2004 dodge ram 2500 5.7 hemi. I've been getting this code for about 6 months now. Only started when I I got to Arizona. I have replaced the map sensor the tb and tps the iat sensor the crankshaft position sensor the battery the alternator and the pcm. I'm getting 5v to every sensor except the map sensor where I'm getting 4.88. I shot it all the way to the pcm and I'm getting the pcm putting out 4.89v to the map sensor. I need help I'm at a loss and what else to do

 

OK, I've gone thru the wiring diagram, and I've found one thing different about the path of the 5 volts to the MAP Sensor.
First though, these are the sensors and solenoid that I have found that use the same 5 volt reference supplied from the PCM CONNECTOR C1 PIN 27:
Air Conditioner Pressure Transducer
Accelerator Pedal Position Sensor
Camshaft Position Sensor
MAP Sensor
EGR Solenoid


All these get their 5 volts through splice S154. The connection to the MAP Sensor also is routed through CONNECTOR C107, PIN 5. This connector could be the reason for the different voltage reading at the MAP Sensor.

 

None of the other sensors that you mentioned are on the same 5 volts as the MAP sensor.
Were there other problems that caused you to replace them, or did this problem point you to them?
Why did you replace the PCM and was the MAP sensor voltage the same as now before you replaced it?