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.
The cost of replacing injectors on a 5.9 Cummins varies depending on several factors, but here is a general breakdown:
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.
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.
You may also need:
Injector seals
Fuel lines
Valve cover gasket
Diagnostics
These add $50–$150 depending on condition.
| Service | Estimated Cost |
|---|---|
| Parts (single injector) | $120–$350 |
| Full set of injectors | $900–$1,900 |
| Labor | $300–$700 |
| Misc. parts & seals | $50–$150 |
| Total (full set) | $1,200–$2,700 |
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 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.
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.
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.