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OBD2 — Universal

Supported Signals

SAE J1979 Mode 01 PIDs polled via ISO 15765-2 (CAN). Works with any OBD2-compliant vehicle. PIDs are polled in a weighted round-robin schedule — high-priority PIDs are requested 3× more often than normal PIDs.

500 kbit/s Request: 0x7DF Response: 0x7E8 SAE J1979 Mode 01

The gauge polls one PID at a time and moves to the next on response or 50 ms timeout. High-priority PIDs (RPM, Speed, MAP) are queued 3× more frequently than normal PIDs. Not all vehicles support all PIDs — the gauge silently skips unsupported ones. DTC reading and clearing (Mode 03 / 04) is available from the CAN Bus info screen in the gauge menu.

High Priority PIDs Polled 3× more frequently than normal PIDs (~30 ms interval)
PID (hex)SignalUnit / Notes
0x0C Engine RPM rpm
0x0D Vehicle Speed km/h
0x0B MAP / Boost psi (gauge)
Normal Priority PIDs Polled in round-robin, every ~4th slot
PID (hex)SignalUnit / Notes
0x01 CEL / MIL Status + DTC Count flag
0x04 Engine Load (Calculated) %
0x05 Coolant Temp (CLT) °C
0x06 Short Term Fuel Trim Bank 1 %
0x07 Long Term Fuel Trim Bank 1 %
0x08 Short Term Fuel Trim Bank 2 %
0x09 Long Term Fuel Trim Bank 2 %
0x0A Fuel Pressure psi
0x0E Ignition Timing Advance ° BTDC
0x0F Intake Air Temp (IAT) °C
0x10 MAF Air Flow Rate g/s
0x11 Throttle Position (TPS) %
0x2F Fuel Level %
0x33 Barometric Pressure kPa
0x3C Catalyst Temp Bank 1 Sensor 1 °C
0x3D Catalyst Temp Bank 2 Sensor 1 °C
0x42 Battery / Module Voltage V
0x44 Lambda / AFR (Commanded) λ and AFR
0x46 Ambient Air Temp °C
0x4F Max MAF Air Flow Rate g/s
0x5A Relative Accelerator Pedal Position %
0x5B Hybrid Battery Pack SOC %
0x5C Engine Oil Temp °C
0x5E Engine Fuel Rate L/h
Extended PIDs
PID (hex)Signal(s)Unit
0x50 Max Air g/s
0x03 Fuel Sys —
0x12 Sec Air —
0x14
SIG_OBD2_O2S1_V + s SIG_OBD2_O2S1_TRIM + s
— —
0x15
SIG_OBD2_O2S1_V + s SIG_OBD2_O2S1_TRIM + s
— —
0x16
SIG_OBD2_O2S1_V + s SIG_OBD2_O2S1_TRIM + s
— —
0x17
SIG_OBD2_O2S1_V + s SIG_OBD2_O2S1_TRIM + s
— —
0x1F Run Time min
0x21 Dist MIL km
0x22 Rail Rel kPa
0x23 Rail Pres bar
0x59 Rail Pres bar
0x24 SIG_OBD2_O2S1_LAMBDA + s —
0x25 SIG_OBD2_O2S1_LAMBDA + s —
0x26 SIG_OBD2_O2S1_LAMBDA + s —
0x27 SIG_OBD2_O2S1_LAMBDA + s —
0x34 SIG_OBD2_O2S1_LAMBDA + s —
0x35 SIG_OBD2_O2S1_LAMBDA + s —
0x36 SIG_OBD2_O2S1_LAMBDA + s —
0x37 SIG_OBD2_O2S1_LAMBDA + s —
0x2C EGR Cmd %
0x2D EGR Err %
0x2E Evap Purge %
0x30 Warm-ups —
0x31 Dist Clear km
0x32 Evap Pres Pa
0x54 Evap Pres Pa
0x3E Cat B1S2 °C
0x3F Cat B2S2 °C
0x43 Abs Load %
0x45 Rel TPS %
0x47 TPS B %
0x48 TPS C %
0x49 Pedal D %
0x4A Pedal E %
0x4B Pedal F %
0x4C Thr Cmd %
0x4D MIL Time min
0x4E Clear Time min
0x51 Fuel Type —
0x52 Ethanol %
0x53 Evap Abs kPa
0x55 Sec ST B1 %
0x56 Sec LT B1 %
0x57 Sec ST B2 %
0x58 Sec LT B2 %
0x5D Inj Timing °
0x61 Tq Demand %
0x62 Tq Actual %
0x63 Tq Ref Nm
0xA4 Gear Ratio —
Diagnostics (Manual Trigger from Menu)
ModeFunctionNotes
Mode 03 Read Stored DTCs Returns up to 12 DTC codes — ISO-TP multi-frame reassembly supported
Mode 04 Clear DTCs Clears all stored fault codes and resets MIL