Does your diesel pickup feel sluggish, struggle pulling a trailer, or lose power going uphill?
Low power is one of the most common complaints we hear at Anderson Diesel Service. But
low power is a symptom—not a diagnosis. Finding the cause takes more than reading a trouble code.
From the Symptom to the Source
Here’s how we explain our diagnostic process:
Saying “my truck has low power” is like saying we’re somewhere in Nebraska. The trouble code gets us to the right city. Testing gets us to the right street. Verifying the failed component gets us to the right house.
A code gives us direction. Proper testing tells us what actually needs repair.
A Real Example: Losing Power While Towing
Recently, a diesel truck came in that drove normally around town but lost power on hot summer days while towing uphill. It had set a
P0087 low fuel rail pressure code.
Rather than guessing at a fuel pump or injectors, we duplicated the concern and monitored commanded versus actual rail pressure. Under load, actual pressure dropped below what the engine needed.
We checked the filters, low-pressure fuel supply, restrictions, lines, and pressure relief valve. Those areas checked out.
An injector return test revealed excessive return flow—the evidence we needed to identify the problem.
Why Heat and Heavy Loads Made It Worse
Common-rail injectors normally return some fuel through the return system. Excessive internal leakage, however, can prevent the system from maintaining the required pressure.
As fuel heats up, it becomes thinner and can leak more easily through worn internal clearances. Combine that with increased fuel demand while towing uphill, and the system may struggle to keep up.
That explained why this truck ran normally under lighter loads but lost power when hot and working hard.
Low Power Can Have Other Causes
Not every low-power complaint comes from the injectors. Other causes can include:
- Restricted fuel filters or fuel-supply problems
- Turbocharger issues or boost leaks
- Exhaust or diesel particulate filter restrictions
- Sensor or electrical faults
The tests need to match the truck and its symptoms. Replacing parts without confirming the failure can waste money and leave the original problem unresolved.
Maintenance Matters
Stay current on fuel-filter changes, use quality filters, and follow your truck’s maintenance schedule. Don’t ignore hard starting, rough running, unusual smoke, or repeated fuel-pressure codes.
When you schedule diagnostics, tell us when the problem happens—hot or cold, towing or unloaded, uphill or around town. Those details help us reproduce the concern.
Diesel Diagnostics in Grand Island, Nebraska
At Anderson Diesel Service, we diagnose and repair Power Stroke, Cummins, and Duramax pickups for customers throughout Grand Island, Hastings, Kearney, and surrounding communities.
We test before recommending repairs and explain what we find.
Don’t guess. Diagnose. Call Anderson Diesel Service at
(308) 389-3590 to schedule your truck.
