Diesel Engine Service & Repair

Ford PowerStroke, Dodge Cummins & Chevy Duramax — Rancho Cucamonga, CA

From a rough idle to a full rebuild, the engine is where we live.

We diagnose carefully before we touch a thing — no guesswork, no throwing parts at the problem.

714-470-7478 · 8880 Archibald Ave Unit H, Rancho Cucamonga, CA 91730

Diesel engines seldom fail randomly — there's always a reason, and finding it is our job.

A check-engine light, a coolant leak, a turbo that's lost its punch, or low power and bad fuel mileage all trace back to something specific. We run the diagnosis first, show you what we find, and fix it right the first time.

Whether it's an emissions code, a DPF problem, or a tired engine that needs a full rebuild, we've got the bays, the OEM parts on the shelf, and the diesel experience to get your truck back to work.

»  Digital Inspections Now Available

Buying a used diesel? Get a full pre-purchase digital inspection — photos included. We walk the truck bumper to bumper and send you a clear, itemized report straight to your phone, so you see exactly what you're buying before you sign.

Ask about a pre-purchase inspection → 714-470-7478

 

Diesel Truck Engine Services

Everything engine, done right. From check-engine diagnosis to full rebuilds, DPF service, and emissions repair — we diagnose carefully before we touch a thing.

  • Engine rebuilding & diagnosis
  • DPF service
  • Emissions repair & diagnosis
  • Cooling system repair & diagnosis
  • Turbo replacement & diagnosis
  • Check engine light diagnosis
  • Exhaust service & replacement
  • Intake service & replacement
  • Accessory belt replacement
  • Charging system diagnosis
  • Battery replacement & service
  • Motor mount replacement
Diesel Engine Rebuilding

CAREFUL DIAGNOSIS

We Diagnose First — Always

Diesel repair gets expensive fast when a shop guesses. We don't. Every engine job starts with a careful, methodical diagnosis so you're paying to fix the actual problem — not to find out what it was. Done right the first time, never rushed.

Engine Diagnoses

PARTS & WARRANTY

OEM Parts, Backed in Writing

  OEM parts only, covered by a 2-year / unlimited-mile warranty
  NAPA parts covered by the NAPA 12-month / 12,000-mile warranty
•  All OEM filters in stock and a large parts inventory — less downtime waiting on parts

Let's Diagnose It Right

Call Mad Tech Diesel Workz and get a straight answer from a shop that specializes in diesel.