My service engine light is on, with code for pcm, my abs and defrost light blinking on my 2002 Dodge ram 1500 4.7

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I am having the same problem. I replaced the speed sensor on the rear diff. and the problem went away but when i started it the next day the problem came back. If you figure it out let me know.

SOURCE: 1999 dodge ram 1500 2wd 5.2L gives different intermittent codes

pcm posably but i think i would look at the grounds from the battery to body and bat to engine

SOURCE: check engine light code P031 for 2002 Dodge Ram

Dear Madam or Sir,

the code stands for:

Heated Oxigen Sensor1, Bank 1, Heater Control - circuit low.

So the heating of the O2 Sensor is faulty, you should see a mechanic to fix it.

SOURCE: 2002 dodge ram 4x4 1500

It could be low fuel pressure. Have it tested with a gauge.

SOURCE: 2002 dodge ram 1500 4.7 ,0700 code comes on along

If it is code P0700, then it is a transaxle malfunction code. This is related to your transmission, and can display signs of your transmission slipping, etc.
Is this an automatic?
You can use a scan tool to read the code, and it may give you a more exact fault. O'Reillys will lend you the proper equipment to check, and it is very easy to do.
The TCM (Transmission Control Module) makes your check engine light come on along with it to let you know that there is an issue.
You may have a problem with the module itself, possibly a short in the circuit.
Is the truck shifting at abnormal points, shifting takes longer or transmission slips?