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Discussion Starter · #1 ·
Hello, I have a 2011 Gen1. I have a code P219A that shows as "Historical" using torque Pro. I changed the O2 sensor about 7 days ago, drove the car to work and all around town. I've tried mountain mode, not charging and going into low propulsion unit I get the 20% battery to back to hybrid. I've tried resetting the light driving 25MPH for more than 8 minutes then idling for 30 seconds and then shutting car off. The CEL turns off for a while then just turns back on sometime later. Anyone ever won this battle?
 

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2011 Premium, Nav (added back-up camera! :)
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that is a code for air/fuel imbalance amongst the cylinders, not really an indicator of a bad O2 sensor. Might be more likely caused by a fuel or air delivery imbalance. Maybe a faulty injector? Just a guess.
 

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Discussion Starter · #3 ·
Well I had a friend who is a diesel mechanic use his computer and it didn't find any fault codes. He retimed the injectors (whatever that means). He also ran an air fuel balance test or calibration (something like that). Those were the two tuning items his computer could do. I was thinking vacuum leak maybe? the idle is smooth and the high RPMs seem a little rough but I'm not sure. Is there a good way to test injectors at home?
 

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Are you not charging the battery with an EVSE ? Using the Volt as a hybrid? That could be dangerous with a 10 years old HV battery. Common advice is to always leave the Volt plugged in.
 

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Discussion Starter · #5 ·
It's normally plugged in after every trip. Just trying to keep the ICE running for some time to help clear the codes by getting ICE run time. The problem is the P219A code that hasn't cleared after a week of "normal" type driving. Don't want to have to go to the dealer for a code clear. Was hoping someone else has had this problem to resolve.
 

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2012 Std w Nav
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P219A is a Type A code, which means it latches on until cleared by the the proper GDS2 shenanigans. No amount of normal driving cycles will turn it off. Which means dealer visit or buy a VCX Nano, install the accompanying software on a supporting laptop, subscribe to the appropriate service using your VIN and get comfy with wielding all of that to good effect.
 

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Discussion Starter · #7 ·
Is a type A code something a non-dealer shop can clear or is it a dealer only thing? This is the first I have heard of a type "A" code??
 

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2012 Std w Nav
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As I mentioned in my post about how you could clear it, a non-dealer shop can ALSO buy all the stuff needed to do module reprogramming, which includes the function for resetting the latching (Type A) codes. I can't promise either way that any given shop will or won't have the capacity already, or whether they'd be willing to.
 

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2014 ELR with ACC, 177k miles
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I had P219A a year or two ago. Replaced the valve cover that has the integrated PCV. Reduced vacuum leaks and cleared problem.

I am pretty sure I cleared the code with my little Bluetooth plug in OBD tool.
 

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Discussion Starter · #10 ·
I had seen something about the valve cover leaking PCV. I will look into that this weekend. I have an appointment at the Chevy dealer next week to start at $165 just to look into it. I was hoping to find a solution before then. I will check into the engine and let you all know what I find.
 

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Discussion Starter · #12 ·
Well so far I have replaced the upstream O2 sensor, sparkplugs and the valve cover. Still have a P219A code and now a P0606 code has appeared. Removed the negative battery cable and grounded the positive for an hour and then tried to clear the codes to no avail. Seems to drive ok have a dealer appointment in a week maybe the codes will clear by then or I can clear my credit limit😭.
 

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Discussion Starter · #16 ·
Here was the "official" diagnosis:
No faults were detected on vehicle. Possible that the fuel injector is becoming restricted or failing,
but AFIT test (for fuel injectors) passed showing no issues. We recommend doing a fuel system service
to remove possible build up in fuel injector and to maitenence fuel system.

After inspecting your vehicle, O Rielly Chevrolet Inc recommends additional services be completed.

They wanted $220 for this service. Said it was optional and that there was no diagnostic codes on the car. Literally
drove 3.5 miles from the dealer home and the check engine light came on again. Code P219A still there. They charged $165
for the diagnostic. At least its good for 90 days I don't have to pay the diagnostic again. So needless to say I drove it directly
back to the dealer and told them to fix it. Lets see what they come up with next.
 

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2013 Volt - Silver Topaz
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What are the chances of a buyback??
Sarcasm is hard to interpret on the internet, I assume you must be joking? No manufacturer buys back an eleven year old car because it’s broken, even if they can’t figure what is wrong with it.
 
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