Glass Box Diagnostics | Transparent Vehicle Diagnostics

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Transparent, expert-level vehicle diagnostics without selling unnecessary repairs. We diagnose. We explain. You decide.

Honest work. Fair prices. Your call.

The Seasonal Checklist

A few short emails a year: what to check on your car before Hill Country summers, freeze nights and I-35 road trips. No coupons, no upsell blasts. Unsubscribe anytime.

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Services

Mobile Vehicle Diagnostics
Electrical Troubleshooting
ECU/PCM/TCM Programming
Module Coding & Configuration
CAN Bus & Network Diagnostics
Pre-Purchase Inspections

More Services

Repair Consultations
Remote Diagnostic Support
Fleet Services
ADAS Calibration
Specialized Diagnostics

Company

About Us
Our Mission
Our Team
Pricing
Savings Calculator
Keep or Sell?
Shop vs. Glass Box
What's in My Trunk
Honesty Quiz
Check Engine Code Decoder
Symptom Guide
Warning Lights
Is It Safe to Drive?
Car Won't Start? Tree
Free Recall Check
Free VIN Decoder
Used Car Checklist
Failed TX Inspection?
Driveway Leak Checker
Maintenance Guide
Blog

Support

Service Area
Trip Fee Checker
All Free Tools
Repair Quote Checker
Repair Cost Guide
FAQ
Site Search
Help Center
Contact Us
Technical Support

Platforms

Customer Portal
Technician Dashboard
Shop Portal
Fleet Management

Contact

21360 FM 306
Canyon Lake, TX 78133

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diagnostics@glassboxdiag.com

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TX Licensed & Insured

21360 FM 306, Canyon Lake

Factory-Trained Tools

OEM scan tools, CAN bus, ECU

Canyon Lake Local

Hill Country expertise since 2026

Zero-Upsell Guarantee

We diagnose — we don't sell

Same-Day Service

15 min avg. response time

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