Honda Error/Trouble Codes - hondatabase.com

How to Access the Service Connector

To access the service connector and retrieve trouble codes on your Honda vehicle, follow these steps:

Locate the two-pin service connector (usually inside a green rubber protection alongside a 3-pin connector) under the dashboard on the passenger side, near the ECU.
Using a jumper wire or paper clip, connect the two pins to complete the electrical circuit.
Turn the ignition key to the first position (ON) without starting the engine.
The Malfunction Indicator Light (MIL) will flash a specific pattern, indicating the trouble code(s).
Count the long and short flashes to determine the code(s).

Honda SCS Service Check Connector — *Note: For convenience, you can purchase a female SCS Service Check Connector from eBay or Amazon. This connector can be kept in your vehicle for easy access whenever you need to check error codes.*

Code 0-11

ECU: Engine Control Unit, the vehicle's main computer that controls engine and transmission functions.

Code 1

O2S11: Upstream oxygen sensor on bank 1, measures exhaust oxygen content to determine fuel mixture.

Code 2

O2S12: Downstream oxygen sensor on bank 1 after catalytic converter, monitors converter efficiency.

Code 3-5

MAP: Manifold Absolute Pressure sensor, measures intake manifold air pressure to determine engine load.

Code 4

CKP: Crankshaft position sensor, monitors crankshaft position and rotational speed.

Code 6

ECT: Engine coolant temperature sensor, measures the temperature of the engine coolant.

Code 7

TPS: Throttle position sensor, monitors throttle valve position.

Code 8

CMP: Camshaft position sensor, monitors camshaft position.

Code 9

CYP1: Cylinder 1 position sensor, tracks piston position in cylinder 1.

Code 10

IAT: Intake air temperature sensor, measures the temperature of the air entering the engine.

Code 12

EGR: Exhaust Gas Recirculation system, recirculates exhaust gases to engine intake to reduce emissions.

Code 13

BPS: Barometric pressure sensor, measures atmospheric pressure.

Code 14

IAC: Idle Air Control valve, controls engine idle speed. Code may also indicate faulty ECU.

Code 15

IGN: Ignition system malfunction detected.

Code 16

FINJ: Fuel injector circuit malfunction.

Code 17

VSS: Vehicle speed sensor, measures vehicle speed.

Code 19

TCC: Torque converter clutch solenoid malfunction in automatic transmission.

Code 20

ELD: Electrical load detector, monitors vehicle electrical system voltage.

Code 21

VTEC: Variable Valve Timing and Lift Electronic Control (VTEC) system solenoid valve malfunction.

Code 22

VTEC: VTEC pressure switch malfunction.

Code 23

KS: Knock sensor, detects engine knocking or pre-ignition.

Code 30

ATISS: Automatic transmission input speed sensors A and B malfunction.

Code 41

O2S11H: Upstream oxygen sensor heater circuit malfunction on bank 1.

Code 43

EVAP: Evaporative emissions (EVAP) system malfunction, prevents fuel vapor from escaping to atmosphere.

Code 45

FINJ: Fuel injection system malfunction.

Code 48

O2S21: Downstream oxygen sensor malfunction on bank 2 after catalytic converter.

Code 61

O2S21: Upstream oxygen sensor malfunction on bank 2.

Code 63

O2S22: Downstream oxygen sensor malfunction on bank 2 after catalytic converter.

Code 65

O2S22H: Downstream oxygen sensor heater malfunction on bank 2.

Code 67

CAT: Catalytic converter system efficiency below threshold.

Code 70

AT: Automatic transmission system malfunction.

Code 71-72-73-74-75-76

MIS: Misfire detected on specified engine cylinder (1-6).

Code 80

EGR: Exhaust Gas Recirculation (EGR) system malfunction.

Code 86

ECT: Engine coolant temperature sensor malfunction.

Code 92

EVAP: Evaporative emissions (EVAP) system malfunction, fuel vapor leaking/venting issue.