Image presents diesel semi-trucks and diesel pickup trucks for Cummins Automotive & Diesel Service who will service semi trucks and pickup trucks for engine repair, rebuild, overhaul and injector service.




For immediate roadside repair, call (971) 832-0739 for mobile dispatch,
or call to schedule an appointment in our full-service shop.

Diesel Truck Repair

Diesel HD Pickup Truck Repair & Diesel Semi Truck Repair

Diesel RV Repair & RV Chassis Repair


Professional ASE certified technicians with computer diagnostic software for Class 3 to Class 8 commercial trucks and medium to heavy duty pickup trucks, the Cummins Automotive & Diesel Service technicians can get from fault to fix quicker than ever with fast and accurate repairs.

From fleet maintenance to personalized overhauls, our technicians can do it all. For years we have been serving northwest companies and individuals with the best quality of diesel truck repair. Call (971) 832-0739.


From extensive emissions diagnostics, maintenance and service to complete engine overhaul, Cummins Automotive & Diesel Service can handle it. Our team is made up of highly trained and certified techs. We service and repair everything from diesel performance upgrades, turbochargers, and diesel engine rebuilds; to transmissions, hydraulics, brakes and everything in-between.

If you have noticed black, blue, or white exhaust, have discovered coolant, engine oil or hydraulic fluid leaking; or are experiencing poor fuel mileage or poor engine performance, give us a call at (971) 832-0739.

Image is a picture of a semi truck to promote Cummins Automotive & Diesel Service, who provides complete diesel truck & RV chassis service, diagnostics and repair service in Oregon.


Image presents picture of emissions gases inside a diesel exhaust system to promote The NOx Defender, the proprietary diesel emissions service in Oregon, Portland, Salem, Beaverton, Tualatin, and other cities, from Cummins Automotive & Diesel Service, to reduce Nitrogen Oxides.

Diesel Emissions Service for diesel trucks & fleets in Oregon with professional ASE certified technicians and computer diagnostics software for Class 3 to Class 8 commercial trucks and medium to heavy duty pickup trucks for fault diagnosis and repair service, now quicker than ever with fast and accurate repairs.

Take a bite out of emissions with ‘The NOx Defender™’, the Cummins Automotive & Diesel Service emissions reduction standard for Oregon trucks that is so effective because ‘the bad stuff can’t take the heat™’. Call (971) 832-0739.

A blocked injector may cause under dosing of urea and reduce DeNox functionality. Urea injection is a key function in the SCR, Selective Catalyst Reduction, NOx reduction system. As government increasingly makes the tailpipe NOx emission standard more stringent, it is critical to diagnose injection faults in order to ensure SCR DeNox functionality and performance.


“Anyone looking to get their truck repaired in the Portland area, this is the spot. Great, honest services at a fair price. They also gave me a car for the day to run errands. Thanks Seamus.”

– Eric J.
Image of a caution banner to separate off the Cummins Automotive & Diesel Service  customer input in the Customer Comment Area.

“Great place for work on my dodge ram diesel pickup. Really great customer service. Will use again in a minute.”

– Jeff F.
Image of a caution banner to separate off the Cummins Automotive & Diesel Service customer input in the Caution Engine Overhaul Area.

“Great shop for owner operators. Had a computer problem. Turns out I had a broken battery cable. Shemus (Seamus) gave me a great deal. Honest shop!.”

– Bill B.
Image presents the diesel engines Cummins Automotive & Diesel Service will repair, including Cummins, CAT, Caterpillar, Detroit, Duramax, International, Mercedes-Benz, Power Stroke and more.


Cummins Automotive & Diesel Service will maintain your commercial fleet of vans and trucks.

Consistent fleet maintenance translates to more uptime to maximize profits. Minimize truck investment risks, improve efficiency and productivity, reduce transportation costs and ensure emissions compliance. To get started, call (971) 832-0739.

Image presents a semi-truck fleet to promote Cummins Automotive & Diesel Truck Fleet Maintenance Service in Oregon, from the Bend central Oregon area, to the Eugene and Florence area, north to Astoria, Portland and The Dalles, Oregon areas.


Image presents the logo for Cummins Automotive Diesel Semi Truck & RV Automotive Mobile Roadside Repair Dispatch Service in Sherwood Oregon that serves the northwest, northern, central and Willamette Valley areas of Oregon.

Request mobile roadside repair service.

Call (971) 832-0739

Emergency mobile dispatch to highways for complete roadside repair of semi trucks & RV motorhomes with chassis repairs from engine to transmission and drivetrain to wheel hubs, in Oregon and Washington.

Minimize downtime. Get back on the road fast.


Cummins Automotive & Diesel Service will do both in frame and overhaul (out of frame) diesel engine rebuilds. Overhauls can include, more or less, piston & liner kits, or re-bore kits, main bearings, rod bearings, thrust washers, overhaul gasket kit, front & rear crankshaft seals and 6 pack of injectors.

If you have black, blue, or white exhaust, it may be a sign your cylinders are burning oil or coolant. Poor fuel mileage or poor engine performance may be signs an overhaul is needed. Give us a call at (971) 832-0739.


Chevrolet GMC Duramax 6.6L
Dodge RAM Cummins 5.9L & 6.7L
Ford Power Stroke 7.3L, 6.0L, 6.4L, 6.7L
Mercedes Benz MBE 900


Cummins Automotive & Diesel Service offers diesel emissions service and diesel engine maintenance & repair solutions for Class 3 through Class 8 vehicles, including semi truck tractors, medium duty pickups, heavy duty pickups, and vans:

Mobile On-Site Emergency Service Truck & RV Repair
Call (971) 832-0739

Class 3 – 10,001 to 14,000 lbs.

Heavy Duty Pickup, Walk-In Van, Box Truck, City Delivery

Class 4 – 14,001 to 16,000 lbs.

Large Walk-In Van, Box Truck, City Delivery, Commercial Medium Duty Trucks

Class 5 – 16,001 to 19,500 lbs.

Bucket Truck, Large Walk-In Van, City Delivery, Commercial Medium Duty Trucks

Class 6 – 19,501 to 26,000 lbs.

Beverage Truck, Single Axle Truck, Rack Truck, Commercial Medium Duty Trucks

Class 7 – 26,001 to 33,000 lbs.

Medium Semi Truck Tractor, High Profile Semi, Refuse Truck, Furniture Truck, Delivery Truck, Tow Truck, Commercial Heavy Duty Trucks

Class 8 – 33,001 lbs. & Over

Heavy Semi Truck Tractor, Semi Sleeper, Cement Mixer Truck, Dump Truck, Delivery Truck, Van, Commercial Heavy Duty Trucks

Full Semi Truck, Medium Duty Pickup & Heavy Duty Pickup Repairs Shop

  • Certified heavy duty technicians
  • Diesel emissions service
  • Comprehensive troubleshooting
  • Computer diagnostics testing
  • Differential repairs or rebuilds
  • Engine rebuilds or overhauls
  • Full clutch replacement
  • Full electronic diagnostic
  • Transmission rebuilds

We will get your semi-truck or heavy duty pickup back on the road as quickly as possible and will attempt to accommodate your schedule. If you want to leave your truck without worry, then we are the shop for you. Need someone to repair your rig on the side of the road fast? No Problem. We will send a certified heavy duty technician.

Types Of Heavy Duty Diesel Trucks Repaired

Cummins Automotive & Diesel Service certified technicians provide diesel emissions service and work on diesel truck engines, and the chassis, transmissions and drivetrains of most makes and models of medium duty pickups, heavy duty pickups, commercial medium duty trucks, commercial heavy duty trucks including semi-trucks and tractor trucks, of the following makes and brands:

CAT Caterpillar Repairs
Chevrolet Heavy Duty Trucks Repairs
Cummins Engines Repairs
Detroit Engines Repairs
Duramax Engines Repairs
Ford Heavy Duty Trucks Repairs
Freightliner Trucks Repairs
GMC Heavy Duty Trucks Repairs
International Trucks Repairs
Kenworth Trucks Repairs
Mack Trucks Repairs
MBE Mercedes Benz-Designed Engines Repairs
Peterbilt Trucks Repairs
PowerStroke Engines Repairs
Volvo Trucks Repairs

Looking for diesel emissions service or a semi truck repair shop near me? No problem! We have more than a decade of experience in mobile emergency services and can give you piece of mind with a certified, heavy duty technician mechanic ready for mobile dispatch who will:

  • Field your call
  • Respond with a fully tooled heavy duty service truck that includes common parts
  • Troubleshoot your heavy duty repair issues
  • Give overall assessment with service and cost saving recommendations
  • Repair your truck and get you back on the road fast

Whether you are broken down on the side of the road and need our mobile emergency service truck or need to bring your semi truck into our full-service shop for repair or diesel emissions service, we are here to help you. Call us now at (971) 832-0739 and get a heavy duty technician on the phone. We will work to save you expensive downtime.

Image presents a picture of a Mack semi truck to promote Cummins Automotive & Diesel Service who provides diesel truck engine repair, maintenance, rebuild and overhaul for Oregon truck owners, operators and businesses.