Field notes
Blog
Field notes on diesel diagnostics, RV systems, and what we're seeing on the road.
Apr 12, 2026 · Diesel
Reading SPN/FMI codes on a Cummins ISX without a dealer scan tool
When a check engine light pops, the OEM scan tool isn't always within reach. Here's how we triage in the field with a J1939 reader.
Read moreMar 28, 2026 · RV
PEX leaks at fittings: why they happen, how we fix them right
Crimp vs. expansion vs. push-fit — the three families behave very differently when an RV gets shaken on washboard road.
Read moreMar 14, 2026 · RV
Slide-out alignment: the 60-second test that saves a $2,000 repair
A misaligned slide tears its own seal apart over a season. Here's the eyeball check we run on every visit.
Read moreFeb 22, 2026 · Diesel
DPF regen problems on the Powerstroke 6.7 — quick triage
Active regen failing? Here's what we look at first before recommending a $1,500 DPF clean.
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