Thedieseltechs Reviews 

My boyfriend ordered a bundle from The Diesel Techs that included a tune kit, exhaust kit, and EGR kit, and the entire experience has been nothing but frustrating. Multiple parts that were sent were incorrect, including the exhaust, and he ended up having to modify pretty much everything just to get it to fit properly. On top of receiving the wrong parts, the tune itself is terrible and definitely not the quality you would expect for the amount of money spent. When you order a complete bundle, you expect everything to fit and work together without having to spend extra time fixing issues that shouldn’t have been there in the first place. What should have been a straightforward installation turned into an unnecessary headache. Very disappointed with the quality and overall experience. Definitely would not recommend ordering from this company.

Customer support are very rude, treat you like your a moron. They can not explain anything properly or spell correctly so you can understand them.

Paid over $1k for an AutoAgent 3 programmer that cant even pull a file from their ExLynk cloud. Three days later, they're still giving me nothing but excuses and zero resolutions. I plan to file a complaint against them with my credit card company.

They sell good products but the tunes I got don't meet California EPA requirements. They can get a eo clearance from them but don't . I wasted $350 on the tune.
There customer service is horrible!!
The Web site should be redesigned saying off road use only right next to the tunes name and when you purchase it they still should warnin you.
I earned them just selling these tunes in California they could get a big fine.
I asked if they could just refund the tune file since it was illegal and misrepresented. They said no.
Don't buy from the!!

This company is a scam do not purchase! The customer service number they provide says no longer in service. The product isn’t what they advertise.

Garbage company. Bad customer service

The customer service and respect is terrible to their customers. If I could show pictures between sales people and their techs would explain everything in detail of how they treat their customers

Their website is trash, I was forced to buy a kit by a computer glitch. I contacted them right away to cancel the order and they said it was already shipped. That was Sunday morning. Then he wanted to charge me a 20% restocking fee. Buyer beware, do not these scammers.

I order a diet kit from another place I don’t want to say the name but I ordered it on January 15th 2026.The parts came fast however it was supposed to come with a tune and nothing it is now January 26th and radio silence no email response now nothing! I saw a Facebook post about using The Diesel Techs and it was a great choice!! The literally round the clock support is top tier. I order a ECM and TCM tune for an 08-10 6.4 power stroke, truck runs great tunes are great. I’m super happy with them.

Miserable to work with. Wish I new before I ordered. Im file every complaint that I can

Parts come late n missing parts n not they refuse to send me a shipping label to return it

The chevy delete pipe I bought for my 2015 LML does not fit at all. The hangers are in totally the wrong spot. I tried reaching out to them, but they do not provide any support. They don't answer their phone and I've left several messages without a single reply...

WARNING - DO NOT BUY. I ignored the scamadvisor.com website reviews and bought a tuner from this website since it was cheaper than others. I never got the tuner, and once I bought it, they stopped replying to my emails.