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Posted

Is there any update on this? My 2018 1/2 ton did this this morning for the first time, it normally sits at ~40 and started today revving to 60+ and falling to ~25-30 psi w/ the engine. Is this normal or is there an issue that the dealers found? 

  • 2 years later...
Posted

I noticed this today on my 2014 Sierra 5.3 while on the interstate.  It usually sits about 40 but it quickly jumped up to 55ish and back down. After I stopped for gas and took off I noticed it did it again. I sure hope it is the teo stage pump self test. 82K miles about 2K since last oil change and level is at top mark.

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