I'd give these guys 10 stars if I could! I made one of the biggest mistakes a diesel owner can make and accidentally put DEF in my fuel tank. Matt and the crew at Smith Diesel Performance got me fixed up and back on the road in no time, and the bill was far more reasonable than I expected. In a day and age when it's easy to worry about being taken advantage of during a stressful situation, it's refreshing to find an honest, knowledgeable shop that truly takes care of its customers. If you're anywhere near Cedar City and need a friendly, experienced diesel mechanic, do yourself a favor and give Smith Diesel Performance a call. I can't recommend them highly enough! read more

I was pulling a fifth wheel and my truck started to over heating going up grade I pulled over call Smiths Diesel talked to Carlyle I told him what was going we were about 10miles from town he said they close at 5:30 but they would wait for me I was able to limp it into town drop the fifth wheel off at the RV park about a mile from the shop got it into the shop they had 3 mechanics jump on it trying to element quick fix's water pump thermostat fan etc this was Friday night they are closed on sat and sun so we waited until Monday morning blow head gasket and a couple other things I am sure they put me ahead of other trucks they got on it right away trying to get me back on the road Carlyle would txt me keeping me updated I thought that was awesome they had me back on the road Thursday morning they upgraded something replaced my def tank also it was even cheaper then they quoted me which I was thankful for everybody there was professional knowledgeable polite guys I really appreciate all they did for us they were awesome read more

The customer service is fantastic! Very knowledgeable, efficient, professional, and helpful team. The diagnostic abilities are quick and saved us money. They were able to fix our truck quickly, and have been very accommodating. I highly recommend them!! read more

I made an appointment on 8/18/25 For 8/27/25 at 8:00 am. Matt said to bring it in by 8:00 so they could diagnose the problem and that he would let me know by noon. I called at 11:30 to check since I hadn't heard from Matt to see if they had found anything, the guy I talked to said they were still working on it and said he would have Matt call me. I stopped by the shop at 1:00 to talk to Matt and my truck was still parked where I left it at 8:00 am. I talked with Matt and he said he was going in to find out when they would start on it and then he would call and let me know. I didn't hear from Matt so I stopped by at 2:30 and picked up my truck where it was still parked from the morning. Pretty disappointed, a phone call would have been nice. read more

Smith Diesel is an extremely well-run, thorough, and tidy diesel shop. I had the unfortunate event of towing through mountain passes with a 15k 5th wheel in my 2012 F-250 6.7 and (I thought) partially blowing my turbo. Upon limping to our campsite in Capitol Reef, and the local shop basically telling me to get lost, I phoned Smith Diesel. I walked them through what happened and my thoughts. It was Monday morning, my family was with me, and they said it would take all week to fix. Other shops didn't even return my call. I dropped it off at 11 AM on Monday. There were ~20 diesel trucks in the parking lot. All of their tickets were neatly lined up on the counter. The waiting room was absolutely spotless. The parking lot and landscaping - tidy. There is a lot of pride in ownership with this business. I love to see it. I received a call before 2 PM that day. The turbo was fine but my exhaust manifolds were leaking and the studs were shot (known issue with this year). While it was more expensive than a new turbo, the work would be quicker. Instead of Friday, it would be ready Wednesday. This was a huge save because we were running out of things to do in Capitol Reef with 2 little kids. Low and behold, I get a call at 4:30 PM on Tuesday and they tell me I'm ready to go (a day early!). We happened to be in Zion (with a rental) so we were able to grab it on the way back. They also mentioned they found a small leak in one of my fuel lines so they replaced that, too. In the following 48 hours, we made it all the way back to Austin. We never had a single issue. I'm incredibly thankful for the professionalism, speed, efficiency, and empathy the Smith Diesel Team showed. I cannot recommend them highly enough. read more

Smith Diesel Performance & Repair - Auto Repair Near Me - Cedar City, Utah

Hats off to the crew at Smith Diesel! My truck broke down just outside of town and they got me back on the road! There's nothing worse than truck problems on day one of a road trip! Only one day lost due to the issues. These guys work hard. The charges are fair. Thanks Soooo Much ! read more

Smith Diesel Performance & Repair - Auto Repair Near Me - Cedar City, Utah

Carlyle was so helpful at the front counter and the owner went out of his way to help us. They were able to diagnose the problem, fix it and get us on our way. If it wasn't for Smith Diesel Performance we would have cancelled our vacation! Thank you so much for the amazing service and expertise you provided us! If you're looking for a highly respectable diesel mechanic... Smith Diesel Performance is definitely the place to go! read more

Took my 03 6.0 F-250 to diagnose an oil leak Service writer Matt said the engine needed to be pulled for bedplate reseal along with rocker boxes and oil pan. Specifically said that the rocker boxes were the major source of the leak. $9,600 estimate. I declined of course. When I picked up the truck the write-up indicated that the front cover was the major source of the leak, not the rocker boxes. The front cover gasket is on a few hour job nowhere near $9,600. I replaced the front cover gasket and the leak is fixed. It did not need the recommended $9,600 work. Buyer beware. read more

After our 6.6 Duramax on our 2009 GMC pickup threw a code for low rail pressure for the 3rd time in two days and after changing the fuel filter each time and still going into limp mode we realized it was not bad fuel (pickup was pulling 5th wheel). Smith's was recommended so we called on a Thursday afternoon, they said to bring it right over. We found an RV park to drop the camper and got the pickup to them that afternoon. They looked at it right away even though their lot was full. And then had us come back Friday morning so they could finish running codes. Turns out the fuel injectors were shot. Fortunately they had a full set in stock . I still can't believe they finished up by the end of the work day on Friday and we were back on the road first thing Saturday morning. Kyle, Skyler and Joe were unbelievably knowledgeable, courteous, and prompt. They definitely check all the boxes. I still can't say enough about how amazing we were treated. We all know how stressful breaking down on the road is but if you are ever near Cedar City Utah call Smith's they are the best!!! read more

Seriously love this place when it comes to getting my trucks serviced. They're hard working, honest and truly excel at what they do. Device like this is very hard to come by in the diesel industry here in Utah, but Smith diesel is the best through and through. I would NEVER take my trucks anywhere else. I travel all the way from salt lake to cedar because I wouldn't trust anyone else working on it. They're straight to the point when it comes to diagnosing your vehicle and will give you different options and price points as to what will make your vehicle run like a beast they honestly need to change the name to The Best, cause that's what they are! These guys are the real deal when it comes to diesel. They'll never lead you astray. Keep up the amazing work ! read more

Couldn't be happier with Matt and the entire crew at Smith Diesel Performance. My 2020 RAM 3500 HO Dually didn't need repairs. I had aftermarket equipment I needed installed as the truck won't fit in my garage. They were happy to accomodate me and had it all installed correctly and on time for me. Their pricing was fair and most importantly they treated my truck with respect. I will be returning for all of my future maintenance and repairs! read more

Was on vacation and they fixed radiator and was happy then few days later my 06 powerstroke was running hot. Took it back in to another great shop in vegas and they said wire for fan clutch was ripped from fan and did someone recently work on it. Smith diesel when putting in radiator bumped wire or didnt put wire 100 percent secure because days later wired got chopped into fan. Smith diesel said they secured it but how then did it get chopped up in fan blade. That means it wasnt all the way secure. I called to see if they can help out with money towards new fan clutch but insult just offered $100. New world we live in. read more

Smith Diesel Performance is excellent! We had a gremlin wiring issue in our camper that kept leaving us stranded and a slew of mechanics in 3 different states couldn't find or fix it. We were lucky to get an appointment with Smith and Ladd's towing (also excellent) got us there quickly and easily. Kyle (a wiring super-genius) found and fixed it right away and charged a fair price. Highly recommended. read more

Smith Diesel Performance & Repair - Auto Repair Near Me - Cedar City, Utah

The guys at Smith Diesel Performance are awesome! Their lobby and shop are immaculate, with everything from the chairs and couches to a well stocked complimentary beverage and snack area geared towards the care and comfort of the customer. What a refreshing concept! The guys behind the counter are also awesome, and they go out of their way to explain all the details on what they perform and what their diagnosis is. Can't thank Kyle, one of the co-owners, enough for doing everything possible to get my wife and I back on the road, as I explained to him that we were on vacation, celebrating her recent birthday and retirement. All in all, I highly recommend a visit to them if you experience issues on your diesel truck. They are experts on all makes and models, and you will be in great hands. As a side note, many of the nice people we met in Brian Head also gave them high marks when they found out we took our truck there. read more

I've taken my diesel GMC Sierra 2500HD into Smith Diesel on several occasions. I've always found Kyle to be honest and trustworthy when it comes to doing repairs and servicing. I only wish there were more auto shops with as high standards. He has done diesel injector swaps, oil changes and glow plug swaps and always at fair pricing. I'm happy to know Kyle and his team as they do good work. If you need diesel engine truck servicing Smith Diesel is a very good shop.. read more

Living in Vegas is hard to find a good & honest repair shop when it comes to owning a 2006 5.9 Cummins. My baby wasn't feeling right at idle & my 48re tranny finally gave out on me. I decided to be patient & had my AAA auto club tow it to the professionals in Cedar City based on their reputation. I'm so happy that I made that decision. They first diagnosed the idle problem & discovered that the 3rd fuel injector was bad. Then next was the tranny. I already knew that I was just going to have it rebuilt so that I can later add a programmer to open my baby up to 500 HP. Four weeks later I went to pick up my truck & all I can say is WOW!!! Kyle & Joe have my business for as long as I'm still breathing. These folks are totally honest, fair, & profesional. No one is perfect but its all about trying to be the best that you can when being trusted by others. Thank you Smith Diesel Perfomance. read more

I am a Las Vegas local and I didn't trust or wanna give any of the local shops my time or money, I called Smith Diesel Performance and the staff were extremely friendly and knowledgeable about the work I wanted done. I drove up and dropped my truck off late on a Friday and by Monday morning they had my truck squared away and ready to go ! Absolutely the ONLY shop I'll take my diesels too and there quality of work is outstanding ! There pricing is even better, if I could give more than 5 starts I would. Keep up the outstanding work. read more

Can't thank the folks at Smith Diesel enough for helping us out. During a cross-country drive pulling our travel trailer, we realized our Ford F-250 needed an oil change and a fuel filter change. We were spending the night in Cedar City, and Kyle and his crew were able to get us in less than an hour before closing that day! Very fair prices and a quick turnaround. Thanks for making our trip easier and being so accommodating, we really appreciate it! read more

We were stranded in Cedar City with our 2008 Chevrolet Silverado HD diesel truck and our RV. The check engine light came on and we were unable to go faster than 30 mph. Kyle was very helpful in diagnosing and fixing the problem and we were on our way the next day. The cost was very reasonable, as well. read more

We had our Ram 3500 towed from Bryce Canyon with clutch issues, and this shop not only had an upgrade clutch/flywheel kit in stock; they had it installed same day! Can't thank this team enough for having us back on the road quickly and professionally. As a former journeyman & ASE mechanic, I'm impressed and grateful for their work. If I was still turning a wrench, I'd want to work here. read more

I was in Brianhead and needed my heating element hooked up to the wiring harness. Told them what was going on and they got me in immediately! I was amazed and very thankful that they got me taken care of so quick! And it was only $50 bucks! Thanks for taking care of me fellas! read more

TERRIBLE EXPERIENCE!! Go to a diesel shop in St. George or rolling rubber here in cedar and save yourself tons of money and time. I Had my truck in there for a few simple fixes. Had an oil leak on my HPOP and a parking brake that needed a new cable and my fuel psi was dropping when I was low on diesel fuel. They would tell me a date to bring it in and I'd get a ride so I could drop it off and they would tell me I can't bring it in today because they don't have room or time. (I set up a date with them over a month before.) okay same thing happened the next time. And the next time. I should have known then to go somewhere else. After I got it in And had them work on it I had to bring it back in multiple times because it never stopped leaking oil from the HPOP (literally pouring out oil), the brake still isn't holding the truck in place, and my PSI was now maxed out at 120 PSI! They told me they don't know how to work on fuel regulators so they don't know how to fix the PSI and make it go back down to a normal range. And told me I needed to figure it out on my own. After they messed it up. They left rags and starting fluid in my engine bay. Oil was EVERYWHERE all over the motor. The last time I brought it in they stripped a bolt on my HPOP (that I just payed 900$ to have done) and they told me it needs to be towed and said they aren't going to fix it and I could "find another shop your keys will be in it and it I'll be out front." I couldn't believe how disrespectful Kyle is. I've never been treated worse by a company in my entire life. I drive my truck into the shop and have to tow it home because it's completely un drivable. WHAT!?? The Parking brake still doesn't work. Psi is still maxed. I paid over 2k to have more issues then I originally had.. Makes me so frustrated they don't have any competition in cedar so they think they can treat people like crap and get away with anything and they will still get business I can't believe it I truly can't. !!DONT GO TO SMITH DIESEL!! read more

Great service. Very helpful. Took care of us when we needed it most. Kyle and his team are on point.

This place is clean and professional. The lounge has AC, free bags of chips and packages of M&M's and other chocolates for their guests. The interior reminds of a new auto dealer waiting area. I made an emergency stop here to have my Sprinter serviced. The check engine light came on and the van was loosing acceleration power. I could only top off at 65 mph. Feeling uncomfortable to continue driving 7.5 hours to get home I decided to get the van checked out. After a little waiting they found the problem was the fuel filter being clogged. Got my van back on the road and we headed home. Kyle did a great job. Solid service! read more

We were traveling from CA and had an RV spot in Cedar city UT, we stopped for a fill up before checking in, and my husband heard a "noise" from the engine of our 2004 Dodge 2500. We called Smith Diesel and they were able to see us THAT day. They diagnosed a bad water pump, plus they found we needed new brake pads and our wheel bearing on the driver side was going out. Kyle called us multiple times keeping us updated on our truck. We had excellent service and couldn't of been happier with all of the needed repairs. A big diesel shout out to Smith Diesel performance, thank you for keeping us on the road. read more

These Guys get it done.. I have a General Auto Repair Shop in town.. and I take my own Diesel there for repairs.. They do a Great job at a great price. Thanks again Smith Diesel for taking care of customers that I Send to you and also taking care of My Truck. read more

Our truck bogged down while pulling our toy hauler on the first day of a two-week trip. Yelp had great reviews for Smith Diesel, so we limped in there at 20 mph. Even tho it was near closing time, they made time to find and fix the problem. Forever grateful!! read more

Wonderful service and staff! We broke down on the interstate headed to Wyoming. They did everything to get back on the road again. If I lived in the area they would be the only place I would go. I highly recommend them. We have drove 200 miles and haven't had one problem! Awesome people and work! read more

On September 10th me and my wife were headed home when the truck lost power around 10:00AM, I had it towed in and the tow truck driver recommended Smith Diesel, so we went there and they found out the high pressure oil pump went out. Thinking it won't be fixed today because by now it was around 2:00PM, they told me they can have it done by 6:00, they had it done by 5:00, got back on the road and made it home that night. "Thanks Smith Diesel you are awesome" wish you were here in Southern California. read more

First I want to say Smith Diesel are the only people I will let work on my truck. I can always count on them when I'm looking to have something done to my Dodge truck. Everyone is always professional & knowledgeable. If your looking to have work done on your vehicle I highly recommend them. read more