I sure someone can help with this problem.
First I have a 2000 Dakota Sport 2 WD 3.9 Lt with Automatic Transmission 132,000 miles
The truck will turn over but will not start.
So far I have done the following: 1. Replaced the crankshaft position sensor both in the distributor and on the transmission, 2. Replaced the speed sensor in the differential. 3. Replaced fuel pump, 4. Replaced spark plugs and plug wires and had injectors checked.
Each time this has happened I have had it towed to garage where it starts like a champ. It has been giving P0305, 0301 & 0303 codes indicating misfires but the truck is running like a champ. The other day a "no bus" code was given which I see online indicated a defective PCM. I have taken truck to the local Dodge dealer and had the PCM diagnosed and nothing found wrong.
Dealer said it MIGHT be Central Timing Module but not sure.
I really don't want replace the truck piece by piece.

Although the truck is a 2000 it is spotless. A year ago I had the truck completely gone over with all dents, scratches etc. taken out and repainted.
The really bad thing is that I just gave the truck to my grandson for his 16th birthday and I want to make sure it is safe and reliable for him.

Please help if you have any ideas. If necessary I will replace the PCM

 

Welcome to the forum.

Do you have spark? Do you have fuel? Does it only happen when hot or will it do it cold - as in sitting overnight. It could be the PCM.

It could be lots of things.

The CTM has nothing to do with the engine starting.

 

As for fuel yes. Pump replaced and pressure good. As for spark i have shown my grandson how to check if it does the no statt condition.

 

While a good indicator, having fuel pressure alone doesn't mean the injectors are firing. Now if you have the gauge on while it's cranking and can see the pressure pulse as the injectors fire, different story.

As Dan stated, is it weather/temperature dependant?

The misfire codes are all on the odd bank. That tells me that the next thing on the hit list *might* be the O2 sensors/harness. I know on mine (also 3.9) two of the four wires from one of the left bank sensors got on the exhaust, luckily it was the ground so no damage. If it's a voltage line, i could see it doing some goofy things.

 

My daughter is taking truck back to dealer on Thur. I am going forward all info to her.
Thank you.

 

honestly, dealers are usually a rip-off. Though rare, a shade-tree mechanic shop is usually much cheaper and can do most of the same diagnosing. That said, electrical stuff they might be a little more skilled at, but most dealer techs anymore can't function without a computer. Old school folks are more knowledgable about tricks and chasing things down.

 

thankyou i'm going to check that. I think I have a short in the harness and Iv been hunting it. daks are know to have a short under the battery in the wiring harness their that goes to the fuel pump in the top of the tank.. intermittent affect usually which is what I have. but my o2 keep coding out. didn't get 100 miles with two new O2 sensors before they coded again.