Q: Issue

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Was driving down the road truck to shut off just like you turned off the key. Replaced crank sensor now the vehicle will start then immediately die. Sometimes it won't even start just won't turn over. Also seems like the battery is draining very quickly since this issue started.

My car has 250000 miles.
My car has an automatic transmission.

It sounds as if you have multiple problems. I would begin by charging the battery and keep the charger on it until you get the truck to run.

If the truck died and there were not any lights illuminated on the dash, then you should be looking for a blown fuse or fuses. There are multiple fuses that supply power to the dash and the PCM. If the dash lights are on, then you will need to perform a more comprehensive diagnosis.

To diagnose the dying problem, you should check fuel pressure, injector pulse, spark, and watch scan data for crankshaft and camshaft sensor signals. With these tests you will find out what is missing and you can continue your diagnostic direction from there. Once you get the truck running, you should check the charging system by monitoring system voltage at the battery and amperage from the alternator. This is best done with a carbon pile.

If the battery is draining very quickly, you need to test this with a amp meter. Most multimeters won’t carry over ten amps, so you will need what is known as an amp clamp.

You don’t need to buy one as expensive as this. If you do indeed have a draw on the battery, with the amp clamp around a battery cable, begin pulling fuses one at a time. If when you pull a fuse the draw goes away, you have found the circuit that is pulling current from the battery. Be sure to put each fuse back in before moving onto the next one. Good luck.

I’f you feel like you need some assistance with this, contact a certified mechanic who is capable of diagnosing your starting problem as well as the battery battery issues. One this is done, the proper repairs can be made in order to get your car running normally again.

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