The oil pump in your 2019 Dodge Challenger's Hemi V8 is responsible for maintaining the lifeblood circulation that keeps internal components alive. When this critical component begins to fail, the consequences can range from annoying noises to complete engine destruction. Recognizing the warning signs early can mean the difference between a repair bill and an engine replacement.
What the Oil Pump Does
The Challenger's oil pump—driven directly by the crankshaft—pressurizes oil and circulates it through galleries feeding the crankshaft bearings, connecting rod bearings, camshaft, lifters, and other critical components. The 5.7L and 6.4L Hemis require steady oil pressure between 25-65 PSI depending on RPM and temperature.
Warning Signs of Oil Pump Problems
Low Oil Pressure Gauge Reading
This is your most direct warning. If the oil pressure gauge shows lower-than-normal readings—especially at idle—the pump may be losing efficiency. Modern gauges are often simplified, so a reading that used to sit mid-scale now hovering near the low mark deserves attention.
Oil Pressure Warning Light
If this light illuminates, you have critically low oil pressure. Pull over immediately and shut off the engine. Running an engine with the oil light on causes rapid bearing damage.
Engine Noise
Without proper oil pressure, metal-on-metal contact increases. Symptoms include:
- Ticking or tapping from the valve train
- Knocking from the bottom end (rod bearings)
- Rumbling or grinding sounds
- Noise that increases with RPM but isn't exhaust-related
Increased Engine Temperature
Oil carries heat away from bearings and other components. Reduced flow means reduced cooling, potentially causing elevated engine temperatures even with a healthy coolant system.
Lifter Noise or MDS Problems
The Hemi's hydraulic lifters and MDS system require consistent oil pressure. Pump issues often manifest first as lifter tick or MDS malfunction codes.
What Causes Oil Pump Failure
Wear and Age
Oil pump gears and bearings wear over time. While designed to last the engine's lifetime, high-mileage engines or those with inadequate maintenance may experience wear-related failure.
Debris Contamination
Metal particles from internal wear or neglected oil changes can damage pump internals. The pump draws oil through a pickup screen, but microscopic particles pass through and cause wear.
Oil Starvation
Running low on oil—even temporarily—forces the pump to work harder and can cause damage. Aggressive cornering that sloshes oil away from the pickup (less common in street driving) also causes momentary starvation.
Pressure Relief Valve Stuck
The oil pump includes a pressure relief valve that opens when pressure exceeds specifications. A stuck-open valve causes chronically low pressure even with a healthy pump.
Diagnostic Steps
- Verify oil level: Ensure proper oil level first. Low oil mimics pump failure symptoms.
- Mechanical pressure test: Install a mechanical oil pressure gauge for accurate readings. Don't rely solely on the dashboard gauge.
- Check oil pickup tube: A clogged or damaged pickup tube restricts flow to the pump.
- Inspect oil filter: A collapsed filter element restricts flow. Cut open the old filter looking for debris.
- Check pressure relief valve: With the pump removed, verify valve operation.
Repair Costs
- Mechanical oil pressure test: $75-$150
- Oil pickup tube replacement: $400-$800 (requires oil pan removal)
- Oil pump replacement: $800-$1,500
- Engine rebuild (if damage occurred): $5,000-$10,000+
- Engine replacement: $8,000-$15,000+
Prevention
- Change oil every 5,000-6,000 miles with quality synthetic
- Never ignore low oil level warnings
- Address any oil leaks promptly
- Don't ignore unusual engine noises
- Monitor oil pressure regularly during driving