No bus status on 99 Dodge Status,where do I start to look for problem?

Dodge Ram 1500 error code p1df3
P1DF3 Meaning
The Transmission Control Module (TCM) receives the status of the initialization state from the ESM on the Controller Area Network (CAN) bus while evaluating a counter in the TCM to determine if the initialization time is excessive.
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Hey Jeff, any U- codes stored in any modules ?
U1900 Missing CAN message(s) Door(s) ajar, PRNDL, 4x4, instrument cluster (IC), running boards, vehicle speed REFER to Section 418-00 . U2023 Invalid CAN message(s) Door(s) ajar, PRNDL, 4x4, instrument cluster (IC), running boards, vehicle speed REFER to Section 418-00 .
L4 CHECK THE VDM FOR DOOR AJAR INPUT

• Key in ON position.
• Monitor VDM door position status PID.
• Close all doors, liftgate, liftgate glass and power running boards.
• While observing the diagnostic tool, open and close one door.
• Does the door status PID change between CLOSED and AJAR states?

When you open an close the driver door you have no PID change ,right ?
L4 CHECK THE VDM FOR DOOR AJAR INPUT

• Key in ON position.
• Monitor VDM door position status PID.
• Close all doors, liftgate, liftgate glass and power running boards.
• While observing the diagnostic tool, open and close one door.
• Does the door status PID change between CLOSED and AJAR states?

The door ajar input is an input to the Vehicle Security Module , then transmitted over the bus ! You'll have to find a diagram for the med. speed CAN data bus .

check for codes in the PCM just because the sensors are plugged in doesn`t mean they are working. check for power getting to the coil packs if this is good then check to see if the ground circuit is good and reference voltage is good at the coils. the PCM grounds the coil packs and monitors the reference voltage the power is supplied when the key is turned on. just some places to start

Does it not crank or not start ?
Is it getting spark to the plugs?

Someone will need to figure out if you are dealing with a no spark or no fuel problem to proceed.
The ASD relay is a common problem.

No bus message on the instrument cluster mean's there is a serial data bus problem . All the module's (computers) on your vehicle are connected on the CCD data network . They share information on the network . A shorted bus wire , a module malfunctioning an bring down the network can cause modules not to send and receive data which would cause a no start .
CCD Chrysler Collision Detection Data Bus
008 Chrysler CCD Communications

You might want to find a scanner and see if the computer is working.
Of course check all of the fuses inside and under the hood.

A no BUS signal is a sure give away that your computer has an internal failure and needs to be replaced with a new or re-manufacterd one. This is a common problem with Chrysler still today on there newer models.

It has two,lower ball joints,one on each side.

Clean your negative battery cable end and battery post. The "no bus" usually is caused from a bad ground.