Intermittent Buzzing Noise

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
Low fluid level	Add fluid to the proper level. Refer to Transmission Fluid Checking Procedure .
Air leak in oil suction filter canister	Replace the oil suction filter. Refer to Oil Pan Replacement .
Clogged suction filter	Replace the filter. Refer to Oil Pan Replacement .
Aerated fluid causes noisy pump	Correct the fluid level. Refer to Transmission Fluid Checking Procedure .
Low main pressure causes main regulator valve to oscillate	Refer to Low Main Line Pressure in All Ranges and Low Main Line Pressure in specific Ranges, Normal Pressure in Other Ranges .