Cummins wont start when cold

check antifreeze level add if low, and check intake heat control valve on ps side of intake if its locked shut it can be removed and a water pipe nipple put in place of it and the heater hose reconnected..if the water pump is good, it should give heat this valve should be on the intake with a heater hose connected to it..and its vacuum operated but will jam shut with age and cold weather..good luck..

DID YOU CHECK THE GRIDE HEATER OR SELENIODE
CUMMINS USE GRIDE HEATER (INTAKE HEATER) TO REPLACE GLOW PLUGS
SELENOIDE IS SPECIAL FOR THAT JOB MAY LOOK LIKE REGULAR BUT ITS NOT
CHECK WITH KEY ON EARLY IN AM TO SEE IF HEATER IS GETTING POWER
USED AT 12 VOLT TEST LIGHT AT HEATER INPUT MAKE SURE GROUND IS GOOD
IF NO POWER CHECK SELENOIDE TO SEE IF POWER IS THERE IF NO POWER
CHECK LIVE SIDE OF SELENIDE THEN CHECK SIGNAL SIDE (KEY ACTIVATED SMALL WIRE) IF NO SIGNAL POWER CHECK FUSE IF NO MAIN POWER BACK TRACK TO BATTERY

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

Faulty ECM

DTC P0113 is Intake Air / Charge Temperature Sensor High,
Check wiring to the sensor and if that is good then the sensor may be dirty or bad.

the link below shows what it looks like and has a price for the sensor.

http://www.genosgarage.com/prodinfo.asp?number=4984570

need to replace fuel lift pump

Well, Hate to say this to you but your Cummins 24v turbo diesel does not have glow plugs. The fuel temperature necessary for proper ignition is heated by an element inside your fuel filter housing.

When swapping intakes you may left something unplugged or unhooked recheck the swap and connect any item left.

when you start the truck do your lights dim and your volt gauge fluctuate. if they do, i would think the grid heaters are working. could be an injector going out

misty check the water level in the radiato...if it is low the last thing to get any water is the heater core..if low you will need to find the reason...like a water pump or headgasket leaking