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Discussion Starter · #1 ·
Is there a noncritical reason a check engine light could come on? I bought the car yesterday and later in the evening my check engine light came on and stood on. This morning it was off and never came back on. I still took it to dealer for check up and they found nothing wrong? Should I be concerned? should I get a second opinion? should I wait a week or two or three? Help...
 

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If it's a loose or leaking gas cap or similar issue with evaporative emission system EVAP, the fault code will reset itself at some interval. If it comes on and stays on then you may have a real problem. There are so many sensors that could set off the check engine light. If you have something more serious like O2 sensor, coolant temp sensor, EGR sensor, the code will likely stay lit and can be read with any OBD2 reader.
 

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there are also flags that can be tests that have not run due to system resets
you see these on Volts that run 100% electric

only a problem in states that make you have a full yearly inspection.
 
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I would be annoyed with the dealer--these codes will remain in history for diagnostic purposes. Did they tell you what the code was or related to? It may be that the code was set but there was no problem found with the associated system. But I'd still want to know what it was flagging (e.g. gas cap as mentioned above).
 

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Discussion Starter · #5 ·
Thanks All for replying. So dealer said they ran tests including emisions and found nothing wrong, but I should bring it back next time when light is on. I appreciate the info on the history, I was not aware I could ask for a history of codes. I will look into and update all. thanks again everyone!
 

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I wish the Volt stored codes in a history buffer but I have discovered that it doesn't.
 
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I wish the Volt stored codes in a history buffer but I have discovered that it doesn't.
I beg to differ. I went into the dealership a 4 months ago because the cooling fans would ALWAYS come on every time I shut the car down. No matter the temp. There was no light. When I pulled into the dealership they pulled two old codes and one current code all related to the EGR> Replaced the EGR under warranty and everything went back to normal.
 

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Discussion Starter · #9 ·
Ok Friends, it happened again. this morning I got in my car powered on, CEL came on and when I put it in gear dash read "put back in gear (park)" and check??? It wouldn't acknowledge drive or move? This happened 3 times, finally I turned off completely opened drivers door, closed drivers door, started car and all worked fine with the exception that the CEL was still on??? I drove this morning and around 12pm I started again and CEL was off???? Any information would be greatly appreciated as I am schedule to take to "Toyota" dealer where I purchased. Should I take to Chevy dealer?
 

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Ok Friends, it happened again. this morning I got in my car powered on, CEL came on and when I put it in gear dash read "put back in gear (park)" and check??? It wouldn't acknowledge drive or move? This happened 3 times, finally I turned off completely opened drivers door, closed drivers door, started car and all worked fine with the exception that the CEL was still on??? I drove this morning and around 12pm I started again and CEL was off???? Any information would be greatly appreciated as I am schedule to take to "Toyota" dealer where I purchased. Should I take to Chevy dealer?
Could be a 12V battery throwing errors, esp. indicated due to it working after it was not letting you drive it. Also in general, if high voltage battery has intermittently bad cells, you can see the MIL activate and you will also get errors relating to shifting the vehicle back to park (even though it will let you turn the car on). Though the last time this happened to me, it wouldn't let me restart the car. It seems there are some high voltage battery faults that will make the car brick and others that will let you drive it.
 
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