The truck would not start after I made a stop yesterday. I went and replaced both batteries, it got me home. I replaced the alternator, it cranked easily. Cut it off, then it would not crank. What could this be?
A no start condition may develop due to an anti-theft system fault. If the drive authorization module fails to recognize the keys, the engine will not start. In many cases, a new module and keys will be needed to correct this problem.
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance.