Skip the auto shop - Our mechanics make house calls

Q: will crank but wont start

asked by on

the 96 engine was put in a 99 key was misplaced mechanic who put it in has not come back went to dealer to get a key using the vin on the truck got vehicle to crank but wont start. plugged in a coder and came back A Bus that the computer is fried. Got a computer for 96 dodge ram 2500 v10 put in same thing came up. The new person that I had put in the computer from the salvage yard is at a loss. I have researched a little and think that we didnt match numbers of the truck vin that the 96 came out of to the computer we got and maybe something with the starter and key I got from the dealer with the vin on the 99 truck. Dont know where the mechanic that put the 96 engine in the 99 left off got the same A Bus with the replacement computer What needs to be done. The second mechanic says he checked fuses crank sensor and also battery sounds like its going dead. Dont think this mechanic wants to figure it out. What needs to be done.

My car has 88000 miles.
My car has an automatic transmission.

A: Ill try to answer this without getting too ...

Ill try to answer this without getting too technical. Your vehicle uses two network communication circuits, called busses, to communicate with all the different modules. Like any circuit, it requires a complete path with no breaks to operate. It is easy to miss connecting a small wire when performing a large job such as an engine replacement.

I suggest you refer to the factory service manual for detail information about were your grounds are connected and test procedures to verify that all modules have both power and ground source as well as a complete communications pathway. A missing or improper ground will prevent your modules from communication and is often misdiagnosed as a bad module.

A certified technician, like one from YourMechanic.com, will have the tools and knowledge to diagnose your starting issue and verify the proper operation of your can bus circuits.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car not going into gear all of the time.

Hello, you are experiencing a linkage issue that need to be looked at sooner than later. The transmission may leave you stranded stuck in a gear and not able to engage park. If this happens engage the parking brake to...

Q: Brake drums

Hey there, thanks for your question. I would replace it with a bolt. It's easier to take off and put back on just in case you ever have to replace the cable for some reason. If you are still having...

Q: Stopped moving in forward and reverse

Hello. This could potentially be transmission bands that may need to be adjusted. Also, check to be sure your transmission cooler is working as it should as well. There is also a transmission control module that can sometimes be the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.