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Bulletin PIP5201 Cold Start Misfires MIL P0300 P030x

5288 Views 16 Replies 5 Participants Last post by  DMC5180
So for the past few days, I've had the check engine light start flashing when the battery finally dies and it kicks into engine mode. It's also stayed on twice after it's flashed. Checked the code with my OBDII scanner and the first 2 times it was P0303. Last night on a a test drive, I could only get it to flash, not stay on, and the code that showed up was P0300pd. I tried to swap coils, but realized it was a weird "all in one" coil pack that I've never seen before and I couldn't just swap colls to see if # 3 coll was bad. My engine only has about 30k miles on it, the rest of the 67k is all battery miles. So I can't imagine the plugs would need changed already, since they're supposed to be good for 100k.

One interesting thing to note... I have had this wheel vibration that's gotten worse over the past month or so, and it's gotten pretty bad just recently, almost maybe coninciding with the CEL. I read in the manaul that a flashing CEL could be caused if I used different tires than OEM, which is weird. I'm wondering if the vibration is somehow triggering the code/CEL??? Anyone ever experience anything like this? Any suggestions? In the mean time, I guess I'll fix the wheel vibrations and see if that fixes it. If not, I'm thinking replace the "coil pack bar" or whatever it's called and see if that does the trick. Any thoughts or ideas are welcomed.
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Ok, so the manual actually says, "...the replacement of the original tires with other than those of the same Tire Performance Criteria (TPC) can affect the vehicle emission controls and can cause this light to come on."
No, no other changes noticed really, besides the vibrations (which are coming from the rear right) and the CEL.
So the vibration was beacause apparently the rear right tire had separated inside. Got new tires on it now and the vibration is gone, but the CEL still comes on intermittently, blinking, with engine vibrating when in comes on, etc., still with same codes. My wife said she heard some sort of brief knocking during the engine vibration the last time she drove it. Haven't driven it since. Guess I'll start with spark plugs, then new "coil pack" since you can't swap them around. Will report back.
Took it to the dealer since I was still under the 5yr/100k mile powertain warranty. Dealer said there's a memo out that this code with these symptoms on 2012 Volts means the cylinder head needs replaced, so they're doing so. Part should be in tomorrow. I wonder if they fixed whatever caused this to happen in the first place. If not, might be selling this. No way I want to have to pay for this again out of pocket! Probably not a cheap or easy fix.
The service bulletin is PIP5201A. Got it back. $2,300 repair - done just under warranty! Dodged that bullet!!!
I'd like to know what makes this a 2012 Volt specific issue? Did the they change the head design for 2013 model years. I found the service letter but could not access the full document without paying a $5 one time fee for that info. The title was " Cold start misfires MIL P0300". (Jan-25-2017)
I'll buy it and post it so we can all see what it has to say.
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