Diesel Repair in Sacramento

Heavy-duty diesel mechanics — not a pickup shop

Search “diesel repair” in Sacramento and half the results are shops built around pickup trucks. This isn't that. Pro Truck Services works on commercial diesels — semis, box trucks, and the working equipment that earns its keep by the mile — at our North Highlands shop and on-site where the truck sits.

Running a diesel pickup? We're built around class 7–8 trucks and commercial equipment; a light-duty diesel specialist will usually serve a personal pickup better.

What our diesel mechanics handle

• Engine diagnostics and repair — derates, no-starts, power loss, smoke, hard starts
• EGR & DPF service — the aftertreatment problems that dominate modern diesel downtime
• Fuel systems — injectors, pumps, filters, air intrusion, winter gelling
• Cooling systems, electrical diagnostics, and transmissions
• Preventive maintenance on working-truck intervals

Brands we service: Peterbilt, International, Freightliner, Dodge, Volvo, Mercedes-Benz, Kenworth, Mack, Isuzu, and Hino — with dedicated engine-platform service for Cummins, Detroit Diesel, PACCAR MX, and Volvo D-series.

Shop or roadside

Bring it to 3036 Orange Grove Ave in North Highlands — on the I-80/Watt Avenue corridor — or call for emergency and mobile diesel repair when the truck can't come to us. English and Russian spoken.

How a diesel gets diagnosed here

1. History first. When it started, what changed, which lamps, how it behaves cold versus hot and loaded versus empty. Half the diagnosis is in those answers.
2. Every code, active and stored — then separating the root fault from the cascade it dragged behind it. One failed sensor can set five codes; replacing five parts fixes none of them.
3. Physical tests before parts. Fuel supply and return pressure, air-in-fuel checks, boost and charge-air leak testing, cylinder-contribution tests, cooling-system pressure, crankcase pressure. Diesels fail mechanically more often than electronically, and a scan tool cannot see a soft hose.
4. A written estimate you approve before any repair starts — what was found, what it needs, what can wait.

What Sacramento duty cycles do to a diesel

The Valley works engines in specific ways. Summer heat loads cooling systems, EGR coolers and charge-air coolers hardest exactly when trucks are busiest. Dock and yard time means idle hours that never get the exhaust hot enough for passive regeneration, so aftertreatment fills faster than mileage suggests. Short vocational runs dilute oil with fuel and never fully dry out crankcases. Grades on I-80 toward the Sierra and on US-50 punish cooling and turbochargers on the climb and brakes on the way down. Those patterns decide what we look at first — and why intervals set from how a truck actually works beat the sticker on the door.

Shop, mobile, or roadside

• Shop — anything internal to the engine, fuel-system work needing a clean bench, transmissions, and jobs that need a lift or press.
• Mobile — diagnostics, sensors, belts, hoses, batteries, charging, air leaks, brakes and PM at your yard, scheduled around your operation.
• Roadside — the truck is already stopped; we come to it, fix what can be fixed safely on the shoulder, and arrange a tow when it cannot.

Common questions

Are you a diesel mechanic shop or a truck repair shop?

Both, because for commercial trucks they're the same job. The distinction that matters is heavy-duty versus pickup — and we're the heavy-duty side.

Do you work on diesel pickups at all?

Our bays, parts, and diagnostics are set up for commercial trucks. For a personal diesel pickup, a light-duty specialist is usually the better fit — call and we'll tell you straight either way.

Can you diagnose a diesel that has no warning lights?

Yes — plenty of diesel faults never set a code. Fuel supply, air leaks, cooling, and mechanical wear get found with testing, not just a scan tool.

Do you repair Cummins, Detroit, PACCAR and Volvo engines?

Yes — each has its own page because the diagnostic paths differ: Cummins, Detroit Diesel, PACCAR MX and Volvo D-series. The badge on the hood tells us which one to open.

Is a diesel “tune-up” a real service?

Not in the spark-plug sense. What restores a tired diesel is specific: valve lash adjustment on engines that need it, injector testing, fuel and air filtration, charge-air leak repair, and a clean aftertreatment. Ask for those by name and you will get an honest answer about which ones your engine actually needs.

How do you tell a fuel problem from a turbo problem?

By measuring both. Fuel pressure and return flow under load say whether the engine is being fed; boost against spec and a charge-air pressure test say whether it is breathing. Low power with black smoke usually means air; low power with no smoke usually means fuel. Guessing replaces the wrong one.