Oil Pressure Gauge Fluctuation After Startup and Over 3700 RPM

GM Tech Tip: Oil Pressure Gauge Fluctuation After Startup And Over 3700 RPM

The customer may comment that the oil pressure gauge jumps from approximately 40 lb. to 60 lb. three times within the first few minutes of driving as well when the engine revs past 3700 RPM.


Models:

2015-2018 Cadillac Escalade 6.2L L86
2014-2018 Chevrolet Silverado/GMC Sierra 1500 4.3L LV3 5.3L L83 6.2L L86
2015-2018 Chevrolet Suburban/Tahoe/GMC Yukon 5.3L L83

Condition
The customer may comment that the oil pressure gauge jumps from approximately 40 lb. to 60 lb. three times within the first few minutes of driving as well when the engine revs past 3700 RPM.

Cause
The 4.3L (LV3), 5.3L (L83), 6.2L (L86) engines are equipped with a two-stage oil pump.

The oil pressure gauge jumping three times is caused by a test routine the engine goes through during the first few minutes of driving to ensure that both stages are operable.

The oil pressure gauge going to 60 lb. over 3700 RPM, is the calibrated engine speed the oil pump goes into the high-pressure stage.

No repairs should be attempted, this is normal operation for these engines.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

You May Also Like

Beyond the Warranty

What does it take to keep a car going for 120,000, 180,000 or 250,000 miles? The key is maintenance and inspection. 

Step up maintenance to go farther

What happens after the bumper-to-bumper warranty and powertrain warranty wear out? If you look at any factory-recommended service intervals, after 100,000 miles they cease to exist.

What does it take to keep a car going for 120,000, 180,000 or 250,000 miles? The key is maintenance and inspection. 

Misfire Codes P0300, P0301-P0312 and P0313+P0314

The only way to clear the code is to use a crankshaft position relearn with a scan tool.

What Caused The Turbo To Fail?

Up to 50% of turbocharger failures are due to oiling problems.

Valve Lifter Technology

Hydraulic lifters are precision-fit assemblies.

Supercharger Pros And Cons

Customers generally look to superchargers for the instant throttle response, not fuel economy.

Other Posts
It’s Got Spark!

Why can’t you trust some spark tests?

Belts and Pulley Alignment

A misalignment of the plane of the belt can occur when a pulley is not parallel to the other pulleys on the belt drive system.

Diagnosing Misfires

What if there are no codes and a misfire is intermittent? This is where it gets complicated.

Lifter Deactivation

The area of contact between the lifters and cam lobes is the highest loaded surface inside an engine.