Question about 2004 Dodge Ram 2500
I checked the air intake heater elements and it is good. I don't know how to check anything else. Can you help?
May be a check valve letting warm expanded fuel to slowly leak back to the tank causing hard start. When starting cold its harder to move the cold thick fluid. Check into it. Good luck..
Posted on Aug 29, 2009
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Posted on Jan 02, 2017
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Jan 19, 2013 | 1989 GMC Sierra
Apr 18, 2011 | 2004 Dodge Ram 2500
DTC P0540: Intake Air Heater - Incorrect Voltage
The Engine Control Module (ECM) uses an Intake Air Heater (IAH) to warm the incoming air for proper cylinder combustion. The ECM grounds the control coil of the IAH relay to energize the heater during cold weather operation. If the ECM detects voltage on the IAH circuit when the relay is commanded OFF, or incorrect voltage when the relay is commanded ON, this DTC will set.
There are several possible causes for this code including:
Faulty IAH Relay
Faulty IAH Relay Control Circuit
Faulty Line Voltage Reference Circuit
Faulty Heating Element
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