ABS disable switch state
Last reviewed 2026-08-31
Mode 01 · PID A9 (decimal 169)
Description
Whether an ABS-disable switch is present (A0) and its state (B0).
- PID number
- A9 · 169
- Unit
- —
- Range
- —
- Data bytes
- 4
- Formula
- A0 supported; B0 = Yes/No
- Also valid as Mode 02 freeze-frame data (same PID number, snapshot at last DTC).
- Bit-encoded or enumerated — not a single scaled physical value.
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 A9