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Check Engine light 3.0L Duramax

Dave Cochrane
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Dave Cochrane New Member

Dave Cochrane

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Posted

The check engine light on my 2020 3.0L Duramax came on and stayed on. The fan seems to run instantly even when first initially started. Has anyone seen this?

i called onstar and they didn’t help much. Two codes a P20F8 and a P200A. They told me to get it into dealer. Only issue is dealer not open till Monday. We wanted to tow the boat today but it is suggested to not use for hauling or towing 

Ojustracing Enthusiast

Ojustracing

Posted
Posted

DTC P200A

Intake Manifold Runner Control Valve Performance

DTC P20F8

Intake Manifold Runner Control Valve Control Circuit Performance

 

  • Reduced Engine Power = Active
  • P16 Instrument Cluster = Reduced Engine Power
  • Warning Message = Service Emission System /Service Exhaust Fluid System
caspertek New Member

caspertek

Posted
Posted

Any update on this? My truck threw P20F8 this morning.

Colossus Senior Enthusiast

Colossus

Posted
Posted
8 hours ago, caspertek said:

Any update on this? My truck threw P20F8 this morning.

Did you catch it and throw it back?

Dave Cochrane New Member

Dave Cochrane

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  • Author
Posted (edited)
19 hours ago, caspertek said:

Any update on this? My truck threw P20F8 this morning.

Yes I had truck to dealer last week. They told me the intake control valve needs to be replaced.  They had to order it in and closest place to get was in the USA and said it may take two weeks to get 

Were you able to get yours into dealer? Be interested to see if yours is the same 

Edited by Dave Cochrane
caspertek New Member

caspertek

Posted
Posted
40 minutes ago, Dave Cochrane said:

Yes I had truck to dealer last week. They told me the intake control valve needs to be replaced.  They had to order it in and closest place to get was in the USA and said it may take two weeks to get 

Were you able to get yours into dealer? Be interested to see if yours is the same 

I dropped it off at the dealership this morning but no word yet.

  • 4 weeks later...
Dave Cochrane New Member

Dave Cochrane

Posted
  • Author
Posted

Yes that’s exactly what they ended up replacing on mine. It took a day and a half

have had the truck now for a few weeks and has been good. 

  • 3 weeks later...
Frederic Emard New Member

Frederic Emard

Posted
Posted

I have a 2020 GMC Sierra 1500 with the 3.0 Duramax and also having the check engine light coming ON and OFF.  Appeared first time at about 4500 miles and cleared by itself.  Returned again at 5500 miles and cleared by itself again.  Brought it to a dealer and they found history DTCS P200A Intake manifold runner control valve performance and P20F8 Intake manifold runner control circuit performance.  The codes again reappeared at about 6500 miles and again disapeared by itself.  I used my  BlueDriver code reader today and  it's showing 1 Confirmed Trouble Code : P20F8 (Intake Manifold Runner Control Circuit Performance Bank 1).  Somehting's wrong!!

 

  

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