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Mode 09 • PID 03

OBD2 PID 0903

Message Count for Calibration ID

Definition

Mode
09 (hex)
PID
03 (hex)
Data bytes
1
Units
—

How to read PID 0903

Send mode 09 with PID 03 over OBD-II. The ECU returns 1 data byte(s). The result is “Message Count for 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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