Commanded diesel exhaust fluid dosing
Last reviewed 2026-08-31
Mode 01 · PID A5 (decimal 165)
Description
Commanded DEF dosing. Bit A0 indicates support; byte B / 2 is percent.
- PID number
- A5 · 165
- Unit
- %
- Range
- 0 … 127.5
- Data bytes
- 4
- Formula
- [A0]=supported ; B/2
- 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 A5