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Help! Engine Power Reduced mode, '09 GMC Duramax

Firewalker918

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Firewalker918 New Member

Firewalker918

Posted
Posted

ust had my 2009 GMCicon1.png Sierra 2500HD Duramax serviced with new fuel filter and Air Filter yesterday.

Today each time i start up vehicleicon1.png it prompts "Engine Power is Reduced" It feel like it has a governer on it and will just crawl up to about 40 mph. The after a little bit, the code goes away and it seems to run fine. UNTIL I stop and turn off vehicle and restart.
This is very UNSAFE especially pulling trailer and trying to pull out into traffic. IT isnt the transmission, You can floor it and RPM will not go up high, it is just a slow poke feeling but once you get it up to 30-40 mph for a couple miles it will come out of this weird thing and run fine, UNTIL you sit at redlight or cut off engine.
A couple times it has prompted "Clean Exhaust Filtericon1.png" then "Check Owners Manual NOW"
I did and cant find anything.

I have saw some threads about wet or snow in air filtericon1.png, it is warm and sunny here, no moisture except for the humidity.

Could it be the change of air filter? or just coincidence?

Any help will be much appreciated!

r1byker Enthusiast

r1byker

Posted
Posted

It's telling you to clean the diesel exhaust filter, not your air filter. Your manual should have a section in there describing exactly what your truck is doing when the exhaust filter is clogged.

Firewalker918 New Member

Firewalker918

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  • Author
Posted

I understnad it is saying Exhaust, I was metioning the fact of cahinging air filter in case it could be connected.

 

I have dorve the truck on interstate for about 60 miles at 75 mph with burst up to 85-90. If that wont burn the soot out I dont know how else. This should satisfy the direction in Manual.

I am afraid something else is wrong......

 

I am carrying tomorrow to get codes read.

Firewalker918 New Member

Firewalker918

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  • Author
Posted

Just got back from GMC service.

 

a leaf had gotten between air filter and intake during change of airfilter apprantly. Thus why it would go to power reduce mode on idle and once i got it out on road and up to speed enough air flow went by to let engine roll.

 

Thus, the Power Reduced Mode and Check Exhaust filter is directly correlated to air intake.

 

thanks to all who helped!

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