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What causes the oil pressure gauge on your 2004 GM Sierra 2500 Heavy Duty 6L to drop off when it rains Shut engine off for 5 minutes and it goes back to normal?
The drop in oil pressure gauge on your 2004 GM Sierra 2500 Heavy Duty during rain could be due to moisture affecting electrical connections or sensors, leading to erratic readings. Rainwater might seep into areas like the engine compartment, impacting the oil pressure sending unit or wiring. When you shut off the engine, the moisture may dissipate, allowing the system to reset and function normally again. It’s advisable to check for any signs of water intrusion or corrosion in the electrical components related to the oil pressure gauge.
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