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Posted (edited)

I'm doing my best to isolate this ticking sound that is persistent, yet intermittent. 

 

Data so far: 

2018 CC SLT 1500 6.2L 4WD Max Tow 19K miles, all stock

  • Doesn't happen when motor is cold, much more prevalent when motor is warmed
  • Doesn't happen when letting off throttle (only under application of throttle), can be heard in neutral, park, and in drive (not in reverse enough to tell--but it happens when transmission is not engaged)
  • Sound follows steady or increasing RPM of motor
  • Under light to medium load, noise is prevalent, under heavy acceleration it subsides (not because of engine noise)
  • If I turn wheels hard left, the noise disappears, straighten wheels, it returns (like wheel is blocking noise from traveling)
  • Sound only heard on driver side
  • If I hit some oscillating bumps on the road, it can stop for a while before returning back (under varying loads as well)
  • If left in tow/haul mode, at 2500 rpm under light load it can still be heard
  • Ran 2 bottles of Red Line injector cleaner and it didn't eliminate/help noise
  • The truck was silent until the 700 mile mark and I hit an expansion joint (nothing out of the ordinary) and the sound started and has remained ever since
  • I've checked exhaust/manifold connectors and no sign of leaks (soot)
  • I put a hollow aluminum rod (2 foot long) to the vacuum pump and did not hear any abnormal noises directly from the pump
  • Obviously heard injector noises when put to the injectors; haven't had chance to stop on side of road when the sound disappears to run comparison tests
  • Sometimes it'll run dead silent when driving down the road (after complete warm up) and power delivery doesn't change but noise comes back within a minute or two
  • Sound heard in both V-8 and V-4 modes, and while in manual shift mode
  • Use premium 91 gas ever since purchase (93 not available in Bay Area)--use Costco Top Tier fuel (high volume station)
  • Oil changed with Mobil 0-20W Full Synthetic every 5K miles religiously and OEM filters (indicator usually states 37% remaining at around 5k miles)
  • 90/10 Highway/City driving

 

Any thoughts? My MPG is seems close to normal. Lifetime average of 17, most of my time driving is short city trips or long highway driving with a bed full of gear and a dirt bike. 

 

Some of the actions seem like it could be a noise related to the vacuum pump but the pump doesn't exhibit any noises itself. Sounds kind of like exhaust leak--exhaust seems to check out (no notable soot around connections or along piping that is visible). If it was something loose, I would think that even under deceleration (letting off throttle) would cause the noise to persist. It follows increasing RPM. 

 

I've checked around the footwell and haven't noiced any plugs missing or issues there. The fact that the sound is not there when cold or after some bumpy roads makes me think something else is up. 

 

Thoughts? Things to check? 

 

When it is quiet, this truck is wonderful. The ticking in the background that comes and goes is like a form of Chinese water torture. The fact that it does go away sometimes makes me even crazier as I know it could be better. When I bought it, it did not make this noise. Only after 700 miles of driving did it begin to tick tick tick away. 

 

 

 

 

 

 

 

 

Edited by madsen203
Additional information added

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I've had this noise for a year and a half. I recently had my vacuum pump replaced and the steering shaft boot. The noise was gone for a month but it is now back but not as loud. So either my new vacuum pump is starting to crap the bed or the steering shaft boot is not seated properly. I personally think it's the boot 

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I hear the same noise, I believed it to be the injectors firing. Honestly I never noticed it till I was in the truck with two other people in in and the radio was off as we we're talking. During the times of no conversation I began to notice it. It's very faint. And now that I've heard it once, it's like I hear it every time , it's very very faint and only hear if the radio is off and no one is talking.

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I am 98% sure it is this. The noise dissipating when turning left led me to finding this. Thanks GM forums! 

 

Also thanks to this forum I found the TSB that addressed the rear back up camera at full brightness at night. The dealer checked the lifters and all is fine. Ready to get this over and done with! 

 

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I have a ticking from passenger door. I think it’s one of the lock or window switches

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I am 98% sure it is this. The noise dissipating when turning left led me to finding this. Thanks GM forums! 

 

Also thanks to this forum I found the TSB that addressed the rear back up camera at full brightness at night. The dealer checked the lifters and all is fine. Ready to get this over and done with! 

 

 

**UPDATE**

 

The dealer acknowledged this was the cause and is replacing the seal. Woot!!! 

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