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p0540

  1. P0540 and service engine soon light on

    How To's, DIY and Write ups
    Code P0540 shows up on my SuperChip tuner code reader as the Intake Air Heater circuit. I didn't care for 2 years of just clearing the code every month or so, but with OBDII checks with the smog test coming for me sooner or later, I figured it was time to fix it. With a little searching I...
  2. Help Code P0540

    06-07 LBZ & LLY Duramax Powertrain
    I just bought a 2006 GMC K3500 with the LBZ and 114000 miles on it .I have put about a 1000 miles on it and now have a engine light with code P0540 Intake Air (IA) Heater Feedback Circuit.I did a vin check and found out they replaced the glow plug controller right before I bought it ,does the...
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