I'm Manny and i own a 2000 Dodge Dakota slt
3.9... V6
error codes just pop up. P0601 & 1492
I think my ECM is going out... Does anyone know where I can get one at a good price.... Thx

 

Welcome to the forum. What makes you think your ECM is going out?

 

Error codes ...p0601 and 1492
each time im coming to a complete stop at a light. A check gage lights up.....
any clue anyone

 

P1492 is a battery temp sensor fault, either too high or open circuit.
https://www.engine-codes.com/p1492_chrysler.html
P0601 is a serial communication failure of the ECM
https://www.obd-codes.com/p0601

I would first suggest using a multimeter to check your alternator output. Put it in DC Voltage mode, start the truck, and see what the voltage is at idle by placing the probes on the battery terminals. It should be within the 13-14.5V range when idling. Either increase the RPM via the throttle connection, or have a friend raise the RPM from inside to see if the voltage goes up. Remaining steady at 14-1.4.5 is ideal, ~15V can still be safe. Anything above that means the voltage regulator in the alternator has gone out, replace alternator. I just went through this on a 2000 Nissan Sentra, at idle it was pumping 17.8V. Usually the alternator light or service engine light would come on when I stop or at high RPM.

I mention this as overvoltage from the alternator can overcharge the battery, and at the same time, drastically increase heat (tripping the battery temp code), and ruin the battery. Overvoltage can ALSO cause feedback in the ECM, which as of right now, could just having connection issues, but could lead to fully burning out the ECM.

So current steps I would say test the alternator and clean the ECM connectors with electrical connection cleaner.

 

What he said /\

Dakota's HATE low voltage.

 

and high voltage. and medium-low and medium-high voltage.

Actually, I think they hate every voltage except the exact amount of voltage that they want.

Now if only we knew what that was...

LOL

(OP - yes, the PCM's are incredibly picky)