P1380 — Misfire Detected — Rough Road Data Not Available (EBCM)
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1380 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1380 means on specific makes
Chevy / GMC / Cadillac / Buick CAUTION
GM-specific: the misfire monitor can't get rough-road data from the ABS module (EBCM) over the serial data line, so it can't reliably distinguish real misfires from road bumps. Often appears WITH P0300. Points to an EBCM/ABS communication problem, not the engine itself.
- Loss of EBCM/ABS serial data ($varies)
- ABS module or wiring fault ($100-400)
- Class 2 data line fault ($50-200)
- Genuine misfire present (fix that first) ($varies)
Check first: Check for ABS codes and Class-2 serial data communication with the EBCM; resolve any real misfire (P0300) too.
Source: engine-codes / Blazer Forum