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2002 GMC Sierra 2500 HD SL 8.1L MIL Lamp on
Posted to GM Driveability on 3/4/2015 5 Replies

Check engine light comes on and off on highway driving. Code po401. Does anyone know if the egr ports gets clogged on 8.1l engines and if it does where? do you have to remove intake manifold to clean out ports?

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  Related Documents & Media  2002 GMC Sierra 2500 HD SL

 
Message Closed w/FIX

car Vehicle Data

2002 GMC Sierra 2500 HD SL

VIN 1GTHK23GX2
Engine8.1 L / 8 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0401EGR System Insufficient Flow Detected
Message Closed w/FIX

car Vehicle Data

2002 GMC Sierra 2500 HD SL

VIN 1GTHK23GX2
Engine8.1 L / 8 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0401EGR System Insufficient Flow Detected