2010 Denali - 6.2 CEL P3400

[jeffro22]

just bought the truck and on the way home the CEL comes on. truck runs fine, took to autozone and it is showing 2 codes.

p3400- cylinder bank 1 deactivation

also, showing code for map sensor


truck has 80k on it

 

[JML07denali]

Try cleaning your MAF. (Mass air flow sensor) with MAF cleaner..


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[jeffro22]

Truck wouldn't start over the weekend. Was saying some kind of security message. basically had power to everything but nothing would happen at all when I turned the key. I had to disconnect negative battery cable for a little while and the truck started up fine, But now is displaying service traction control and service stabilitrak.. Drove a couple hundred miles and no check engine light but the other service lights stayed on the whole time.


getting a bad feeling something with the computer is messed up. any thought??

 

[JML07denali]

Yes, many times you might have an issue and the CEL won't come on, but if you plug in a OBDII scanner you will get your error codes. I would take it to a mechanic and have them out it on their machine to try to pinpoint the issue. It's sounds like it has something to do with your V4 mode and cylinder deactivation.


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[jeffro22]

ok thanks for the help!

 

[jeffro22]

wondering if this could be all caused by a grounding issue/problem?