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SES glow plug ciruit?

Discussion in 'Chevy Trucks' started by ticki2, Dec 10, 2009.

  1. ticki2

    ticki2 Senior Member
    from NH
    Messages: 175

    Truck is an 03 chevy duramax with California emissions. The SES light is on , had the code read and it says po380 glow plug cicuit . The circuit consists of two elements, the glow plugs and the controller. The controller has relays for the glow plugs and the intake air heater. At least this is what I understand. The question is , are there any tests to determine which part is failing without a code reader ? Thanks
    Last edited: Dec 10, 2009
  2. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    I would have to say NO... Find someone with a tech II scanner.
  3. Newdude

    Newdude Senior Member
    Messages: 877

    Could be either a glow plug or a relay. A GM Tech-2 could narrow down the problem very quickly.

    The Tech-2 scanner can display the amperage and resistance for each glow plug. If the resistances for them are extreme numbers (65 ohms, when spec, if I recall should be between .1 and 1 ohm) then the glow plug is bad. Also, an amperage reading of 0 (normal is usually btw. 19-22 amps), then the plug could be bad.

    When you go to start the truck, does it start fine? If its a relay, I would think that the truck would start pretty roughly.
    Last edited: Dec 10, 2009