chevy 1.4t ecotec squeaking noise chirping sound 

After I did all your points. I checked out the spark plugs and found one of the port’s with an oil film. And checked the torque and, pulled out the plug. There’s was oil on the plug. Cleaning it and putting it back in and torque. All is good. 40,000 miles on a 2016 Chevy cruise. Thanks for your posting.

Very grateful for your thorough description of the PCV system. Thank you! I'm chasing rhe same stupid chirp on my own Sonic.

Bro thanks, really saved some money on it, The pugs wasn't tight.

Try unscrewing the coil pack, pull it up slighly. Turn on the the engine, then wiggle the coil pack up and down or side to side. See if that makes changes the volume of the chirping. It could be a problem with loose spark plugs, coil boots or the coils. The chirping could actually be arcing. I had a similar problem with my 2013 Cruze 1.4 Ecotec. It was resulting in poor gas mileage and sluggish acceleration.

A new crankshaft seal fixed this sound on my end. This video was extremely useful, keep up the good work!

had the exact same issue. just fixed it and it was a loose spark plug pushing compression past the rubber boots on the coil pack.

I have an 05 outback xt quite modified.. New engine build with a lot of customizations.. The comments and the video categorically nailed down the issue topic I'm having by trying the oil fill cap on then off etc. Clearly my level of vacuum is causing the reed effect of a wind instrument somewhere. I'm not convinced mine is my rear main seal which everyone here keeps calling crank seal.. The majority of seals on the engine are subject to the crank case pressure. The entire valve cover gaskets, the "front crank seal" ie oil pump seal, the rear, all 4 cam seals, the oil pan, the oil pump, brake booster, all your PCV system, probably more. But yea, the shaft seals - cam and crank - that's interesting.. Mine almost sounds like a passenger side cam seal.. Then again passenger side valve cover as well. Still haven't pin pointed mine, but everyone was saying turbo... So turbo air and oil are also culprits technically.

if you tighted your spark plug and your issue was fixed I envy you

Spark plugs. Just had the same issues with a 2019 chevy trax. Turned them at least 1 to 1.5 full turns. I have been working on cars for a long time. Have to say that is the first time I have ever had that happen.

Like others have said. It's the crankshaft seal. It may also be the valve cover if you are unlucky. Be aware checking the plugs will very likely result in torn boots. There are numerous service bulletins from GM. It's a common problem. New crankshaft seal cost me $150 installed here in Canada in June 2023.

I have a 2013 sonic 1.4 manual transmission but i need to know what tupe of fluid and how many quarts i need to pour in it please thanks in advance

We had a similar sounding Noise. It was the generator, there ie a very thin layer on the rotor that had contact

same exact freaking sound! it must be pcv, recently even got the check engine light for it, luckily its covered by gm so hopefully they fix it, and sound disappears

I just replaced my plugs and ignition coil now I'm getting a chirping noise when I accelerate. I hope it's just a loose plug or something.

Have a 2009 Chevy Malibu ltz. Same exact sound. Says pcv us built into the intake manifold. Took that off and cleaned ports. Still making the noise. When removing the oil dipstick, it stops

Several mechanics have told me that there are two crankshaft seals, one near the gearbox and one near the engine. Is this the one near the engine? and the other also?

I just replaced the valve cover and car is still squeaking any opinions please let me know

Bro thank you... mine was actually a lose spark plug from the last idiot who worked on her

Its the crank shaft seal! - Not the PCV valve in the top cover, nor the belts, nor the pulleys, nor the water pump, altinator, air-con etc. Been there done that. drove me mad, spent a lot of time, money and frustration. Got the crank shaft seal changed, Happy Days!

Same noise in my buick encore 2015. Changing Crankshaft seal, fix it.