The 5.9 Cummins engine is known for its durability and power, but like any diesel engine, fuel injectors eventually wear out. When injectors fail, you may notice hard starts, rough idling, white smoke, or reduced fuel efficiency. Understanding the 5.9 Cummins injector replacement cost can help you plan maintenance and avoid unexpected downtime.

How Much Does Injector Replacement Cost?

The cost of replacing injectors on a 5.9 Cummins varies depending on several factors, but here is a general breakdown:

1. Injector Price

• OEM injectors: $250–$350 each

• Aftermarket injectors: $120–$220 each

• Full set (6 injectors) may range from $900 to $1,900 depending on brand and quality.

2. Labor Cost

Replacing injectors on a 5.9 Cummins typically requires:

• 3–5 hours of labor

• Labor rates of $90–$150/hour

Total labor cost usually falls between $300 and $700.

3. Additional Parts & Services

You may also need:

• Injector seals

• Fuel lines

• Valve cover gasket

• Diagnostics

These add $50–$150 depending on condition.

Total Replacement Cost Estimate

When Should You Replace Injectors?

Replace your 5.9 Cummins injectors when you notice:

• Excessive white or black exhaust smoke

• Loss of power

• Poor acceleration

• Fuel knock or misfiring

• Bad fuel economy

Ignoring injector issues can damage pistons, valves, or your fuel system—leading to much higher repair costs.

OEM vs Aftermarket Injectors: Which One to Choose?

OEM Pros:

• High reliability

• Accurate fuel delivery

• Long service life

Aftermarket Pros:

• Lower cost

• Good for budget builds or older trucks

If you use your truck for towing or commercial work, OEM-grade injectors are usually worth the investment.

Where to Source Reliable 5.9 Cummins Injectors?

As a professional Cummins parts supplier, LongShine provides:

• OEM-quality 5.9 Cummins injectors

• Fuel system parts

• Turbochargers, sensors, pumps, and more

• Competitive factory-direct pricing

• Fast worldwide shipping

Working with a dedicated supplier ensures you get accurate fitment, stable quality, and long-lasting components for your engine.

Conclusion

Injector replacement is one of the most common maintenance tasks on the 5.9 Cummins engine. Depending on parts and labor, the replacement cost usually falls between $1,200 and $2,700 for a full set. Choosing high-quality injectors and a trusted supplier can help you avoid repeat failures and keep your engine running smoothly.

If you need reliable injectors or other Cummins engine parts, LongShine can provide cost-effective, high-performance solutions tailored to your needs.