I copied my case notes from over 200 cases I have worked as a Field Service Engineer at General Motors, (removing personal information) and pasted it into a single document.
I uploaded this document along with a transcript of my book, Hotwire Your Skills, to Claude AI.
I then asked Claude to analyze my case summaries and compare to my published diagnostic process -- to determine if I am subconsciously/unknowingly doing any additional diagnostic steps outside of what I am aware of.
I also asked it to give me an analyzed rating on how well I am following the process I preach. I also asked it for insights on the most common type of problems I handle.
The results shocked me.
First, it revealed 7 diagnostic steps I perform consistently across hundreds of cases that are not published in my book. Steps I didn't even realize I was doing until an AI read hundreds of my own case notes back to me.
The biggest one? "Like-Unit Comparison" — pulling an identical vehicle off the lot to compare behavior side-by-side. It showed up in the majority of my cases and is arguably my single most powerful diagnostic tool.
A few of the other unnamed steps it found:
— Pre-Visit Phone Triage: arriving with a diagnosis already partially formed
— Aftermarket Mod Screening: catching non-GM parts early
— Multi-Stakeholder Briefing: aligning the service manager, advisor, and tech as a team before touching the vehicle
— etc.
Second, it graded my framework execution. The good news: my concern verification and repair verification are strong — I consistently exceed what my book prescribes. The honest feedback: I sometimes start testing before I've written a formal game plan, and a few cases show component replacement happening on strong suspicion rather than confirmed root cause. Fair point.
Third — and this one genuinely surprised me — 29% of my entire caseload resolves as "vehicle operating as designed." No defect. No repair needed. Just a vehicle doing exactly what it was engineered to do, with a customer (or dealer) who didn't know that.
29%! That's nearly 1 out of every 3 vehicles I get involved with!
The AI identified specific phone triage questions that could catch most of these BEFORE I ever drive to the dealer.
Key takeaway for me: the knowledge was always there. It was buried in 200 case files, invisible because it was never named. Once it had a name, it became teachable.
Oh, and here's the best part:
I took it a step further -- and created a diagnostic process app called TorqueAI.
I'm almost finished with it, and when it's done I'll need some beta testers. If you're interested in trying it out, comment below or send me a DM!
What steps are YOU taking that you've never written down?