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Chevrolet Says Suburban May Have Oil Pressure Problem

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This bulletin applies to 2019 Chevy Suburban vehicles equipped with a 6.0L L96 engine. The engine may have a concern of no oil pressure and/or DTC P0521 set. This may be due to the relief valve in the oil pump sticking or there is damage to the number 1 main bearing.

Check the engine oil dipstick to confirm that the crankcase is not under or over filled. Confirm oil pressure at the main gallery with a manual gauge. If pressure is lower than specification, replace the oil filter. 

If no improvement is found, remove the oil pan and inspect for number 1 main bearing damage. If the bearings are OK, change the oil pump. According to GM, engineering is currently working on a root cause.

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