I have a 2001 dakota it tells me no buss i just got it some one started to replaced the motor I got it back toghter and know it says no buss

 

That means the instrument cluster is not able to communicate with the PCM. Does it run?

 

Why did someone started to replaced the motor what motor did you replaced it with

 

To reset the pcm some say to remove ground wire and turn on ingnition like you are starting car.....personally I don't think it works, I think doing like I do on my jeep works...key off, remove ground cable from battery, now with no wires on ground terminal of battery, take the ground cable and touch it to the positive side of battery, there will not be any spark because you have nothing on battery ground terminal, all it does is drain any capacitor in the pcm, this makes it go back to factory default setting. That said you don't need to reset PCM to get rid of nobus, it will go away on it's own when problem is found and fixed.
There are four sensors that send a signal through inst.cluster and pcm, and if they don't you get the "NOBUS" 1) governor pressure sensor, 2) crank pos. sensor, 3) cam pos. sensor, and 4) manifold air pressure sensor. You could have a short to ground in one of the power wires to those, they use a 5 volt power supply. You could try wiggling the plug to PCM and see if no bus goes away, if not here is a test procedure .....it's a little long a read but really not hard to follow.

Vehicle: 1998 - 1999 Dodge Durango 3.9L 2000 - 2001 Dodge Durango 4.7L 1998 - 2000 Dodge Durango 5.2L 1998 - 2001 Dodge Durango 5.9L

Symptom: Engine will not start. Gauges are inoperative. No BUS message displayed on odometer. System: Body/Chassis Electrical, Emissions/PCM/Fuel, Engine Electrical Codes: N/A Problem 1 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Crankshaft Position (CKP) Sensor.

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor. If 5v is not present, unplug the Crankshaft Position (CKP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CKP sensor.

Problem 2 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Camshaft Position (CMP) Sensor.

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the Camshaft Position (CMP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CMP sensor.

Problem 3 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Manifold Absolute Pressure (MAP) Sensor.

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5v power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the MAP sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the MAP sensor.


Problem 4 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Throttle Position Sensor (TPS).

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5 volt power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the TPS. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the TPS.

Problem 5 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted wire.

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the throttle position sensor (TPS) or manifold absolute pressure (MAP) sensor. If 5v is not present, unplug all sensors that are connected to the 5v power supply and disconnect the PCM. Check if either 5v power supply circuit is shorted to ground using a DVOM. If the circuit is found to be shorted to ground, repair the wire and the cause of the short.

Problem 6 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Governor Pressure Sensor.

Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the large round connector on the driver's side of the transmission. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, remove the transmission pan and check for shorted wiring inside the transmission. If the wiring is OK, replace the Governor Pressure Sensor.

Mine did the NOBUS and it ended up being the PCM itself, sometimes the circuit board cracks, or most often a cold solder joint.....

 

touching the terminal ends and turning the key to start do the same thing, turning the key to start drains any capacitors in the system through the starter solenoid. Same end result, just has a resistance value of the starter motor in the drain circuit (or the solenoid leg depending on how much juice is left in the capacitors)


i would never recommend touching the two ends together simply because most people in the this world are likely to screw it up somehow and the potential to damage something electronic with an arc, or to zap oneself is too high.

 

Disconnecting the battery, and turning the headlights on accomplishes the same thing as well.