Diagnostics and Electrical Repair in Phoenix, AZ
If your truck won’t start or the lights are flickering, it’s time for a proper diagnostic. At Complete HTR, we specialize in diagnostics and electrical repair for heavy-duty trucks, trailers, fleets, RVs, buses, and heavy equipment. Whether it’s a failing alternator, battery, or sensor, we find the fault and fix it the right way.
We service:
- Alternators, starters, and batteries
- Wiring harnesses, connectors, and relays
- ECMs, sensors, and fuse boxes
- Dash warning lights and fault code diagnostics
- Lighting systems and power distribution issues
With advanced diagnostic software and skilled techs, we eliminate the guesswork and make sure your truck runs like it should.
Why Choose Us?
Electrical problems can leave you guessing and grounded. At Complete HTR, we get to the root of the issue fast—no unnecessary parts swaps, no wasted time.
- Full-service in-shop diagnostics for all major truck systems
- Repair and replacement of batteries, alternators, starters, and modules
- ECM and fault code diagnostics with industry-leading tools
- Mobile electrical diagnostics and repair available within 50 miles
- Coffee and comfortable lounge area while we work on your rig
- Pick-up and drop-off services available for added convenience
From quick wiring fixes to in-depth electrical troubleshooting, we’re ready to get your truck powered up and back to work.
Mobile Services and Roadside Assistance Within 50 Miles
Complete HTR offers mobile electrical repair and diagnostics within 50 miles of Phoenix, AZ. If your truck won’t start or you're dealing with an electrical fault at your yard or jobsite, we’ll bring the tools and tech to your location for fast, accurate service.
Schedule Your Electrical Repair Now: Call 623-745-5896!
If your truck won’t power up or you're seeing warning lights, don’t wait. Call 623-745-5896 now to schedule electrical diagnostics and repair with Complete HTR.
FAQs
What Areas Do You Serve?
We are located at 2450 S 7th Street Phoenix, AZ 85034 off the I-17 and 7th Street. We also proudly serve the greater Phoenix area, including Tempe, Glendale, Mesa, Scottsdale, Chandler, and more.
What Do Diagnostics Do?
Diagnostics identify the cause of warning lights, no-start issues, poor performance, or electrical malfunctions. Our tools scan your truck’s systems and provide accurate fault codes to guide repairs.
What Are Common Signs of an Electrical Problem?
Dead batteries, flickering lights, hard starts, blown fuses, or warning lights are all common symptoms. Ignoring them can lead to breakdowns or component failure.
How Can I Get in Touch?
Call 623-745-5896. We’ll book your diagnostic service—either in our Phoenix shop or on-site if you’re within 50 miles.
Don't Take our word for it.
Read Customer Testimonials.
"Great reliable truck repair and mobile work. Ivan and Adrain great service guys."
"Amazing customer service, fair pricing and quick in and out. Called first, made a same day appointment, was out in about 5 hours. I definitely recommend them for the truck driver in need of service."
"Had DEF pump replaced on one of our Freightliner Cascadias. Service was fast, friendly and very economical. Will recommend to others. Small but Great place who will treat you right!"
Contact Us
Let us know what is going on with your vehicle, and we will get back to you soon with a quote.