They refuse to honor their warranty. Paid them $18,000.00 for a new engine and drove 2000 miles and it sucked the air cleaner (That they installed) into the motor. Only way they would work on it was for me to pay them $6000.00 more dollars up front and then they would "Assess for warranty". They claimed it was my fault for not changing the air filter. I am a senior citizen on fixed income, I don't have another $6k to give them. I got screwed. I had owned and driven this truck for over 20 years and managed to take care of it just fine. read more

500 miles from home, our truck had a catastrophic failure. AND we were hauling a 35' 5th wheel trailer. The folks @ Jefferson State took wonderful care of us. They knew we were 'up a creek without a paddle', and they went out of their way to help us out. These are ABSOLUTE PROS. One of the finest companies that I have EVER dealt with. In the future, I'd consider driving back the 500 miles just for routine maintenance! In a world of money- grabbing, dishonest repair shops, the people @ Jefferson State Diesel stand alone as HONEST, RELIABLE FOLK. Thanks for everything guys... read more

So I just got my truck back from Jefferson and its been completely gone through, they did Bulletproof and the whole front end. And just an amazing job andcpeople and workers there from front desk to mechanics. Its brand new now and it is every bit worth it its been done timely and proper so thank you guys soooo much very happy the truck is awesome!! read more

They did a great job for me and were ahead of schedule. Upgraded my job also with better/bigger parts and equipment. Reasonable prices for the job. Nice guys too. Highly recommend read more

Will definitely recommend to friends. Great work abs have helped me out of a bind a few times.

We are from out of town. We broke down in Redding during the wild fire. These guys were recommended to me. I called and told them we broke our flexplate. I was worried that it would be difficult to locate. They had it in stock and fixed my flexplate in a few hours. As they said. Theses guys know what they are talking about. Highly recommend for all diesel needs. read more

If you are not using Jefferson State Diesel for all your diesel repairs, you are making a huge mistake. I won't use anybody else. These people know what they are doing. They do their job right. Best place in town for diesel repairs. read more

The dreaded "check engine" light came on at the same time my truck developed a horrible sound in the engine compartment. My diesel driving friends directed me towards Jefferson State Diesel. An appointment was made, and my truck was dropped off. It was diagnosed with two separate issues, and repairs were made. My questions were answered thoroughly, and the cost of the repairs was quite reasonable. Their customer service is to be commended. My truck is back and running great! I highly recommend Jefferson State Diesel. They are now my go-to for my truck for any future issues. read more

I have a Diesel Truck and I generally take care of my own Service and Repair within my ability. Recently I was in need of help. I asked co-workers for a referral and everyone directed me to Jefferson State Diesel. I called the Shop and went to Voice mail. Within a reasonable amount of time I received a return call from a technician. We scheduled an appointment. I arrived to the Appointment. The person at the counter was friendly, knowledgeable and provided answers to all of my questions and concerns. The work was completed on schedule. Everything was done correctly. In addition the work that I had done was not specific to a Diesel Engine. So keep in mind that they provide service beyond Diesel Engine Repair/Service. I have other service that I will be needing help w/in the future. J.S.D. will be taking care of my Truck. read more

I have an older GMC diesel that had a vacuum pump siezing up. I stopped by Jefferson State Diesel as they were the closest shop. They jumped right on it, this was at 2:30. I figured I would have to leave it overnight but at 4:15 I got a call from them stating that my truck was done and ready to pick up! Outstanding service to say the least. If you drive a diesel I would highly recommend you give this shop a try!! read more

We just had an exhaust break put in by these guys. I have to say they are very professional, know their business and deliver on time. We used to have all our work done at the dealer but after our experience with Jefferson State we won't go anywhere else. read more

Absolutely the best place to take your diesel. the crew at JSD keeps my 97 12v cummins running amazing . I love my truck and I have JSD to thank . read more

These guys are the best. My truck died while idling in my back yard. I couldn't get it started again, I did some basic diagnostics and couldn't decide what the problem was and didn't want to spend two arms and a leg getting it repaired. I had taken the truck to Jefferson State Diesel once before, and they treated me right so when I finally decided to bite the bullet and take it to the shop that's where I took it. I called the shop first, This happened the end of October, I was told that they were booking appointments for December. I was also told that if I wasn't in a hurry, which I wasn't, I could have it towed to the shop and they would work on it when the could. So the the next morning made arrangements for the tow and got it over there. The guys at the desk got me checked right in (and it was during lunch break I was going to wait until they were done, but!). Anyway I explained I had some ideas of what the problem may be, well turns out I was wrong. About a week and a half later I got a call they had found several things wrong and explained what they were, I told them that I wanted the truck to be dependable when I got it back and not have to worry about it breaking down again anytime soon. So I had them take care of the problems they found and told them to investigate what could be a similar problem in the other fuel tank, good thing I did because that tank had the same problem. About a week later I got another call saying the truck was ready to go, wow and it was only the second week of November, this was awesome. I was given options for additional work, I approved part of it and decided against another, that I could take care of at a later date and save the Labor cost. I picked the truck up the next day. It not only runs but runs like new. I couldn't be more happy with not only the work but I felt the pricing was fair and honest. I can't say enough good about all the folks at Jefferson State Diesel, from the front office to the shop. They are all very professional and courteous. I highly recommend them to everyone. read more

If I could give them more than 5 I would. We were traveling with our 5th wheel to take the kids camping , when our truck started acting up. We literally had no idea what to do. Our trailer is so long we didn't know where to park, where to have the truck fixed. I looked online at Jefferson's ratings and I am usually pretty skeptical. But believe the reviews. I don't think we have met actual honest mechanics before, but we finally have now. We literally pulled into their parking lot with our trailer and they fit us in their very busy schedule. Realizing our situation, they stepped in and helped. Not only that but they really fixed it, not just said they fixed it and no extra bs about what else you need. We are forever grateful for them saving our camping trip and our beloved truck! A couple pluses, delicious mexican food next door and a super cool dog that will hang with you while you wait in the shop. read more

Jefferson State Diesel are experienced and great diesel mechanics. They give fantastic customer service and are thorough in their repairs. My Diesel truck broke down hauling a 5th wheel on vacation passing through Yreka, Ca. A shop in Yreka gouged me for $$$ looking for the problem, probably because they knew I was on vacation and desperate to get it fixed. I finally had it towed into Redding to Jefferson State Diesel. So glad I did. They are honest, reliable, and didn't charge me the full rate for things when they could have. Wish they had a shop where I live. Nice bunch of guys and enjoyed all their racing memorabilia in their shop. read more

Hi All! Once in awhile we come across a service that needs to be commended & recommended, one such business is Jefferson State Diesel on Hartnell in Redding. G.T. & I have both had service to our trucks here & let me tell you I would give them AAA rating plus. Their pricing is very competitive & more than likely less than anyone's, the quality of work is super, their friendliness exceptional, follow through way more than we're used to. I personally had an incident where my truck was serviced , when I got home I had a problem, called them (Jeremy) & he had one of his employees come out to our home (70 miles round trip) & fix the problem at no cost to us. Tell me any business that you go to that would back up their service like that. Janice & I will be bringing them for service not only our truck, but also our car in the future. They said that they would do just about any servicing & if they couldn't do so they would recommend someone else & back them up as well. Try them & tell them we recommended them to you, Gerry as well. Ken & Janice Burr, Shingletown, CA read more