2018 Chevy Malibu LT won't start

olds366 said:

While driving I got a reduced engine power message. Had a diagnostic don't have code camshaft sensor, crankshaft sensor, and hard break. All sensors have been changed, and vacuum pump. Also went ahead and changed throttle body and sensor. Car started and ran for 30mins now won't start again. Help please, has anyone had this issue?

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I do not follow the statement above. Is that an accidental "don't"?

For me to offer advice I need to know what those codes were before replacing every sensor and pump and what the current codes are.

Sorry yes, that was a typo. The codes were P0014 POO17 PO556 P1101.

It's still giving P1101

P1101 is rarely fixed by replacing the MAF even though by old definitions it points that way. GM defines it a bit more broadly to intake system airflow performance out of range. It is almost always fixed by cleaning the throttle body, returning to the stock air filter and box of modified, or cleaning or replacing the camshaft cover PCV orifice. The last fix is the easiest to diagnose but also the most costly/time consuming. You can go test for excessive crankcase pressure which indicates sludge and clog.

The P0556 is the code that often comes with vacuum pump failure. Did your pump disintegrate at all?

Yes, pieces were removed from engine( no injectors were pinched). Both camshaft sensors replaced, crankshaft sensor replaced, vacuum pump replaced.

Ok. If the vacuum pump was oil starved and broke up there is a chance the PCV system is clogged since you have that code. Here is a bulletin discussing P1101 and the excessive pressure, how to test, etc.

Ok we will try that. Thank you

Crank pressure being ok is great - fixing that is a hassle.

That oil could be from the vacuum pump change. It loses a little oil when that is removed as the exhaust camshaft is exposed. That is the exact spot it drains to.

I have no idea what's wrong with then. Hate to take it to dealer with killer prices.

Loose bolts on intake manifold will cause all of these problems known to be loose from the factory

bradnoble1621 said:

Loose bolts on intake manifold will cause all of these problems known to be loose from the factory

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That is specific to the Gen 8 2.5L and wasn't from the factory; if it was from the factory cars would have stalled or tossed codes rolling off the lot. It is always possible intake manifold bolts could be loose on a gen 9 1.5 or 2.0 over time but it's never been reported in eight years.

olds366 said:

I have no idea what's wrong with then. Hate to take it to dealer with killer prices.

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What did the dealer say was wrong with your car if you dont mind me asking? And how did they fix it?

olds366 said:

I have no idea what's wrong with then. Hate to take it to dealer with killer prices.

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I only ask because my 2017 Chevy Malibu LT brakes got hard out of nowhere when I was driving. I got to my mom house and wasnt able to start car. Replaced the vacuum pump, brake booster, injector seals, and sensors and my car will crank/start but still not start/turn over and I am kind of stumped right now. May you help me out and let me know how they fixed it for you please?

As a kindness regarding terms that you're using interchangeably, when an engine "turns over", it is cranking, or more specifically, it is being cranked by the starter motor.

When an engine is no longer cranking, it is running or has started.

When you take your car to a shop, let them know that your engine will crank or turn over, but will not start.