
2002 GMC Sierra 2500 HD SL 8.1L MIL Lamp on
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?
FIX posted 3/17/2015
![]()
iATN Members:
Login to view full TechHelp request Auto Repair Pros: Join iATN to read this TechHelp request Vehicle Owners: Find a nearby iATN member to repair your vehicle (View Replies)5 Replies Received(Hide Replies)5 Replies Received
|
Message Closed w/FIX
|
VIN | 1GTHK23GX2 |
Engine | 8.1 L / 8 cyl / GAS |
Trans | 5-speed Automatic (Electronic) |
Delivery | Fuel Injection |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Intermittently |
Trouble Codes
P0401 | EGR System Insufficient Flow Detected |
Message Closed w/FIX
Vehicle Data
2002 GMC Sierra 2500 HD SL
VIN | 1GTHK23GX2 |
Engine | 8.1 L / 8 cyl / GAS |
Trans | 5-speed Automatic (Electronic) |
Delivery | Fuel Injection |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Intermittently |
Trouble Codes
P0401 | EGR System Insufficient Flow Detected |