I have codes 107, 483 and 642 comming up. How do I get rid of these codes. 107 I think low voltage correct me if I am wrong. And how do I know if my map sensor is bad.

 

P0107 Manifold Absolute Pressure Sensor Low
P0483 Cooling Fan Speed
P0642 Sensor Reference Voltage 1 Circuit Low

These are form 03 Truck codes. Beyond this i don't know what the problem could be.

 

I am getting these same codes,trucks in limp mode. Did you ever figure out this problem?

 

Anybody have any idea?

 

Code P0642 = 5 volt sensor reference voltage is low. Seems common to the other codes, since the sensors probably won't work too well with a bad reference voltage. Possible causes:

Wiring short or partial short
Bad ECM
Bad or corroded connector
Bad fan sensor (bad fan clutch)

I would try disconnecting the fan sensor. Reset the codes and see if they all clear except the fan. If so, bad fan sensor. Else, probably take to dealer, although you could try looking for loose or corroded connectors in the area of the ECM (with the batteries disconnected).

I have no experience with any of this. I got this by looking the stuff up in the SM for my truck.

 

I have an 03 dodge with these same codes and was wondering if you could tell
me what you found out was the problem. Thank you for any help you might give me.