Truck won't start {4.7} fuel gage shows empty - but full.

20

Asked by Sep 04, 2010 at 08:11 AM about the 2000 Dodge Dakota Club Cab

Question type: Maintenance & Repair

My odometer reading  changes to - No bu5 & the check engine lite & low fuel lites
come on. Any idea what the No bu5 code means ? I'm getting ready to drop the
tank & change out the sensor/ pump unit.

11 Answers

12,085

its your crank sensor, its burned out and causing a 5 volt reference down at the pcm, and since your pcm and your BUS communication center interact with each other this is the reason nothing is working because with the crank sensor shot the engine isnt able to find top dead center and bottom dead center therefore its just inhibiting the engine from starting. i hope this helps

3 of 3 people found this helpful.
20

Thanks for responding Dan. I've replaced the crank sensor - the obd reading confirmed that - unfortunately it still has the no bus reading & won't start. Any other suggestions? We're thinking possibly the pcm ? Where is the bus comm center located . Thanks

1 of 1 people found this helpful.
12,085

well before you replace the PCM try resetting it, simply remove you negative wire on the battery put the key in the ignition and hold it in the start position for like 15-20 seconds turn the key all the way off and reconnect every thing, if that doesnt fix the problem then replace the PCM unfourtunately haviing never done the job on a dakota i dont know where the PCM is located

4 of 4 people found this helpful.
12,085

i also do not know the location of the bus center on the vehicle either

1 of 1 people found this helpful.
20

Ended up being the PCM - it wasn't sending the 5 volts to the crankshaft sensor unit. Found one at the junkyard for $80 & back on the road. FYI- both PCM & Bus center are on the passenger wheel well. Dan - Thanks for Your help

1 of 1 people found this helpful.
50

would all this be the same on a dakota with a 5.9l v8 cause im having the same problems?

5 of 5 people found this helpful.
20

Me too same issues changed sensors still notta

2 of 2 people found this helpful.
40

Also check the ground wire coming from the bus. Mine was loose and causing the same problems.

4 of 4 people found this helpful.
10

Hablas espaƱol

1 of 1 people found this helpful.
10

I have same issue

1 of 1 people found this helpful.
20

I have a 2001 Dodge Dakota with a 4.7l and it spins over but won't start last time I drove it it broke down on me and mad a clicking noise then the motor shut off.

2 of 2 people found this helpful.

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