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Commands

OBD-II adapter (ELM327 commands)

PID Name Descrip!on Response Value

N/A ELM_VERSION OBD-II adapter version string string

N/A ELM_VOLTAGE Voltage detected by OBD-II adapter Unit.volt

Mode 01
 v: latest 

PID Name Descrip!on Response Va

00 PIDS_A Supported PIDs [01-20] BitArray

01 STATUS Status since DTCs cleared special

02 FREEZE_DTC DTC that triggered the freeze frame special

03 FUEL_STATUS Fuel System Status (string, string

04 ENGINE_LOAD Calculated Engine Load Unit.percent

05 COOLANT_TEMP Engine Coolant Temperature Unit.celsius

06 SHORT_FUEL_TRIM_1 Short Term Fuel Trim - Bank 1 Unit.percent

07 LONG_FUEL_TRIM_1 Long Term Fuel Trim - Bank 1 Unit.percent

08 SHORT_FUEL_TRIM_2 Short Term Fuel Trim - Bank 2 Unit.percent

09 LONG_FUEL_TRIM_2 Long Term Fuel Trim - Bank 2 Unit.percent

0A FUEL_PRESSURE Fuel Pressure Unit.kilopasc

0B INTAKE_PRESSURE Intake Manifold Pressure Unit.kilopasc

0C RPM Engine RPM Unit.rpm

0D SPEED Vehicle Speed Unit.kph

0E TIMING_ADVANCE Timing Advance Unit.degree

0F INTAKE_TEMP Intake Air Temp Unit.celsius

10 MAF Air Flow Rate (MAF) Unit.grams_p

11 THROTTLE_POS Thro!le Posi"on Unit.percent

12 AIR_STATUS Secondary Air Status string

13 O2_SENSORS O2 Sensors Present special

14 O2_B1S1 O2: Bank 1 - Sensor 1 Voltage Unit.volt

15 O2_B1S2 O2: Bank 1 - Sensor 2 Voltage Unit.volt

16 O2_B1S3 O2: Bank 1 - Sensor 3 Voltage Unit.volt

17 O2_B1S4 O2: Bank 1 - Sensor 4 Voltage Unit.volt

18 O2_B2S1 O2: Bank 2 - Sensor 1 Voltage Unit.volt

19 O2_B2S2 O2: Bank 2 - Sensor 2 Voltage Unit.volt

1A O2_B2S3 O2: Bank 2 - Sensor 3 Voltage Unit.volt

1B O2_B2S4 O2: Bank 2 - Sensor 4 Voltage Unit.volt

1C OBD_COMPLIANCE OBD Standards Compliance string

1D O2_SENSORS_ALT O2 Sensors Present (alternate) special

1E AUX_INPUT_STATUS Auxiliary input status (power take off) boolean

1F RUN_TIME Engine Run Time Unit.second

20 PIDS_B Supported PIDs [21-40] BitArray

21 DISTANCE_W_MIL Distance Traveled with MIL on Unit.kilomete

22 FUEL_RAIL_PRESSURE_VAC Fuel Rail Pressure (rela"ve to vacuum) Unit.kilopasc

23 FUEL_RAIL_PRESSURE_DIRECT Fuel Rail Pressure (direct inject) Unit.kilopasc

24 O2_S1_WR_VOLTAGE 02 Sensor 1 WR Lambda Voltage Unit.volt

25 O2_S2_WR_VOLTAGE 02 Sensor 2 WR Lambda Voltage Unit.volt

26 O2_S3_WR_VOLTAGE 02 Sensor 3 WR Lambda Voltage Unit.volt

27 O2_S4_WR_VOLTAGE 02 Sensor 4 WR Lambda Voltage Unit.volt

28 O2_S5_WR_VOLTAGE 02 Sensor 5 WR Lambda Voltage Unit.volt

29 O2_S6_WR_VOLTAGE 02 Sensor 6 WR Lambda Voltage Unit.volt

2A O2_S7_WR_VOLTAGE 02 Sensor 7 WR Lambda Voltage Unit.volt

2B O2_S8_WR_VOLTAGE 02 Sensor 8 WR Lambda Voltage Unit.volt

2C COMMANDED_EGR Commanded EGR Unit.percent

2D EGR_ERROR EGR Error Unit.percent

2E EVAPORATIVE_PURGE Commanded Evapora"ve Purge Unit.percent

2F FUEL_LEVEL Fuel Level Input Unit.percent

30 WARMUPS_SINCE_DTC_CLEAR Number of warm-ups since codes cleared Unit.count

31 DISTANCE_SINCE_DTC_CLEAR Distance traveled since codes cleared Unit.kilomete

32 EVAP_VAPOR_PRESSURE Evapora"ve system vapor pressure Unit.pascal

33 BAROMETRIC_PRESSURE Barometric Pressure Unit.kilopasc

34 O2_S1_WR_CURRENT 02 Sensor 1 WR Lambda Current Unit.milliamp

35 O2_S2_WR_CURRENT 02 Sensor 2 WR Lambda Current Unit.milliamp

36 O2_S3_WR_CURRENT 02 Sensor 3 WR Lambda Current Unit.milliamp

37 O2_S4_WR_CURRENT 02 Sensor 4 WR Lambda Current Unit.milliamp

38 O2_S5_WR_CURRENT 02 Sensor 5 WR Lambda Current Unit.milliamp

39 O2_S6_WR_CURRENT 02 Sensor 6 WR Lambda Current Unit.milliamp

3A O2_S7_WR_CURRENT 02 Sensor 7 WR Lambda Current Unit.milliamp

3B O2_S8_WR_CURRENT 02 Sensor 8 WR Lambda Current Unit.milliamp

3C CATALYST_TEMP_B1S1 Catalyst Temperature: Bank 1 - Sensor 1 Unit.celsius

3D CATALYST_TEMP_B2S1 Catalyst Temperature: Bank 2 - Sensor 1 Unit.celsius

3E CATALYST_TEMP_B1S2 Catalyst Temperature: Bank 1 - Sensor 2 Unit.celsius

3F CATALYST_TEMP_B2S2 Catalyst Temperature: Bank 2 - Sensor 2 Unit.celsius

40 PIDS_C Supported PIDs [41-60] BitArray

41 STATUS_DRIVE_CYCLE Monitor status this drive cycle special

42 CONTROL_MODULE_VOLTAGE Control module voltage Unit.volt

43 ABSOLUTE_LOAD Absolute load value Unit.percent

44 COMMANDED_EQUIV_RATIO Commanded equivalence ra"o Unit.ra"o

45 RELATIVE_THROTTLE_POS Rela"ve thro!le posi"on Unit.percent

46 AMBIANT_AIR_TEMP Ambient air temperature Unit.celsius

47 THROTTLE_POS_B Absolute thro!le posi"on B Unit.percent

48 THROTTLE_POS_C Absolute thro!le posi"on C Unit.percent

49 ACCELERATOR_POS_D Accelerator pedal posi"on D Unit.percent

4A ACCELERATOR_POS_E Accelerator pedal posi"on E Unit.percent

4B ACCELERATOR_POS_F Accelerator pedal posi"on F Unit.percent

4C THROTTLE_ACTUATOR Commanded thro!le actuator Unit.percent

4D RUN_TIME_MIL Time run with MIL on Unit.minute

4E TIME_SINCE_DTC_CLEARED Time since trouble codes cleared Unit.minute

4F unsupported unsupported

50 MAX_MAF Maximum value for mass air flow sensor Unit.grams_p

51 FUEL_TYPE Fuel Type string

52 ETHANOL_PERCENT Ethanol Fuel Percent Unit.percent

53 EVAP_VAPOR_PRESSURE_ABS Absolute Evap system Vapor Pressure Unit.kilopasc

 54 EVAP_VAPOR_PRESSURE_ALT Evap system vapor pressure Unit.pascal

55 SHORT_O2_TRIM_B1 Short term secondary O2 trim - Bank 1 Unit.percent

56 LONG_O2_TRIM_B1 Long term secondary O2 trim - Bank 1 Unit.percent

57 SHORT_O2_TRIM_B2 Short term secondary O2 trim - Bank 2 Unit.percent

58 LONG_O2_TRIM_B2 Long term secondary O2 trim - Bank 2 Unit.percent

59 FUEL_RAIL_PRESSURE_ABS Fuel rail pressure (absolute) Unit.kilopasc

5A RELATIVE_ACCEL_POS Rela"ve accelerator pedal posi"on Unit.percent

5B HYBRID_BATTERY_REMAINING Hybrid ba!ery pack remaining life Unit.percent

5C OIL_TEMP Engine oil temperature Unit.celsius

5D FUEL_INJECT_TIMING Fuel injec"on "ming Unit.degree

5E FUEL_RATE Engine fuel rate Unit.liters_pe

5F unsupported unsupported

Mode 02

Mode 02 commands are the same as mode 01, but are metrics from when the last DTC
occurred (the freeze frame). To access them by name, simple prepend DTC_ to the
Mode 01 command name.

import obd

obd.commands.RPM # the Mode 01 command

# vs.
obd.commands.DTC_RPM # the Mode 02 command

Mode 03
Mode 03 contains a single command GET_DTC which requests all diagnos"c trouble
codes from the vehicle. The response will contain the codes themselves, as well as a
descrip"on (if python-OBD has one). See the DTC Responses sec"on for more details.

PID Name Descrip!on Response Value

N/A GET_DTC Get Diagnos"c Trouble Codes special

Mode 04

PID Name Descrip!on Response Value

N/A CLEAR_DTC Clear DTCs and Freeze data N/A

Mode 06

WARNING: mode 06 is experimental. While it passes so!ware tests, it has not been tested on
a real vehicle. Any debug output for this mode would be greatly appreciated.

Mode 06 commands are used to monitor various test results from the vehicle. All
commands in this mode return the same datatype, as described in the Monitor
Response sec"on. Currently, mode 06 commands are only implemented for CAN
protocols (ISO 15765-4).

PID Name Descrip!on

00 MIDS_A Supported MIDs [01-20]

01 MONITOR_O2_B1S1 O2 Sensor Monitor Bank 1 - Sensor 1

02 MONITOR_O2_B1S2 O2 Sensor Monitor Bank 1 - Sensor 2

03 MONITOR_O2_B1S3 O2 Sensor Monitor Bank 1 - Sensor 3

04 MONITOR_O2_B1S4 O2 Sensor Monitor Bank 1 - Sensor 4

05 MONITOR_O2_B2S1 O2 Sensor Monitor Bank 2 - Sensor 1

06 MONITOR_O2_B2S2 O2 Sensor Monitor Bank 2 - Sensor 2

07 MONITOR_O2_B2S3 O2 Sensor Monitor Bank 2 - Sensor 3

08 MONITOR_O2_B2S4 O2 Sensor Monitor Bank 2 - Sensor 4

09 MONITOR_O2_B3S1 O2 Sensor Monitor Bank 3 - Sensor 1

0A MONITOR_O2_B3S2 O2 Sensor Monitor Bank 3 - Sensor 2

0B MONITOR_O2_B3S3 O2 Sensor Monitor Bank 3 - Sensor 3

0C MONITOR_O2_B3S4 O2 Sensor Monitor Bank 3 - Sensor 4

0D MONITOR_O2_B4S1 O2 Sensor Monitor Bank 4 - Sensor 1

0E MONITOR_O2_B4S2 O2 Sensor Monitor Bank 4 - Sensor 2

0F MONITOR_O2_B4S3 O2 Sensor Monitor Bank 4 - Sensor 3

10 MONITOR_O2_B4S4 O2 Sensor Monitor Bank 4 - Sensor 4

gap

20 MIDS_B Supported MIDs [21-40]

21 MONITOR_CATALYST_B1 Catalyst Monitor Bank 1

22 MONITOR_CATALYST_B2 Catalyst Monitor Bank 2

23 MONITOR_CATALYST_B3 Catalyst Monitor Bank 3

24 MONITOR_CATALYST_B4 Catalyst Monitor Bank 4

gap

31 MONITOR_EGR_B1 EGR Monitor Bank 1

32 MONITOR_EGR_B2 EGR Monitor Bank 2

33 MONITOR_EGR_B3 EGR Monitor Bank 3

34 MONITOR_EGR_B4 EGR Monitor Bank 4

35 MONITOR_VVT_B1 VVT Monitor Bank 1

36 MONITOR_VVT_B2 VVT Monitor Bank 2

37 MONITOR_VVT_B3 VVT Monitor Bank 3

38 MONITOR_VVT_B4 VVT Monitor Bank 4

39 MONITOR_EVAP_150 EVAP Monitor (Cap Off / 0.150\")

3A MONITOR_EVAP_090 EVAP Monitor (0.090\")

3B MONITOR_EVAP_040 EVAP Monitor (0.040\")

3C MONITOR_EVAP_020 EVAP Monitor (0.020\")

3D MONITOR_PURGE_FLOW Purge Flow Monitor

gap

40 MIDS_C Supported MIDs [41-60]

41 MONITOR_O2_HEATER_B1S1 O2 Sensor Heater Monitor Bank 1 - Sensor 1

42 MONITOR_O2_HEATER_B1S2 O2 Sensor Heater Monitor Bank 1 - Sensor 2

43 MONITOR_O2_HEATER_B1S3 O2 Sensor Heater Monitor Bank 1 - Sensor 3

44 MONITOR_O2_HEATER_B1S4 O2 Sensor Heater Monitor Bank 1 - Sensor 4

45 MONITOR_O2_HEATER_B2S1 O2 Sensor Heater Monitor Bank 2 - Sensor 1

46 MONITOR_O2_HEATER_B2S2 O2 Sensor Heater Monitor Bank 2 - Sensor 2

47 MONITOR_O2_HEATER_B2S3 O2 Sensor Heater Monitor Bank 2 - Sensor 3

48 MONITOR_O2_HEATER_B2S4 O2 Sensor Heater Monitor Bank 2 - Sensor 4

49 MONITOR_O2_HEATER_B3S1 O2 Sensor Heater Monitor Bank 3 - Sensor 1

4A MONITOR_O2_HEATER_B3S2 O2 Sensor Heater Monitor Bank 3 - Sensor 2

4B MONITOR_O2_HEATER_B3S3 O2 Sensor Heater Monitor Bank 3 - Sensor 3

4C MONITOR_O2_HEATER_B3S4 O2 Sensor Heater Monitor Bank 3 - Sensor 4

4D MONITOR_O2_HEATER_B4S1 O2 Sensor Heater Monitor Bank 4 - Sensor 1

4E MONITOR_O2_HEATER_B4S2 O2 Sensor Heater Monitor Bank 4 - Sensor 2

4F MONITOR_O2_HEATER_B4S3 O2 Sensor Heater Monitor Bank 4 - Sensor 3

50 MONITOR_O2_HEATER_B4S4 O2 Sensor Heater Monitor Bank 4 - Sensor 4

gap

60 MIDS_D Supported MIDs [61-80]

61 MONITOR_HEATED_CATALYST_B1 Heated Catalyst Monitor Bank 1

62 MONITOR_HEATED_CATALYST_B2 Heated Catalyst Monitor Bank 2

63 MONITOR_HEATED_CATALYST_B3 Heated Catalyst Monitor Bank 3

64 MONITOR_HEATED_CATALYST_B4 Heated Catalyst Monitor Bank 4

gap

71 MONITOR_SECONDARY_AIR_1 Secondary Air Monitor 1

72 MONITOR_SECONDARY_AIR_2 Secondary Air Monitor 2

73 MONITOR_SECONDARY_AIR_3 Secondary Air Monitor 3

74 MONITOR_SECONDARY_AIR_4 Secondary Air Monitor 4

gap

80 MIDS_E Supported MIDs [81-A0]

81 MONITOR_FUEL_SYSTEM_B1 Fuel System Monitor Bank 1

82 MONITOR_FUEL_SYSTEM_B2 Fuel System Monitor Bank 2

83 MONITOR_FUEL_SYSTEM_B3 Fuel System Monitor Bank 3

84 MONITOR_FUEL_SYSTEM_B4 Fuel System Monitor Bank 4

85 MONITOR_BOOST_PRESSURE_B1 Boost Pressure Control Monitor Bank 1

86 MONITOR_BOOST_PRESSURE_B2 Boost Pressure Control Monitor Bank 1

gap

90 MONITOR_NOX_ABSORBER_B1 NOx Absorber Monitor Bank 1

91 MONITOR_NOX_ABSORBER_B2 NOx Absorber Monitor Bank 2

gap
 98 MONITOR_NOX_CATALYST_B1 NOx Catalyst Monitor Bank 1

99 MONITOR_NOX_CATALYST_B2 NOx Catalyst Monitor Bank 2

gap

A0 MIDS_F Supported MIDs [A1-C0]

A1 MONITOR_MISFIRE_GENERAL Misfire Monitor General Data

A2 MONITOR_MISFIRE_CYLINDER_1 Misfire Cylinder 1 Data

A3 MONITOR_MISFIRE_CYLINDER_2 Misfire Cylinder 2 Data

A4 MONITOR_MISFIRE_CYLINDER_3 Misfire Cylinder 3 Data

A5 MONITOR_MISFIRE_CYLINDER_4 Misfire Cylinder 4 Data

A6 MONITOR_MISFIRE_CYLINDER_5 Misfire Cylinder 5 Data

A7 MONITOR_MISFIRE_CYLINDER_6 Misfire Cylinder 6 Data

A8 MONITOR_MISFIRE_CYLINDER_7 Misfire Cylinder 7 Data

A9 MONITOR_MISFIRE_CYLINDER_8 Misfire Cylinder 8 Data

AA MONITOR_MISFIRE_CYLINDER_9 Misfire Cylinder 9 Data

AB MONITOR_MISFIRE_CYLINDER_10 Misfire Cylinder 10 Data

AC MONITOR_MISFIRE_CYLINDER_11 Misfire Cylinder 11 Data

AD MONITOR_MISFIRE_CYLINDER_12 Misfire Cylinder 12 Data

gap

B0 MONITOR_PM_FILTER_B1 PM Filter Monitor Bank 1

B1 MONITOR_PM_FILTER_B2 PM Filter Monitor Bank 2

Mode 07
The return value will be encoded in the same structure as the Mode 03 GET_DTC

command.

PID Name Descrip!on Response Value

N/A GET_CURRENT_DTC Get DTCs from the current/last driving cycle special

Mode 09

WARNING: mode 09 is experimental. While it has been tested on a hardware simulator, only
a subset of the supported commands have (00-06) been tested. Any debug output for this
mode, especially for the untested PIDs, would be greatly appreciated.

PID Name Descrip!on

00 PIDS_9A Supported PIDs [01-20]

01 VIN_MESSAGE_COUNT VIN Message Count

02 VIN Vehicle Iden"fica"on Number

03 CALIBRATION_ID_MESSAGE_COUNT Calibra"on ID message count for PID 04

04 CALIBRATION_ID Calibra"on ID

05 CVN_MESSAGE_COUNT CVN Message Count for PID 06

06 CVN Calibra"on Verifica"on Numbers

07 PERF_TRACKING_MESSAGE_COUNT Performance tracking message count

08 PERF_TRACKING_SPARK In-use performance tracking (spark igni"on)

09 ECU_NAME_MESSAGE_COUNT ECU Name Message Count for PID 0A

0a ECU_NAME ECU Name

0b PERF_TRACKING_COMPRESSION In-use performance tracking (compression igni"on)