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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 08-16-2017, 03:42 PM   #1 (permalink)
throwraft
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2008 Duramax turbo trouble

I changed the gearbox and had to remove the lower intercooler pipe coming from the turbo. I put it all back together and the turbo is super loud like a ford. I don't know if I missed something? Steering and brakes work awesome.... When I drive, the turbo is real loud and all of a sudden, truck goes into low power mode. Code P101 and P401 pop up. It's clearly an air issue, but can not seem to back trace my steps from last night! Any suggestions?

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Old 08-16-2017, 04:33 PM   #2 (permalink)
Rvn4me
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Michigan Oil Burners Member

P0101
https://www.dieselplace.com/forum/63-...f-trouble.html

P0401
This codes usually occur when the exhaust is altered.
Most likely you didn't get everything buttoned up correctly that's where your getting air noise.

Are you talking about your down pipe?
Is it #(016) That's not aligned up.
http://www.wholesalegmpartsonline.co...rimLevel=25399


Last edited by Rvn4me; 08-16-2017 at 04:49 PM.
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Old 08-17-2017, 03:46 PM   #3 (permalink)
Ron Nielson
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DTC P0401 or P0402

Diagnostic Instructions


DTC Descriptors

DTC P0401

  • Exhaust Gas Recirculation (EGR) Flow Insufficient
DTC P0402

  • Exhaust Gas Recirculation (EGR) Flow Excessive
Circuit/System Description

The engine control module (ECM) tests the exhaust gas recirculation (EGR) flow when the EGR is in operation. EGR desired flow is compared to EGR actual flow. If EGR flow is lower or higher than expected DTC P0401 or P0402 will set.

Conditions for Running the DTC


  • DTCs P0101, P0102, P0103, P0403, P0405, P0406, P046C are not set.
  • The engine is running.
  • The EGR valve is actively being controlled.
  • DTCs P0401 and P0402 run continuously when the above conditions are met.
Conditions for Setting the DTC

P0401

The ECM calculated air flow deviation based on the MAF sensor input during EGR operation indicates insufficient EGR flow for 15 seconds.

P0402

The ECM calculated air flow deviation based on the MAF sensor input during EGR operation indicates excessive EGR flow for 15 seconds.

Action Taken When the DTC Sets


  • DTC P0401 is a Type B DTC.
  • DTC P0402 is a Type A DTC.
Conditions for Clearing the DTC


  • DTC P0401 is a Type B DTC.
  • DTC P0402 is a Type A DTC.
Diagnostic Aids

Inspect for the following conditions that may cause this DTC to set:


  • Contamination on the MAF sensor element
  • Restriction before or after the MAF
  • Skewed MAF sensor
Circuit/System Verification


  1. If DTC P003A, P0101, P0403, P0405, P0406, P046C, P0698, or P0699 are set, diagnose these DTCs.
  2. Using the output controls on the scan tool command the EGR solenoid to 10 percent.
    • If the actual EGR position remains stationary, replace the EGR valve.
  1. Inspect the exhaust system for leaks, restrictions, or for modification of the original equipment manufacture (OEM) part.
  2. Visually inspect for leaks between the MAF sensor and the turbocharger.
  3. Visually inspect for a restriction in the air cleaner or the air intake ducts.
  4. Visually inspect for a restriction in the turbocharger charge air cooler.
  5. Visually inspect for a restriction in the intake manifold.
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing

Important: Perform the Circuit System Verification before proceeding with Circuit/System Testing.

Inspect the charge air cooler for leaks.

If no problem is found, perform the component testing.

Component Testing

Important: Perform the Circuit/System Verification before proceeding with the Component Testing.


  1. Using the output controls on the scan tool command the EGR solenoid to 10 percent.
    • If the actual EGR position remains stationary, replace the EGR valve.
  1. Spray the EGR valve gaskets and EGR cooler gaskets with a soap solution. Start the engine. Command the turbocharger vane position control solenoid ON to 100 percent and inspect for leaks around the EGR valve gaskets.
    • If a leak is found replace the EGR valve gasket.
  1. Remove the EGR valve.
    • If the EGR valve is sticking, or is damaged, replace the EGR valve.
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Old 08-17-2017, 05:19 PM   #4 (permalink)
Paul Clancy
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Inspect carefully all the blue silicon boots on the hot side intercooler pipe. One is likely ripped
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