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Mode 09 • PID 04

OBD2 PID 0904

Calibration ID

Definition

Mode
09 (hex)
PID
04 (hex)
Data bytes
16
Formula
HEX_to_ASCII
Units
—

How to read PID 0904

Send mode 09 with PID 04 over OBD-II. The ECU returns 16 data byte(s), decoded with HEX_to_ASCII (A, B, C, D are the returned bytes in order). The result is “Calibration ID”. This is standard SAE J1979 data supported by most OBD-II scan tools and loggers.

Why it matters for tuning

Live PIDs like this are how tuners and workshops verify a remap on the road — logging RPM, load, boost, lambda and temperatures to confirm the map is safe. The desktop Softechpro Solutions software complements live logging with offline ECU editing: DPF/EGR/AdBlue/DTC off and Stage tuning with automatic checksum.

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