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I have a 2006 Honda civic hybrid that keeps giving me codes U0037, U1205, U0037, U1205, and U0037 only when its cold outside. The IMA light comes on, the red battery light comes on and the green drive light starts blinking. The IMA battery will not charge or give any type a status. The IMA system is disabled completely. I checked all the IMA fusses and they are all fine and also checked the plug underneath the rear seat, that was good as well. I did have to replace the 12v battery but the problem remains. When it is 70degrees or warmer it runs fine no codes the IMA system runs perfect. Can someone please point me in the right direction.....

 
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how old the batteries are? Might be getting close to 10 years? (normal life)

 
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The batteries have been replaced two years ago. Like I said when its warm out the system works perfect. The batteries charge and the electric motor works.

 
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Were they new units? Old batteries tend to work acceptably in the warm, but the cold is what kills them. That would explain why it's fine when it's warm out.

 
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Agreed I was thinking some sort of low voltage situation

 
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I was told that they were replaced prior to my son in law buying the car. That's all I know. I did not get a code that the batteries were deteriorating or going bag though. Only the four codes that I posted.

 
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Okay. I'm a pessimist but I'd question the legitimacy of that claim unless there's proof suggesting otherwise. The batteries are expensive to replace so it's fairly common for people to claim they've been replaced to retain value.

 
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from my understanding if the batteries were bad it would give me another code. Right? That’s what I have researched so far.

 
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Maybe, maybe not, electronics can be funny

 
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or they messed something when they did change the batteries.