I am so happy with my experience here. Both Don and Anthony helped me get my truck quickly fixed so I could be safe on a trip out of state. I'm fairly new to the area and I'm grateful to have found a place I can continue to go to with my trucks. Thank you so much! read more

75 YEARS in business. Their great customer service is one reason why. They do more than just injection service -- they do our oil changes, and today they replaced a damaged hose in the cooling system. They have a courtesy shuttle car to take you home/pick you up if needed. I carry a few of their cards with me, so that I can give them out. Great group and highly recommended. read more

Anthony and Donavon saved my 1982 Volkswagen Westfallia Vanagon turbo diesel! Today I enjoy taking her on trips and over night camping, because they diagnosed her problem and got her back up and running! They rebuilt the injection pump, after the turbo had been rebuilt by their friends shop. She runs amazing! Diesel Injection from the front desk to the whole shop is so courteous, conscious of your needs and extremely affordable! The best part, they are so honest and their integrity is intact at all times! Five star operation~ Sue O'Brien read more

Amazing! Best team in the business. Drew and the crew always take great care of us. Everyone I recommend them to has had the same experience. read more

Donavan and the techs are top notch brought the truck in for an exhaust leak and got right on it to diagnose the problem as I waited took a day for parts truck was ready in two days he even treated me to lunch o yea forgot he even took me to the truck rental about 10 miles up the freeway that type of customer service is rare now he gained a new customer can't go wrong well knowledgeable techs when it comes to diesel trucks read more

Wow ! Truck running great. This business has been around at least a half century They know their business, and it shows. A bit on the expensive side, but you get what you pay for. It's fixed, right and done in a timely manner read more

I recently went down to Fontana for the Nascar race. My truck broke down while I was there so I went in and spoke with the owner Donovan Marshall to see if he could help me. Donovan reassured me that he and his professional and qualified staff could help me and fix my truck in a timely manner. I am so grateful for all of the help from the Front office staff, the mechanics and from Donovan. I cannot thank them enough for helping me get my truck fixed so I could get back home safely. Sincerely, Mark Hahn read more

Donovan at Diesel Injection Service is super helpful! Very impressed by the professionalism and service work that was done.

The is company and it's people are top notch. They are the best in there field and if your looking for diesel professional look no further. I'm a new diesel owner and there willing to share there knowledge with me is priceless. Thank you to the entire crew and the front line Manager Anthony Marshall for the truck inspection . Also, Thanks for upgrade power you added with the 4" banks exhaust and banks tuner. You are the diesel specialist I trust for my work for life. read more

Diesel Injection Service - 2002 GMC 2500 HD Diesel 6.6 Duramax. - Auto Repair Near Me - Fontana, California

Donovan at diesel injector epair shop is honest. I will use them again because everything that he promised, he did. That is a quality that is hard to find in any business nowadays. Based on my experience, I will gladly refer diesel injector service to anyone and I will continue to go back-and-forth to them and give them my business. read more

The guys here really know Diesel engines. Straight up tells you what's going on and recommends at times you come look at what they found. They give you options on repairs per your wallet. read more

Great service! Anthony and Donovan and their staff are top notch. They go above and beyond your typical service. If you need injector work done on your diesel this is the place to go. My 03' Duramax runs better than new. Thank you Guys for such great work, greatly appreciated. read more

Admittedly, I was a little concerned from reading the negative reviews, but this place came highly recommended from a friend that works at a local GM dealership. I couldn't be happier! First of all, GREAT customer service from all the staff, but Donavon was outstanding! He spent nearly 20 mins on the phone with me before I even brought my truck in explaining what he thought maybe the problem and what they offered and why. I ended up have all 8 injectors replaced, 2 glow plugs, oil change, 2 new thermostats, fuel filter housing rebuilt and new fuel filter for LESS than a friend got quotes 4 weeks earlier at another location for just 8 identical injectors. I waited several weeks to see how the truck faired before leaving a review, knowing that I had to pull 1,000+ miles over mountains within a week or two of repair. Absolutely not the same truck! Pulled 16K 5th wheel like it was brand new! Over 3 passes 8,000 ft above sea level and 3-4 over 7,000. No sweat. I highly recommend their service and repair. I am telling everyone I know with the same symptoms to see these people. NOTE: Repair done on '07 Duramax Low Fuel Rail Pressure code. Glow Plugs 2 & 8 bad. Technician stated it was likely the controller, but wouldn't know until plugs were replaced. It ended up being controlled. read more

This place is over the top, honest, fair, polite, urgent and keeps you coming back! I won't take my truck anywhere else! Even a great place for parts! Special thank you to Donovan, Drew and John! Thanks for keeping our family on the road safe! read more

Update to my earlier review: I was preparing for the Sierra trip I mentioned when I noticed a spot of coolant under the truck. I called Donavan and he told me to bring it in and he would check it out. I figured it was something related to the hose that they had fixed, which they didn't charge me for and his tech probably spent 2 hours on it. It turned out that my water pump was starting to leak, not bad yet and there was absolutely no pressure to replace it, but being the good guy that he is, Donavan ordered the parts and got it done for me as quickly as he could to ensure that I could take my trip to the Sierras without the threat of losing my cooling system 300 miles away from home. I got back this weekend from the Sierras and the truck ran amazing! It pulled up the grades without breaking a sweat and ran nice and cool like it was suppose to and I was pulling through 100 degree weather. Like I said before, Diesel Injection Service is the only shop that will wrench on this truck from now on. read more

I gave them four stars because they had the truck two weeks but other than that the service was amazing . The guy was great who looked at my sons truck and was patient and etc . They fixed the issue I didn't feel overcharged . read more

Great place to get quality injectors and diesel products. The new location is very professional and looks amazing.

Since , I deal with Diesel for Work, as a Well known Vendor ... With a relationship built our Time....I do bring my personal Family Car " Toyota , Prius" . After Market , don't Want work on "most of the time". My college Students bring there vehicles as well. We are happy, Still .....1 plus Years. read more

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I would just like to compliment Diesel Injection Service for incredible customer service. Anthony went way beyond the call with follow through care to help resolve my problem. Both Anthony and DES get a rating from me. Thanks so much. read more

Can't say enough good things about Diesel Injection Service in Colton, California. Anthony and Donovan bent over backwards to help us out. We were literally stuck on the side of the road and 400 miles from home. They squeezed us in, made the repair, stayed late, and got us back on the road. Awesome customer service !! read more

They were so much great help. Went over and beyond to help me. Great customer service. Donovan you are the best. Thank you thank you very much read more

Love this shop! finally a place that knows there business. Experience and customer service is A+ My fuel system is running great! I will certainly recommend Diesel Injection Services to anyone. I will be back! read more

They people is friendly, every time i had Question about Car or part, They explained to me. Allso the place Look clean..

Excellent service! They fixed the problem I had and suggested service that would improve my trucks performance,which I plan on having done at a future date.. read more

These guys are awesome!! I've been here twice and always left with a smile. They are super knowledgeable and honest. The first diagnosis was spot on and gave me peace of mind, but it included a warning that there was a strong possibility that one or more of my injectors was returning too much fuel causing my truck to go into limp mode from low fuel rail pressure while under heavy load. I finally pulled the trigger on having them pull and test the injectors. Testing confirmed the initial diagnosis so they installed new injectors and fixed a leaking coolant line to the turbo which again gives me peace of mind that I am good to tow my trailer to the Sierras without worrying about failures. I have every confidence in recommending them to any diesel owner that needs top notch mechanical work done by honest people that won't take advantage like so many diesel shops do. They will take the time to explain things in such a way that you will feel comfortable making an educated decision. This is the only shop that will ever see my truck for any mechanical issues! I wish I could give them 10 stars!!! read more

I have taken my truck here a few times. There was a issue during my first time here with a glow plug snapping and falling into the head. They owned up to it and covered the cost for pulling the head and getting it resurfaced. Since then I have been back for Injectors, Fuel system and most recent turbo upgrade. They do quality work in a timely manner. Donovan is quite simply the best when it comes to quotes and getting jobs done. read more

The establishment has twice as many service writers as they do actual certified mechanics. Their diagnostics leave something to be desired. If anything other than injector service needs to be done, go elsewhere...save 50% by not having un-needed at inflatedprices. read more

I have a 01 Ford F-250 7.3 liter which had an annoying oil leak. I took my truck in to other mechanics and spent a lot of money trying to get it fixed with no luck. It was very frustrating for me. This shop was recommended to me by a neighbor friend. I dropped my truck off and spoke with Anthony and Donovan and explained my situation. I received a phone call about a week later from Donovan explaining to me that there were several places that the truck was leaking oil. Rear main seal, oil pan, turbo pedestal. Also had an exhaust leak from up pipes. I had them repair all of these things. My hats off to the mechanic Carlos who worked relentlessly on solving all these problems. The communication I received from Donovan and Anthony was great. The price I was charged for all work done was more than reasonable. I have had my truck now for over two months and no more leaks. I would bring my vehicles back to this shop and would recommend their services to anyone looking for an honest, ethical and knowledgeable shop. Thanks again Diesel Injection read more

Hands down, THE BEST customer service around. These guys have been helping me troubleshoot my first gen 12 valve fuel delivery issues and I couldn't have done it without them! I came across these guys and this shop when my truck began to hard start when hot. After going through the truck and replacing the obvious culprits and still no cure I searched for a shop willing to assist me. No shop anywhere near me would even touch my ole girl because it's a mechanical truck. Not only was Diesel Injection Service more than happy to dig in to this on going project, but was confident in their knowledge and skills to get me back on the road! Their Pump Shop and Service Department are top notch!! I cannot thank Donovan, Drew, Anthony, and any other technicians that have had a hand on my truck enough! Needless to say I have found my diesel shop! If you have a diesel truck and aren't bringing it to Diesel Injection Service, you're wasting your time and money. Enough said. Stop thinking and bring in your rig to this talented group of guys, you won't regret it! read more

This place is an excellent place to get work done. I had my truck here and it had to stay overnight. They have a security guard on site 24 hours and lock rod iron gate. They took care of the problem for a low price. Also, happy to get my oil changes done here. They are quick and have excellent customer service. They tell you the truth and constantly keep good communication with you in regards to your truck and informing you of changes that are needed before doing anything. I put gasoline in a diesel engine and they were able to diagnose it quickly and allowed me to tow it there with no problems. They didn't lie to me and try to sell me other things I needed to do to drain the gas out. They were on point here. They took care of this girl and I am one happy customer. read more

Took my father's 03 Silverado Duramax diesel in to rebuild all 8 injectors. Also sold us on a FASS Lift pump too. They originally gave us a 4 day turn around time (dropped off a 8am Monday). It ended up taking 7 business days (picked up the next Wednesday). They did give us a nice discount to compensate. It's now been 3 years and just under 60k miles and injector 4 is failing and truck is smoking again. Injectors should have lasted at least 150k miles. Spent over $4000 with that company and now we need to spend money to get the injector rebuilt again. read more

We are really glad that we find this service! They did excellent job on our truck. And everybody were very pleasant. In future we will go there again for sure. read more

These guys are awesome! Have been going there for years. Customer service is fantastic. They do outstanding work. Donovan is the man! I have had my 6.0 Diesel for 13 years and will only bring it to these guys. read more

Stay AWAY!! SERIOUSLY, DO NOT GO TO THIS PLACE UNLESS YOU ENJOY BEING RIPPED OFF. THIS COMPANY KEEPS RIPPING FOLKS OFF BECAUSE THEY FIGURE PEOPLE WILL ALWAYS COME TO THEM... DON'T!! You know, most people take a chance and go see for themselves what a company can do... Unfortunately I ignored the bad reviews and went there anyway just to find out this place is the most nightmare of any mechanic nightmare. They have no ethics what so ever and will purposely damage your engine badly to force you to spend money there. I brought my GMC 6.5 Turbo in to them because an employee said it died on him three times at a light. It ran perfect other than that. I took it to these people and after a week and a half of me calling everyday they finally said they could not duplicate the problem. Nobody who answers the phone knows anything, they put you on hold for 20 minutes to come back and tell you they still know nothing.. After a week and a half they told me to come pick it up that they reset the codes and wanted my guy to drive it to see if they come back. Now mind you, all the truck did was die at a light on occasion.... When I sent my employee to pick it up he called the office within minutes to tell me that the truck was running so bad that it scared him... It was running away him, shaking very badly and spewing fuel out of a fuel line onto the manifold. I called the shop and of course they said they didn't touch anything.. What they did do was the worst thing you can do to a Diesel Engine, intentionally run out a 1/4 tank of gas, which they knew would destroy the pump and they get to make money. Then they told my employee it was perfectly OK to drive away, thus insuring the total destruction of the pump, new filter and PMD. After a week of round and round and them ignoring me they finally told me they were not going to offer me anything other than a higher price for a repair that I did not need when they first got the truck. They quoted me $2300 for the pump, filter and installation.. I had the work Performed by a very reputable company right off Est in San Bernardino for $1350.00. And that was for more work than this rip company was going to do.. IF YOU EVER LISTEN TO ONE REVIEW, LET THIS BE THE ONE!! read more

Just had my diesel motorhome serviced today (oil changed and a leak fixed) and generator serviced. Excellent service, great facility and most importantly fair prices. I was unaware until recently that they did RV service. This is definitely my new go to place to take my motorhome. Glad I came across them. read more

Went to get my tires done, everyone was super nice and the mechanics that worked on my truck were very good at letting me know how it was going and how much longer it was going to take. Not only they did my tires, but they also checked out a problem I told them about for free! Also while I was waiting i was able to sit down and watch a movie on their Apple TV. Now that was good service. I would definitely recommend you going here to get anything done! Great People. Great Place. Great Service. read more

If you are looking for a company that can rebuilt your diesel fuel pump, look no further. I brought my 1989 Hercules engine pump here at Diesel Injection and I got to meet Tom, the technician. I was a little concerned that my pump could be rebuilt back to new condition. When I dropped it off to Danny at the front counter I was told that if there were any issues with the pump I would be contacted. I was contacted by the technician (Tom) but only to ask about the issues that I was having with my pump. Needless to say the unit was rebuilt back to original condition and the rest is history. Thank You Diesel Injection read more

i have to give the guys at diesel injection service big props they know what they r doing and if u need help they r there. donovan is supper good guy he knows his stuff and dose a great job of explaining the problems and the best way to deal with them. i have a ford pos 6.0 he helped me bulletproof the pos and has helped along the way to provide insight on other aspects of my 6.0 thanks guys u rock read more

Ok well here is the truth about how this place . I go here all the time when I have a question or need a repair. They stand buy there work and I had a small issue with a leaky fuel return line and they fixed it for free and the Tech came out and told me what was wrong with it and what they did to fix it. I have tried many diesel shops and tried to find a good awnest shop. And these guys buy far are the cheapest out there. Other shops charge 120 to 180 an hr for labor only now keep in mind the dealers are at 180 an hr. I my self am a heavy equipment mechanic I know what these guys are saying and what the parts cost my self. I'll bring my parts to these guys and they will put them on , no warranty of corse but it's ok with me. If you believe one bad review your stupid the fact is that there mechanics are ASE certified and know they can't hand those out. Have to go to a facility to acquire that certification. It's better to pay a little extra money for repair by someone who knows what they're doing then to underpay for bad work no warrantee inferior parts especially for a diesel. These guys are second-best to a dealership if not better. So if you think you're getting ripped off go do your research call different shops checked her hourly rate see their work and you will see you at diesel injection knows what they're doing and they have the latest Technology in pump and injection rebuilding. They come highly recommended from me read more