Hybrid/EV battery pack remaining life
Last reviewed 2026-08-31
Mode 01 · PID 5B (decimal 91)
Description
J1979 name is pack remaining life; many scan tools label it as HV battery SOC. Only present when the ECU implements this standard PID — many HEV/PHEV use manufacturer Mode 21/22 or UDS 0x22 instead.
- PID number
- 5B · 91
- Unit
- %
- Range
- 0 … 100
- Data bytes
- 1
- Formula
- A*100/255
- Also valid as Mode 02 freeze-frame data (same PID number, snapshot at last DTC).
- Hybrid-related standard PID. Many EU HEV/PHEV ECUs still hide pack data behind a manufacturer request. See standard vs manufacturer.
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