Last Updated: Mar 2, 2010
Honda ECU Codes / CEL Codes
  


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CEL Code
Problem
Cause
1
Oxygen Sensor "A" (Primary)
bad wiring or unplugged / bad sensor
2
Oxygen Sensor "B"
bad wiring or unplugged / bad sensor
3
MAP Sensor (Manifold Absolute Pressure)
bad wiring or unplugged / bad sensor / boost
4
CKP Sensor (Crankshaft Position Sensor)
bad wiring or unplugged / bad sensor
5
MAP Sensor (Manifold Absolute Pressure)
mechanical problem / disconnected piping
6
ECT Sensor (Engine Coolant Temperature)
bad wiring or unplugged / bad sensor / low fluid
7
TP Sensor (Throttle Position) (TPS)
bad wiring or unplugged / bad sensor
8
TDC Sensor (Top Dead Center)
bad wiring or unplugged / bad sensor
9
CYP Sensor (Cylinder)
bad wiring or unplugged / bad sensor
10
IAT Sensor (Intake Air Temperature)
bad wiring or unplugged / bad sensor
12
EGR Lift Sensor (Exhaust Gas Recirculation)
bad wiring or unplugged / bad sensor
13
BARO Sensor (Atmospheric Pressure)
bad wiring or unplugged / bad sensor
14
IAC Valve (Idle Air Control)
bad wiring or unplugged / bad sensor
15
Ignition Output Signal
missing or defective ignition output signal
16
Fuel Injector System
bad wiring or unplugged / defective fuel injector
17
VSS (Vehicle Speed Sensor)
bad wiring or unplugged / bad sensor
19
Automatic Transmission Lock Up Control Solenoid Valve
bad wiring or unplugged / bad sensor
20
Electrical Load Detector
bad wiring or unplugged / bad sensor
21
VTEC Solenoid Valve
bad wiring or unplugged / defective solenoid valve
22
VTEC Oil Pressure Switch
bad wiring or unplugged / defective oil pressure switch
23
KS (Knock Sensor)
bad wiring or unplugged / bad sensor
30
Automatic Transmission Signal "A" / SEAF / SEFA / TMA / TMB
bad wiring or unplugged / bad sensor
31
Automatic Transmission Signal "B"
bad wiring or unplugged / bad sensor
41
Primary Oxygen Sensor - Heater
circuit malfunction
43
Fuel Supply System
defective or malfunctioning fuel supply system
45
System Too Lean or Too Rich
malfunction in the fuel monitoring systems
48
LAF Sensor (Lean Air Fuel)
bad wiring or unplugged / bad sensor
54
CKF Sensor (Crankshaft Speed Fluctuation)
bad wiring or unplugged / bad sensor
58
TDC Sensor 2 (Top Dead Center)
bad wiring or unplugged / bad sensor
61
Oxygen Sensor, Heated - Sensor 1 (Primary)
high voltage, low voltage, or slow response
63
Oxygen Sensor, Heated - Sensor 2 (Secondary)
high voltage, low voltage, or slow response
65
Oxygen Sensor Heater (Secondary)
malfunctioning or defective oxygen sensor heater
67
Catalyst system Efficiency Below Threshold
malfunctioning or defective catalyst system (bad cat)
70
Automatic Transmission
malfunction with the automatic transmission controls
71
Cylinder 1 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
72
Cylinder 2 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
73
Cylinder 3 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
74
Cylinder 4 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
75
Cylinder 5 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
76
Cylinder 6 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
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