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P154C Diagnostic Trouble Code Discussion for March 2014

Intake Air (IA) Heater Current Signal Circuit Malfunction

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Trouble Ticket Help Requests for DTC P154C
Help Request Posted
2009 GMC Sierra 3500 HD WT 6.6L MIL Lamp on VIN: 1GTHK79659
P154C: intake air heater. Ok this is an intermittent problem,seems to happen only when started cold and not every time that it is started cold.With an amp clamp on the main power to the heater it looks like it starts at about 150a,then starts to taper down after a min.or two.(that is a...
March 21, 2014