Results 1 to 6 of 6

Thread: P0402 code

  1. #1
    Join Date
    Dec 2005
    Location
    Klamath falls/keno Oregon
    Posts
    466

    Default P0402 code

    Can I get a list of things to look at?? All clamps are tight..MAS look fine, but what would I clean it with besides MAS cleaner?
    Last edited by spongebob; 10-24-2020 at 12:29.
    06 1ton 4X4 duramax/6speed ext.cab WT
    Hummer wheels :^)
    dual lift pump
    Banks air intake

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Default

    Try some electrical (contact) cleaner. Don't use Brakekleen (can damage the plastic and potting). Some aftermarket intake systems can make them more sensitive to otherwise normal conditions, such as a dirty air filter, which can alter the internal turbulence enough to cause faults. Also check for air leaks anywhere downstream from the MAF, as well as the connectors and harness.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Dec 2005
    Location
    Klamath falls/keno Oregon
    Posts
    466

    Default

    Thanks..I have a Banks air intake...is it worH it to remove the EGR and clean it?? They are $250 on ebay for a new one..
    06 1ton 4X4 duramax/6speed ext.cab WT
    Hummer wheels :^)
    dual lift pump
    Banks air intake

  4. #4
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Default

    I didn't look up the code, but yeah. Clean the EGR before dropping a bunch of cash. You can use Brake Kleen on that, once you get all the chunks off.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  5. #5
    Join Date
    Dec 2005
    Location
    Klamath falls/keno Oregon
    Posts
    466

    Default

    I pulled the MAS and found the horizontal ( The large one in the picture) was dirty.. Cleaned it and cleared the code..will come back and update...thanks
    Attached Images Attached Images
    06 1ton 4X4 duramax/6speed ext.cab WT
    Hummer wheels :^)
    dual lift pump
    Banks air intake

  6. #6
    Join Date
    Dec 2005
    Location
    Klamath falls/keno Oregon
    Posts
    466

    Default

    SEEMS TO BE ok, but I started another thread the pro’s and OP’s of pulling the EGR
    06 1ton 4X4 duramax/6speed ext.cab WT
    Hummer wheels :^)
    dual lift pump
    Banks air intake

Similar Threads

  1. j code intake on c code engine
    By Vin82k3500 in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 11
    Last Post: 08-22-2011, 07:47
  2. WTF!?!? Overboost problem again!
    By Shed in forum Duramax 6600
    Replies: 18
    Last Post: 05-26-2007, 22:07
  3. Crank position sensor code
    By spark3542 in forum 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance
    Replies: 5
    Last Post: 09-11-2006, 12:05

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •