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Communities > Diagnostics > USA Cars > fault codes p0157 p0401 p0405
fault codes p0157 p0401 p0405

1049 Views 6 Replies Latest reply: 2021-02-03 21:42:51


  •   Level 2   
    (19) points
    fswailes
    2021-02-02 17:23:38
    I have changed the intake gaskets were leaking , checked voltages to egr, tps, o2sensors, replaced egr tube was bad. Even shot the parts cannon at it. Egr valve replaced, 02sensor bank 2 sensor2 replaced and voltages tested. What am I over looking
    Reply

  •   Level 2   
    (19) points
    fswailes
    2021-02-02 17:46:07 (Reply to:fswailes)
    Fyi I'm using ms906bt
    Reply

  •   Level 7   
    (1593) points
    promaster

    2021-02-02 19:32:41 (Reply to:fswailes)

    .
    Reply

  •   Level 2   
    (19) points
    fswailes
    2021-02-02 21:12:45 (Reply to:promaster)
    Sorry its a Chevy silverado 2500 1999 year. Old body style. 6.0 4l80e trans.
    Reply

  •   Level 2   
    (19) points
    fswailes
    2021-02-03 15:47:46
    Well I looked through most of the posts. There don't seam to be anyone willing to help us. That's real disappointing
    Reply

  •   Level 7   
    (1473) points
    Kevin H

    2021-02-03 21:36:51 (Reply to:fswailes)

    These codes showed up after you replaced the manifold gaskets? Looking at P0405,
    the manual says to unplug the EGR valve,connect a test lamp between the EGR valve
    high circuit control and ground. Start the truck and command the EGR valve to 50%.
    The test light should lite up.
    Reply

  •   Level 7   
    (1473) points
    Kevin H

    2021-02-03 21:42:51 (Reply to:Kevin H)

    By the way, the EGR high control wire that you want to check with the test light is the
    red wire pin E on the EGR connector. I would ignore the O2 code for now.
    Reply
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