leak internally and the fluid is used only to lubricate gears. It never needs changing and there is no torque converter. Flushing is not needed. The 2013 transmissions had manufacturing defects rumored to be a bad bearing design or vendor. They all should have been recalled. Ford decided to wait them out on the warranty. No more Fords for me. The 2010-12 FFH transmissions were made by Aisin, the "Borg-Warner" of Japan minority owned by Toyota. They were bullet proof. Ford brought the manufacture of the 2013+ transmissions in house and loused it up. Any 2013 that hasn't had the transmission replaced is a ticking bomb.

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Don't confuse the transmission coolant with the transmission lubricant. There's the motor/electronics coolant ( MEC ) system and there's the transmission lubricant cooling system. In the plug-ins, there's an electric pump for the lubricant cooling system in addition to the ICE driven one. The hybrids don't have that and when they upped the max EV speed of the hybrids from 60 to 86 with software updates, it was surmised that there was lubricant overheat that contributed to the rash of failures. Nobody but Ford knows for sure. If there was a bearing manufacturing problem from a vendor, the vehicles affected should be known and may be in the thousands. We are continuing to see on this forum too many failures of these first Ford built transmissions as they age. Since they don't fail catastrophically and cause a safety issue no recall has been issued and Ford is just waiting out the 8/100,000 hybrid warranty. Sad ! !

I was a big advocate for these Ford hybrids since I got mine in July 09 but Ford's response to these 2013 transmission failures is ( put in your own word ).

Edited by lolder

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Did the C Max have early transmission failures also? If so, that points to a bearing problem instead of a cooling problem.

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