2014 5.3 Sierra "low compression repaired", now Low Oil Level

wink05 · June 24, 2015

With the repairs for the low compression issue, the dealer changed the oil/filter, then after picking up the truck and driving 30 miles, the Low Oil Level message comes up……..pull over, check and oil level is fine. Started the truck, and no message, however about 30 miles later, message comes on again, and this is repeated during the entire trip. So I stopped by the dealer thinking maybe a sensor wasn't connected from the previous repair. However he stated it would require more diagnostics, and would need the truck for at least one day.

All of this is not my normal experience with GM products!!

Any thoughts or ideas before I take it in tomorrow would be appreciated.

fondupot · June 24, 2015

Seems like they didn't get the oil filled all the way. The dipstick may have shown enough, but that could have been from the oil sloshing around while driving

SouthpawHD · June 24, 2015

Seems like they didn't get the oil filled all the way. The dipstick may have shown enough, but that could have been from the oil sloshing around while

Yep. Did you check it cold?

wink05 · June 24, 2015

It was still hot from driving………I let it set about 3 minutes before checking it.

heavyclay · June 24, 2015

If he checked it while hot, relatively short after turning it off and it read full. Wouldn't that mean it could over filled? if more drains for waiting 3-5 mins it's going to add not subtract

And from working in the industry for 15 years, full temp 0W20 oil drains very quick. Quick enough waiting 30-60 seconds is enough for reading.

Oil level sensor goes into upper oil pan. lay down and take a look if the connector is plugged in.

wink05 · June 24, 2015

If he checked it while hot, relatively short after turning it off and it read full. Wouldn't that mean it could over filled? if more drains for waiting 3-5 mins it's going to add not subtract

And from working in the industry for 15 years, full temp 0W20 oil drains very quick. Quick enough waiting 30-60 seconds is enough for reading.

Oil level sensor goes into upper oil pan. lay down and take a look if the connector is plugged in.

Heavyclay, good catch…………one quick look and sure enough the connector was not plugged in. But now it is!!

Thanks a million!!!

heavyclay · June 25, 2015

Awesome! Glad is saved you a trip back to the dealer.

With your truck being so new, those weather seal connector take a little extra push sometimes to seat. Technician may have thought the lock clicked. Then only to vibrate loose

Would you share what the repair was for low compression? I would imagine a new engine or at minimum new short block

wink05 · June 25, 2015

Awesome! Glad is saved you a trip back to the dealer.

With your truck being so new, those weather seal connector take a little extra push sometimes to seat. Technician may have thought the lock clicked. Then only to vibrate loose

Would you share what the repair was for low compression? I would imagine a new engine or at minimum new short block

Sure, copied from my original post on the compression issue:

Just a quick FYI……picked up the truck this afternoon, and written on the repair ticket:

"968 STUCK AFM LIFTER CYLINDER NUMBER SEVEN 4062410 3073 6.70 PERFORMED OBD CHECK P0300. MISFIRE CYLINDER SEVEN. SWAPPED PLUG WIRE AND COIL WITH CYLINDER ONE, DID NOT CHANGE. PERFORMED MULTIPLE INJECTOR BALANCE TESTS USING GDS. ALL BETWEEN 30 AND 40 PSI DROP. PERFORMED DYNAMIC COMPRESSION TEST LEFT BANK ONLY. CYLINDER SEVEN 50 PSI ALL OTHERS 100+ PSI. REMOVED VALVE COVER INSPECTED ROCKER ARMS AND VALVE SPRINGS ALL OK. REMOVED CYLINDER SEVEN PISTON INSPECTED ALL OK PISTON AND RINGS PROPERLY INSTALLED. REINSTALLED PISTON REPLACED TTY ROD BOLTS. REINSTALLED OIL PAN REPLACED PICKUP AND HIGH PRESSURE SEALS. DETERMINED AFM LIFTER PARTIALLY LOCKED NOT FULLY OPENING VALVE. REPLACED BOTH INTAKE AND EXHAUST AFM LIFTERS CYLINDER SEVEN.