Public diagnostic desk

Put a plain-English meaning behind the code.

Paste the SPN and FMI from your scan tool. TorqueTelltale gives you the likely meaning, the vehicle context in our current reference set, and one sensible next check.

Try a known code

SPN 157 FMI 18

Fuel rail pressure · Cascadia context

Search the J1939 reference
Formats accepted: SPN 157 FMI 18, 157 FMI 18, or 157/18.

A bare SPN works when our reference set has only one FMI for it.

When the lookup is only the beginning

Move from a code to a repair-ready handoff.

Paid plans add guided tests, saved case history, and the Mechanic Proof report for a cleaner conversation with the shop.

See guided plans