Engine run time
Last reviewed 2026-08-31
Mode 01 · PID 7F (decimal 127)
Description
Extended engine run-time counters (total and/or keyed). Byte A is typically a support/layout field.
- PID number
- 7F · 127
- Unit
- s
- Range
- —
- Data bytes
- 13
- Formula
- B*(2^24)+C*(2^16)+D*(2^8)+E (and further counters)
- 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.
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 public PID index: 01 7F