P1381 — Misfire Detected — No EBCM/PCM Serial Data
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1381 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1381 means on specific makes
Chevy / GMC / Cadillac / Buick CAUTION
Closely related to P1380 — the PCM lost the rough-road misfire-discrimination serial data link with the EBCM. Indicates a communication/ABS fault affecting misfire detection.
- EBCM/ABS communication loss ($varies)
- Serial data (Class 2) wiring fault ($50-200)
- ABS module failure ($100-400)
Check first: Diagnose the serial data bus and EBCM communication; check ABS for codes.
Source: GM code lists