Engine speed
Last reviewed 2026-08-31
Mode 01 · PID 0C (decimal 12)
Description
Crankshaft speed. The most widely implemented Mode 01 PID. On a hybrid this is the ICE, not MG1/MG2.
- PID number
- 0C · 12
- Unit
- rpm
- Range
- 0 … 16383.75
- Data bytes
- 2
- Formula
- ((A*256)+B)/4
- Also valid as Mode 02 freeze-frame data (same PID number, snapshot at last DTC).
Defined by SAE J1979 / ISO 15031-5. Public index — not a substitute for the paid SAE document.
Signals that use this PID
Sources
Provenance for this page. Official standards outrank community notes. See the confidence policy.
Official standard · high trust
SAE J1979 / ISO 15031-5 Mode 01 PID formulas (public index)
J1979 Mode 01 public formula