i have a 2012 ram 1500 hemi 4WD i took my truck in for an EVAP smoke test because i spent about a month straight myself trying to future it out and never could, i spoke to Aaron about everything what was planned out along with that i've had the same "service 4WD" light that has been turning on and off every bump i've hit for the last 4yrs i've had the truck - Martin ended up fixing the EVAP prob by finding a hose that wasn't connected and pulled way out of place, and fixed some electrical plugs on the 4WD transmission but the problem came back a few days later -also before i left the first day TMC ended up washing my truck which was cool the second time i dropped off the truck it was to replace the 4WD transmission actuator completely and it ended up fixing the problem completely, Martin ended up taking me to the back shop and we crawled underneath the truck and he showed me exactly what was going on under the truck and what he replaced everything was reasonably priced out i think, and on top of that Martin ended up teaching me first had a few things about my truck, i'll be coming back here again forsure read more

As a first-time customer, I brought my '79 El Camino to this shop because the car was idling high. After the service, I paid $500. They replaced my intake manifold gasket, BUT a P0200 engine code appeared afterward. I went back the next day and explained the issue. They told me they had left an injector unplugged and instructed me to clear the code, saying it would reset. The code was P0200, so I followed their instructions and cleared it. The code went away. The next day, I drove the car and it suddenly started shaking while sitting at red lights -- something it had never done in the five years I've owned this car. I checked the engine codes again, and P0200 had returned. I went back again and explained what I had experienced. They then told me that, in order to address the P0200 issue, they would first have to start by checking for vacuum leaks. This is where I became frustrated. P0200 is an injector circuit malfunction code, so I didn't understand why I was being told that I needed to start with vacuum leaks in order to address that specific code. I had already paid $500 for the initial service, and now I was dealing with a new engine code and a new shaking issue that the car had never had in the five years I've owned it. After declining any further service, I picked up my car from the shop. I then noticed a scratch along with a missing piece of rubber trim on my front bumper. I had not noticed either issue before bringing my car to the shop. The shop claimed they did not hit anything with the car, but they are also ordering me a replacement rubber piece. Overall, this was an extremely frustrating experience. As a first-time customer, I came in expecting to have my original issue addressed, paid $500 for the service, and left with a new engine code, a new shaking issue, and damage/missing trim that I had not noticed before bringing the car in. Based on my experience, I won't be returning. I would recommend that anyone considering this shop be aware of what happened to me and carefully inspect their vehicle before leaving the shop. Check pictures. read more

See all

This is a cool place to take your vehicle for repairs. The owner will work with you. Great guy. read more

Martin was very helpful and honest, after his first fix, it solved some but not all of the problems, so he had me bring it back and got it working perfectly. read more

I can't say enough great things about this body shop. My car had been down for almost a year, and they made the entire repair process as smooth and stress-free as possible. From the beginning, they kept me updated every step of the way, so I always knew what was happening with my vehicle. Their communication was excellent, the quality of the work was outstanding, and my car looks and drives great again. The team was professional, honest, and truly cared about getting the job done right. I highly recommend this shop to anyone looking for quality repairs and outstanding customer service. Thank you for everything you've done. I will gladly recommend your shop to anyone in need of quality repairs because you've truly earned my trust and appreciation. Thank you again for bringing my car back to life! read more

See all

Let me start off by saying if you are looking for a trustworthy and great auto shop TMC Repair in Walnut is the place. Dont go anywhere else. First off the lobby is so nice they even have snacks,drinks,water etc for its customers. Martin the owner is front and center in talking to his customers and getting the correct diagnostic done on your vehicle. I had a huge issue with my car and thought I would have to finally let my vehicle go, but it just meant so much to me I had to get it fixed. Not only did he fix it, its running like if it were brand new. This shop is diffrent from every other place because you can tell Martin cares about his customers and there cars, he treats you like family. I am so glad I really looked around for a shop and found TMC. Stop going to other places that dont care about customer service. 100 stars if I could rate it. Martin Thank You and your crew so much. read more

Highly recommend this place! I brought my Porsche in for an oil change and their prices were so reasonable. They also installed a new battery at a really good price. This place is honest and fair and they've found d a loyal customer! read more

2018 WRX "UPDATE"... After the leaking issues on the motor rebuild I brought the car back. Martin went above and beyond to fix multiple leaks that came about from the rebuild. I trusted Martin to fix everything and make things right. Martin will do whatever it takes to make this right and have a satisfied customer. I had to have patience and it paid off! The car feels and drives like how it used too! Martin's character to makes things right is why people should come to his shop. He will help out to the best of his abilities to make the customers satisfied. Thank you Martin!! read more

5 Stars - TMC Auto Repair in Diamond Bar (aka the place that actually gives a damn) Let me paint you a quick "before and after" picture so funny it hurts: Scene 1: Midas in Diamond Bar, 3:50 PM I roll up with a driver's window that's basically on permanent vacation (stuck halfway like it's trying to ghost me). The guy behind the counter doesn't even glance at the car. Doesn't ask a question. Just grunts, "Yeah, it's the motor." Me: "Cool, wanna pop the door panel and confirm? I'll pay for the diag, takes 10-15 minutes tops." Him: refuses to move, refuses to look, basically treats me like I'm trying to sell him oceanfront property in Arizona. I left wondering if "customer service" is now Latin for "get lost." Scene 2: TMC Auto Repair (literally two minutes away, same day) I used to go to this shop years ago when it had a different name. Now it's TMC and let me tell you -- it should be called TLC because that's exactly what they give you. Walked in frustrated and Martin greeted me like a human being who mattered. He listened to my Midas horror story, laughed with me (not at me), and said, "Let's actually look at it." One of his techs pulled the door panel in like 8 minutes and... drumroll... the motor was bad and there was a broken plastic piece in the regulator (exactly what I told Midas Guy, who apparently moonlights as a psychic but forgot to charge his crystal ball). They got the window temporarily working until the new part arrives, didn't overcharge me, and treated me like I've been their customer for a decade (because I basically have). Moral of the story: Midas Diamond Bar just lost a customer for life in under five minutes. TMC gained a customer for life in under five minutes. Martin and his crew are professional, honest, fast, and actually enjoy fixing cars instead of playing "guess the problem from the lobby." If you're anywhere near Diamond Bar/Walnut area and need work done by people who treat you like family (the good kind, not the dysfunctional Thanksgiving kind), go see these guys. 10/10, will be back the second that part shows up -- and for every oil change, brake job, and random rattle from now until my car retires. TMC, you have my undying loyalty... and my window now goes up AND down. Magic. Show less read more

Took my 72 nova down to TMC for some issues I was having with my motor. they were able to find and recreate the nosie to make sure they found the problem and fixed it . professional and detailed work would recommend for all your classic car needs read more

TMC Auto Repair - Auto Repair Near Me - Walnut, California

Took my K5 Blazer to Martin at TMC Auto--worst experience ever. He said it would take a couple days and convinced me he would have it ready for a car show i had planned; they kept it two weeks and then admitted they couldn't fix it. When I picked it up, it was filthy (branches, leaves, bird droppings) and had broken and missing parts in the engine compartment. Zero communication, zero professionalism and keep in mind I keep my vehicle indoors in my garage. I'll never trust this shop again. read more

TMC Auto Repair - This is my Blazer and here for reference in regards to the debri inside - Auto Repair Near Me - Walnut, California

In life, there are 'Argh!' moments that come your way, like when your car breaks down or you encounter engine trouble while driving. Family is out of town and you have no one there to help you. After contacting the towing company, I started searching for a shop to take my car to. I called several shops, and TMC Auto Repair was one of them. I have talked to Martin, who I think is the owner. He listened to my situation and showed sympathy for what I was going through. He was very accommodating, sent me the shop's location and detailed instructions on where to park my car and drop off the keys, especially since they were closed for New Year's. I truly appreciated how he answered my calls, even on holidays. Martin kept me updated with calls and texts once they started working on my car. He even expedited the replacement part, which had to be ordered and shipped from California. He understood that I still need to drive out of town. Labor and parts were priced accordingly. I was really happy on that day when he called up to let me know my car was ready for pick-up. Martin even waited for me beyond closing hours, as I was still waiting for my ride to the shop. While our interaction was business-related, I am sincerely grateful for the assistance Martin provided during my time of need. I must also mention that the towing guy was also nice. Glad to know there are still kind-hearted people in this world. This is what I call exceptional customer service. I have never regretted choosing TMC Auto Repair. read more

See all

They made it right. Much love to Martin who wouldn't give up. First time I went in they couldn't get it right, so they refunded me completely. Shocking honesty. I decided to give them another try since I felt they were really determined and cared. This time they were able to clear the dreaded Check Engine Light. My car now runs beautifully and I have just passed my smog check :) read more

It's on the expensive side, but customer service is great and good service. Worth the money.

Came in with my moms car to get a quote, after leaving the Car Martin gave me a call to explain everything that was going on with the car, explained what needed to be replaced and fixed to have the car up and running to get the car to optimal condition. Overall I'm pretty satisfied with the service they provided. I most definitely will come back and refer them with my friends and family. read more

I had an amazing experiences with getting my car service with Martin. Every time I came in the environment was professional and friendly. With each questions/concerns they were answer with such details to give me a better understanding. Finally troubleshooting was quick and concise. The repair of my catalytic converters went amazing and it's running smoothly! read more

My car got hit by another car when parked on the street, I was concerned about the transmission, so I called TMC Auto Repaid, Martin answered my call quickly and offered to check the transmission for free. I arrived the shop, was welcomed, and they took my car to test the transmission and even run the car through computer to see if there is any hidden issues. Really good and professional service. The repair studio is big and organized. read more

TMC Auto Repair - Inside - Auto Repair Near Me - Walnut, California

See all

I brought my car to Martin after buying a lemon and he was nothing but helpful and understanding. He did everything in his power to try to help me get my car fixed and worked with me in speaking with my insurance and was all around just a super nice human. I believe this shop to be reliable and truthful and will be sending all my friends here in the future. Thank you again Martin! read more

Both the owner and 2 mechanics treated both me and my car with respect and Professionally. I was a bit wary to see the young mechanics were in their late 20s yet the disposition and charming personality of the owner in his late 30s set me at ease. I own my 1990 VW Corrado G60 and brought it in to get my ignition timing correct. Lickity split after checking a few areas they started and finished the job in 20mins. It wasn't so much the speed but the Precision in handling my Baby VW. I've owned it for 16 years and NOW I will be bringing all my Mechanical auto repairs to TMC in Diamond bar despite the distance driving from Pasadena. Many other shops did not want the responsibility of Touching NY Baby! RTJ. VW CORRADO G60 read more

TMC Auto Repair - Racing German Flag stripes - Auto Repair Near Me - Walnut, California

Had suspension maintenance work done at a different shop and a month later a ball joint snaps and my tire just about came all the way off. Collision place didn't want to work on it because its an older truck (2002 Dodge Ram) and couldn't get parts. They told me to get the parts and after some time (lagging on my end) I finally get around to ordering the parts, but now they dont want to work on it because it's not original manufacturer parts. I search around online and come across TMC with great reviews. I need to have my truck towed asap and decide to stop by TMC on my way to have my truck towed. I talked to Martin, explained the issues and he says to bring it in!! Not only was TMC knowledgable about the issues at hand, they kept in touch and gave me updates throughout the day. My truck, which had been sitting at another shop for close to 2 years was completed in one day at TMC!!! They worked overtime the regular hours, which I appreciated, and even when I forgot some parts that I purchased that didn't fit, they called me the next day to pick them up. I paid close to a thousand for those 2 parts alone and really appreciate the honesty. When I drove my truck away about an hour past closing time, I could see the team cleaning up and getting ready to leave for the day. They were full of genuine laughter and smilies. Seeing their interaction in the time I was there, you can tell a good team when you see one. This makes all the difference. The truck drove great and after a lot of barriers and anxiety from other shops, TMC got to work and did an awesome job. This is a great shop and I can say that have now found my new mechanic. Highly recommended. Thank you Martin and Team!! read more

If you need a shop, this is the place to come. Very fair prices, always keeps you updated on your vehicle via texts, notes, or photos. Values your time and understanding that you need your vehicle. Technicians are very respectful and keeps the shop very clean. TMC works on anything and everything. Don't pass them up... they are the place to go in Walnut read more

Worked with Martin (owner) who was friendly and professional. My 2018 Jeep Wrangler needed a new radiator and Martin made the process easy by working with my schedule and ordering the necessary parts ahead of time. The installation took only a few hours, he avoided removing the AC which saved me in work hours and freon. I don't know what else Martin did but my Jeep runs like new. It's peppier and definitely runs cool. I highly recommend TMC, honest and affordable. read more

TMC Auto Repair - 2018 Jeep with new radiator from TMC on road trip to Oregon. Runs like a dream. - Auto Repair Near Me - Walnut, California

After 3 Macanics and more then $1000 on unnecessary parts that my truck didn't need!! I brought my 2008 Chevy Silverado to Martin not only did he fix the problem he did in less than one day I just want to thank Martin and his crew for the work they did on my truck!!!! read more

My 2015 Jeep Grand Cherokee overheated on my family while we were in town. Martin is all about service. We didn't know what the issue was, and he patiently answered all my questions. He keeps you informed with text messages, phone calls, and even a link to see photos and progress of you car. He even invited into the shop to show me the engine and the work that was being done. Martin was in a constant communication, and diagnosed the issue. He's not quick to push the expensive job, but instead outlines the options you have and talks through it with you. read more

Best new auto repair shop in the area. The work done on my wife's BMW was timely and Martin's communication via text was very convenient. The waiting area was spacious and nicely decorated. Definitely a "go to" spot for future repairs on my cars. read more

Excellent experience at TMC Auto Repair! Had replaced my broken suspension along with oil pan gasket and sway bar bushings with a very quick return time. TMC provides a detailed breakdown of everything via text along with really responsive communication and very reasonable value. Martin and Ysabelle were extremely helpful and accommodating with high quality work, will definitely be back for any auto repair needs read more

My Toyota Camry SE recently needed new front axles. Got them replaced same day for a great price. Travis and Martin were great to deal with. TMC recently moved to the back of the building from the old location. New waiting room is nice with tv, seating, and cold water. They also offer taxi ride home if needed. All parts have warranties. Car drives great! read more

5 Stars - TMC Auto Repair in Diamond Bar (aka the place that actually gives a damn) Let me paint you a quick "before and after" picture so funny it hurts: Scene 1: Midas in Diamond Bar, 3:50 PM I roll up with a driver's window that's basically on permanent vacation (stuck halfway like it's trying to ghost me). The guy behind the counter doesn't even glance at the car. Doesn't ask a question. Just grunts, "Yeah, it's the motor." Me: "Cool, wanna pop the door panel and confirm? I'll pay for the diag, takes 10-15 minutes tops." Him: refuses to move, refuses to look, basically treats me like I'm trying to sell him oceanfront property in Arizona. I left wondering if "customer service" is now Latin for "get lost." Scene 2: TMC Auto Repair (literally two minutes away, same day) I used to go to this shop years ago when it had a different name. Now it's TMC and let me tell you -- it should be called TLC because that's exactly what they give you. Walked in frustrated and Martin greeted me like a human being who mattered. He listened to my Midas horror story, laughed with me (not at me), and said, "Let's actually look at it." One of his techs pulled the door panel in like 8 minutes and... drumroll... the motor was bad and there was a broken plastic piece in the regulator (exactly what I told Midas Guy, who apparently moonlights as a psychic but forgot to charge his crystal ball). They got the window temporarily working until the new part arrives, didn't overcharge me, and treated me like I've been their customer for a decade (because I basically have). Moral of the story: Midas Diamond Bar just lost a customer for life in under five minutes. TMC gained a customer for life in under five minutes. Martin and his crew are professional, honest, fast, and actually enjoy fixing cars instead of playing "guess the problem from the lobby." If you're anywhere near Diamond Bar/Walnut area and need work done by people who treat you like family (the good kind, not the dysfunctional Thanksgiving kind), go see these guys. 10/10, will be back the second that part shows up -- and for every oil change, brake job, and random rattle from now until my car retires. TMC, you have my undying loyalty... and my window now goes up AND down. Magic. read more

When I called you about your alternator failed again last month, merely after 4 months. Your first reaction was 'Yes, we can replace it but there could be other electrical issues that we need to take a closer look, that could be the reason caused the alternators go out so easily.' You did not acknowledge the part quality that you installed was the problem, even though you know they are not the quality parts you provided, and that is why you are willing to provide the warranty because you know they are cheap junks, which fail often and could fail anytime. And once they failed, you would point out other things are actually the problem so you can do more repairs on those poor returning customers. Behind your charming appearance and smiles, that is the game that you are actually playing. I am not confused at all. From your reply, I am now giving you the lowest rating for the shenanigans that you are operating for your shop. I am very clear on this, and hope there is no confusion, or delusion on your side as well, thinking that you can still bribe me out of this disappointing experience to charm me over and bribe me back. Do better, Sir. read more

Great service and great prices. They are always fair and don't recommend unneeded services. I take all my cars to TMC.

Dealership found worn bearings and sway bar links during routine inspection for my wife's car, but quoted too much and had other unnecessary recommendations. Martin was very good in responding and was able to do the work the same day we communicated. Price was average, so not cheap but still much better than the dealership. No problems so far. Will update if anything changes. read more

Will take weeks with your vehicle, with a lot of runaround and excuses. Does not honor warranty work. Find a different mechanic/shop.

Martin is the Man. I got a blown head gasket on my 2018 jeep grand Cherokee and Martin was helpful and fixed my jeep. I really appreciate his honesty and service he will always have my business. Thanks alot Martin to you and your guys god bless you guys . Ran my jeep a week now n smooth ride like new. Plus he fixed my starter, my jeep starts fast now. Hope you guys never change the way you guys do business thanks read more

This auto repair shop is customer facing and honest. The shop owner understands the customer's need and provides excellent service and value. I highly recommend this auto shop to everyone and I will be a life long customer! read more

Martin is amazing. 10/10 service! He fixed my A/C quickly, explained everything clearly, and went above and beyond. Highly recommend TMC Auto Repair! read more

Our Lexus was diagnosed at the dealership, we received a quote for labor and TMC completed the job for a fraction of the cost. Thank you Martin. read more

Replaced a cvt transmission for a Nissan versa at the lowest price point and quickest turnaround of all the area including oc area. 4 months later and still no issues. They deserve a good review, so here it is. read more

I highly recommend TMC Auto Repair Shop! Martin is very accommodating in all our queries. The total amount we paid for parts and labor are reasonable. And the very happy part is they offer us a free ride going to our house because the repair will takes hours (via uber). They have free snacks and drinks too! If you want to stay and feel bored they have a table games to do, so no down time while waiting! I'm glad we found a trusted shop, and we will definitely be back for our future repairs. More power to TMC Auto Repair Shop!!! read more

See all

This was my first time at TMC. I came in for an A/C diagnosis and I was impressed with their experience. Martin clearly explained what was wrong and walked me through exactly what needed to be done to replace the evaporator core, step by step. Martin's communication was honest, detailed, and easy to understand. The work was completed quickly and professionally, and it's obvious these guys know what they're doing. Skilled, efficient, and straightforward. Highly recommended TMC if you want quality service done right. read more

very good customer service and excellent communication (you experience why). Def would continue service from Martin and his crew!!