While driving the SUV shut off, the engine turns over but will not start?

Hi,

In most cases, a crank no start condition is the result of either a fuel-related issue or ignition related. In other words, the engine isn't getting the fuel needed to run or there is a loss of spark to the spark plugs.

It is easy to narrow down which it is. Do this. See if the engine starts if you use starting fluid. If it starts and then stalls, we know it is fuel related. If there is no change, then I need you to check for spark to the spark plugs.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Try this and let me know the results. Additionally, when cranking the engine, see if the tachometer is moving a little. If it doesn't move at all, we may have a faulty crankshaft position sensor.

Let me know what you find.

Joe

Hi,

That changes things. The "no bus" message on the instrument panel indicates a communication problem between various electronic control modules (ECMs) in the vehicle. In modern cars, there are multiple ECUs (Electronic Control Units) responsible for different systems such as engine control, transmission control, anti-lock brakes, airbags, etc.

These ECUs communicate with each other through a network called the Controller Area Network (CAN) bus. The CAN bus allows these modules to share information and work together to operate various vehicle functions efficiently.

When the instrument panel displays "no bus," it suggests that there is a disruption or failure in the communication on the CAN bus. This can occur due to various reasons, such as:

A faulty or disconnected wire or connector in the CAN bus circuit.

A malfunctioning ECU that is causing a communication loop error, disrupting the data flow.

Electrical issues, such as a blown fuse, that are affecting the communication system.

A software glitch or a programming error in one of the control modules.

When the "no bus" message appears, usually people experience problems with starting, shifting gears, or other functions.

So what does that all mean? We need to scan the can-bus. As mentioned, the different modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them. Here is a link that explains how it's done.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Is this something you can do or have done? Also, since there is no RPM movement on the tach, and I assume there is no spark at the plugs, it could be something as simple as a crankshaft position sensor or as involved as a faulty PCM.

Do me a favor. Take a look through this link and let me know if anything mirrors what you've experienced.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Let me know about the scan. If we don't do it, it will become a guessing game, and that can get expensive.

Take care,

Joe