List of Honda OBD1 CodesList of Honda OBD1 Codes

Complete List Of Honda Obd1 DTC Codes

These are the complete lists of OBD1 codes for Honda cars. The diagnostic trouble code number, the fault location, and the possible cause of trouble are in the description below.

DTC Code: 0
Fault Location: Engine control module (ECM)
Possible Cause: ECM

 

DTC Code: 1
Fault Location: Heated oxygen sensor (HO2S)/oxygen sensor (O2S) Bank2
Possible Cause: Fuel pressure/pump, wiring short to earth/open circuit/short to positive, HO2S/O2S, ECM

 

DTC Code: 2
Fault Location: Heated oxygen sensor (HO2S) 1 , bank 1
Possible Cause: Fuel pressure/pump, wiring short to earth/open circuit/short to positive, HO2S/O2S, ECM

 

DTC Code: 2 (Honda Accord Only)
Fault Location: Vehicle speed sensor (VSS), MT – circuit malfunction/range/performance problem
Possible Cause: Wiring, speedometer, VSS, ECM

 

DTC Code: 3
Fault Location: Manifold absolute pressure (MAP) sensor – circuit
Possible Cause: Wiring, supply voltage, MAP sensor, ECM

 

DTC Code: 4
Fault Location: Engine speed (RPM) sensor
Possible Cause: Wiring, RPM sensor, ECM

 

DTC Code: 5
Fault Location: Manifold absolute pressure (MAP) sensor – signal
Possible Cause: Intake leak, vacuum hose blocked, wiring, MAP sensor, ECM

 

DTC Code: 6
Fault Location: Engine coolant temperature (ECT) sensor
Possible Cause: Wiring short to earth/open circuit, ECT sensor, ECM

 

DTC Code: 7
Fault Location: Throttle position (TP) sensor
Possible Cause: Wiring short to earth/open circuit, TP sensor, ECM

 

DTC Code: 8
Fault Location: Crankshaft position (CKP) sensor
Possible Cause: CKP sensor, wiring short to earth/open circuit, ECM

 

DTC Code: 9
Fault Location: Camshaft position (CMP) sensor
Possible Cause: CMP sensor, wiring short to earth/open circuit, ECM

 

DTC Code: 10
Fault Location: Intake air temperature (IAT) sensor
Possible Cause: Wiring short to earth/open circuit, IAT sensor, ECM

 

DTC Code: 11
Fault Location: Mixture adjustment resistor – voltage low/high
Possible Cause: Wiring short/open circuit, IAT sensor, ECM

 

DTC Code: 12
Fault Location: Exhaust gas recirculation (EGR) system – control
Possible Cause: Wiring, vacuum hose(s), EGR solenoid, EGR valve position sensor, EGR valve, ECM

 

DTC Code: 13
Fault Location: Barometric pressure (BARO) sensor – malfunction
Possible Cause: ECM

 

DTC Code: 14
Fault Location: Idle air control (IAC) valve – circuit
Possible Cause: Wiring, supply voltage, IAC valve, ECM

 

DTC Code: 15
Fault Location: Ignition amplifier – control circuit
Possible Cause: Wiring, supply voltage, ignition amplifier, ECM

 

DTC Code: 16
Fault Location: Injectors
Possible Cause: Wiring, supply voltage, injector, ECM

 

DTC Code: 17
Fault Location: Vehicle speed sensor (VSS)
Possible Cause: Wiring, VSS, ECM

 

DTC Code: 18
Fault Location: Ignition timing adjuster – circui
Possible Cause: Wiring, supply voltage, ignition timing adjuster

 

DTC Code: 19
Fault Location: Transmission lock-up solenoid
Possible Cause: Wiring, solenoid, ECM

 

DTC Code: 20
Fault Location: Electrical load sensor
Possible Cause: Wiring, electrical load sensor, ECM

 

DTC Code: 21
Fault Location: Camshaft position (CMP) actuator
Possible Cause: Wiring, CMP actuator, ECM

 

DTC Code: 21
Fault Location: VTEC system – malfunction
Possible Cause: Wiring, VTEC solenoid, VTEC pressure switch, ECM

 

DTC Code: 22
Fault Location: VTEC system – malfunction
Possible Cause: Wiring, VTEC solenoid, VTEC pressure switch, ECM

 

DTC Code: 22
Fault Location: Camshaft position (CMP) actuator oil pressure switch
Possible Cause: Wiring, CMP actuator oil pressure switch, ECM

 

DTC Code: 23
Fault Location: Knock sensor (KS)
Possible Cause: Wiring, KS, ECM

 

DTC Code: 30
Fault Location: Transmission control module (TCM) to engine control module (ECM) signal A – circuit malfunction
Possible Cause: Wiring, TCM, ECM

 

DTC Code: 31
Fault Location: Transmission control module (TCM) to engine control module (ECM) signal B – circuit malfunction
Possible Cause: Wiring, TCM, ECM

 

DTC Code: 34
Fault Location: Engine control module (ECM) supply voltage – malfunction
Possible Cause: Wiring, poor connection, battery, alternator

 

DTC Code: 35
Fault Location: Traction control/engine control module (ECM) – signal
Possible Cause: Wiring, TCM, ECM

 

DTC Code: 36
Fault Location: Traction control/engine control module (ECM) – signal
Possible Cause: Wiring, TCM, ECM

 

DTC Code: 39
Fault Location: CAN data bus – malfunction
Possible Cause: Wiring, connected system, ECM

 

DTC Code: 41
Fault Location: Oxygen sensor heater – circuit malfunction
Possible Cause: Wiring short to earth/open circuit/short to positive, HO2S, ECM

 

DTC Code: 43
Fault Location: Heated oxygen sensor (HO2S)/fuel supply system -circuit malfunction
Possible Cause: Wiring, fuel pressure/pump/filter, injector, HO2S, ECM

 

DTC Code: 44
Fault Location: Heated oxygen sensor (HO2S)/fuel supply system , bank 1 – circuit malfunction
Possible Cause: Wiring, fuel pressure/pump/filter, injector, HO2S, ECM

 

DTC Code: 45
Fault Location: System too lean/rich
Possible Cause: Fuel system, HO2S, MAP sensor, contaminated fuel, valve clearance, exhaust leak

 

DTC Code: 48
Fault Location: Heated oxygen sensor (HO2S) – circuit malfunction
Possible Cause: Wiring, HO2S, ECM

 

DTC Code: 53
Fault Location: Knock sensor (KS) – voltage low
Possible Cause: Wiring, poor connection, KS, ECM

 

DTC Code: 54
Fault Location: Engine speed fluctuation sensor
Possible Cause: Wiring, engine speed fluctuation sensor, ECM

 

DTC Code: 59
Fault Location: Camshaft position (CMP) sensor
Possible Cause: CMP sensor, wiring short to earth/open circuit, ECM

 

DTC Code: 63
Fault Location: Heated oxygen sensor (HO2S) 2 – malfunction
Possible Cause: Wiring, HO2S, ECM

 

DTC Code: 65
Fault Location: Heated oxygen sensor (HO2S) 2, heater control – circuit malfunction
Possible Cause: Wiring, HO2S, ECM

 

DTC Code: 70
Fault Location: Shift solenoid (SS) A – circuit malfunction
Possible Cause: Wiring, HO2S, ECM

 

DTC Code: 71
Cylinder 1 – misfire
Fault Location: Ignition/fuel system/VTEC system, injector, wiring,
Possible Cause: mechanical fault

 

DTC Code: 71
Fault Location: Injector 1 – circuit malfunction
Possible Cause: Wiring, injector, ECM

 

DTC Code: 72
Fault Location: Cylinder 2 – misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 72
Fault Location: Cylinder 2 – misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 72
Fault Location: Injector 2 – circuit malfunction
Possible Cause: Wiring, injector, ECM

 

DTC Code: 73
Fault Location: Cylinder 3 – misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 73
Fault Location: Cylinder 3 – misfire
Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 73
Fault Location: Injector 3 – circuit malfunction
Possible Cause: Wiring, injector, ECM

 

DTC Code: 74
Fault Location: Cylinder 4 – misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 74
Fault Location: Cylinder 4 – misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 74
Fault Location: Injector 4 – circuit malfunction
Possible Cause: Wiring, injector, ECM

 

DTC Code: 75
Fault Location: Random misfire
Possible Cause: Ignition/fuel system/VTEC system, injector, wiring, mechanical fault

 

DTC Code: 80
Fault Location: Exhaust gas recirculation (EGR) system – insufficient flow detected
Possible Cause: EGR valve, EGR solenoid, hose leak/blockage

 

DTC Code: 84
Fault Location: Secondary air injection (AIR) solenoid – circuit malfunction
Possible Cause: Wiring, AIR solenoid, ECM

 

DTC Code: 86
Fault Location: Engine coolant temperature (ECT) sensor – range/performance problem
Possible Cause: ECT sensor, engine cooling system

 

DTC Code: 89
Fault Location: AT – gear shift malfunction
Possible Cause: Wiring, transmission range (TR) switch, ECM

 

DTC Code: 92
Fault Location: Evaporative emission (EVAP) canister purge valve – circuit
Possible Cause: malfunction Wiring, EVAP valve, ECM

 

Hello, I compiled this list of OBD1 trouble codes in case you need it. Thank you very much for visiting my website:) -Erwin Salarda 

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