Honda OBD I Diagnostic Trouble Codes
Honda Motor Corporation OBD I diagnostic trouble codes are retrieveable without any special tools by simply following the instructions here. The codes are listed for Accord or Civic models seperately when required. The codes are defined as to what system is affected. When possible we give the more commonly known OBD II component name.
This information combined with proper testing procedures, specifications, and tools like a digital multimeter can help you fix the vehicle right the first time. OBD diagnostic does not have to be difficult or inconclusive.
This is not meant to be a substitute for information in the factory service manuals or the product service training manuals.
automotive multimeter measures volts, amps, ohms, frequency, temperatures
12 Volt Test Probe
test power and ground circuits easily, tests fuses without removal
| Code | Model | Description |
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| 0 | Accord Civic | No Signal To Engine Control Module (ECM PCM) |
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| 1 | Accord Civic | Problem In Heated Oxygen Sensor (HO2S) Circuit |
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| 3 | Accord Civic | Electrical Problem In Manifold Absolute Pressure (MAP) Sensor |
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| 4 | Accord Civic | Open Or Shorted Crank Sensor (CKP) Signal Circuit |
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| 5 | Accord Civic | Mechanical Problem In Manifold Absolute Pressure (MAP) Sensor |
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| 6 | Accord Civic | Open Or Shorted Coolant Temp Sensor (CTS) Signal Circuit |
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| 7 | Accord Civic | Open Or Shorted Throttle Position (TPS) Sensor Signal Circuit |
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| 8 | Accord Civic | Open Or Shorted Crank Angle Sensor (TDC) Sensor Signal Circuit |
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| 9 | Accord Civic | Open Or Shorted Crank Angle Sensor (CYP) Sensor Signal Circuit |
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| 10 | Accord Civic | Intake Air Temperature (IAT) Problem with sensor |
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| 12 | Accord Civic | No Exhaust Gas Recirculation (EGR) Action |
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| 13 | Accord Civic | Barometric Pressure (BARO) Sensor Problem with sensor |
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| 14 | Accord Civic | Open Or Shorted Idle Air Control (IAC) Valve Signal Circuit |
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| 15 | Accord Civic | Ignition Output Signal Problem In Signal Circuit |
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| 16 | Accord Civic | Problem In Fuel Injector Circuit |
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| 17 | Accord Civic | Open Or Shorted Vehicle Speed Sensor (VSS) Signal Circuit |
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| 19 | Civic | Problem with A/T Lock-Up Control Solenoid Valve (TCC) |
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| 20 | Accord Civic | Problem With Electrical Load Detector (ELD) |
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| 21 | Civic | Problem With Variable Timing Electronic Control (VTEC) Spool Solenoid Circuit |
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| 22 | Civic | Problem In Variable Timing Electronic Control (VTEC) Oil Pressure Switch Circuit |
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| 30 | Accord Civic | Problem In A/T Control Unit And Engine Control Module (ECM PCM) Signal A Circuit |
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| 31 | Accord Civic | Problem In A/T Control Unit And Engine Control Module (ECM PCM) Signal B Circuit |
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| 41 | Accord Civic | Problem With Heated Oxygen Sensor (HO2S) Heater |
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| 43 | Accord Civic | Problem With Heated Oxygen Sensor (HO2S) Circuit Or Fuel System |
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| 48 | Civic | Problem With Heated Oxygen Sensor (HO2S) Circuit |
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Using The MIL Light To Get Codes
Turn the key to the "on" position to confirm that the Malfunction Indicator Light (MIL) functions.
With ignition off, insert jumper wire in service check connector terminals, located behind right side of dash. Image shows connectors and locations
Turn ignition switch to ON position. Diagnostic Trouble Codes (DTCs) will be indicated by a series of long and short flashes on the Malfunction Indicator Lamp (MIL).
The number of long flashes indicates the number in the 10s column. The number of short flashes indicates the number in the 1s column. For example, 3 long flashes followed by 1 short flash would indicate DTC 31.
