Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2008CIVIC SI, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 88 (FUEL SYSTEM & EMISSIONS SYSTEM (R18A1 ENGINE))DTC TROUBLESHOOTING INDEX
2008 Honda Civic Si, 4D Sedan
DTC Troubleshooting Index
2008 Honda Civic Si, 4D SedanSECTION DTC Troubleshooting Index
WARNING: This page is about a different variant/trim than selected.
NOTE:
For navigation links to specific DTC tests, see DTC INDEX (EXCEPT HYBRID)
or DTC INDEX (HYBRID)
.
DTC TROUBLESHOOTING INDEX
| DTC (MIL indication(1)) | Two Drive Cycle Detection | Detection Item | MIL | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P0101 (50) | ◦ | Mass Air Flow (MAF) Sensor Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P0102 (50) | - | Mass Air Flow (MAF) Sensor Circuit Low Voltage | ON | ||||||||||||||||||
| P0103 (50) | - | Mass Air Flow (MAF) Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P0107 (3) | - | Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | ON | ||||||||||||||||||
| P0108 (3) | - | Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P0111 (10) | ◦ | Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P0112 (10) | - | Intake Air Temperature (IAT) Sensor Circuit Low Voltage | ON | ||||||||||||||||||
| P0113 (10) | - | Intake Air Temperature (IAT) Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P0116 (86) | ◦ | Engine Coolant Temperature (ECT) Sensor 1 Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P0117 (6) | - | Engine Coolant Temperature (ECT) Sensor 1 Circuit Low Voltage | ON | ||||||||||||||||||
| P0118 (6) | - | Engine Coolant Temperature (ECT) Sensor 1 Circuit High Voltage | ON | ||||||||||||||||||
| P0122 (7) | - | Throttle Position (TP) Sensor A Circuit Low Voltage | ON | ||||||||||||||||||
| P0123 (7) | - | Throttle Position (TP) Sensor A Circuit High Voltage | ON | ||||||||||||||||||
| P0125 (86) | ◦ | Engine Coolant Temperature (ECT) Sensor 1 Malfunction/Slow Response | ON | ||||||||||||||||||
| P0128 (87) | ◦ | Cooling System Malfunction | ON | ||||||||||||||||||
| P0133 (61) | ◦ | Air Fuel Ratio (A/F) Sensor (Sensor 1) Malfunction/Slow Response | ON | ||||||||||||||||||
| P0134 (41) | ◦ | Air Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction | ON | ||||||||||||||||||
| P0135 (41) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) Heater Circuit Malfunction | ON | ||||||||||||||||||
| P0137 (63) | - | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Circuit Low Voltage | ON | ||||||||||||||||||
| P0138 (63) | - | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Circuit High Voltage | ON | ||||||||||||||||||
| P0139 (63) | ◦ | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Slow Response | ON | ||||||||||||||||||
| P0141 (65) | - | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Heater Circuit Malfunction | ON | ||||||||||||||||||
| P0171 (45) | ◦ | Fuel System Too Lean | ON | ||||||||||||||||||
| P0172 (45) | ◦ | Fuel System Too Rich | ON | ||||||||||||||||||
| P0222 7) | - | Throttle Position (TP) Sensor B Circuit Low Voltage | ON | ||||||||||||||||||
| P0223 (7) | - | Throttle Position (TP) Sensor B Circuit High Voltage | ON | ||||||||||||||||||
| P0300 (75) and any combination of the following: P0301 (71) P0302 (72) P0303 (73) P0304 (74) |
◦ | Random Misfire Detected | ON | ||||||||||||||||||
| P0301 (71) | ◦ | No. 1 Cylinder Misfire Detected | ON | ||||||||||||||||||
| P0302 (72) | ◦ | No. 2 Cylinder Misfire Detected | ON | ||||||||||||||||||
| P0303 (73) | ◦ | No. 3 Cylinder Misfire Detected | ON | ||||||||||||||||||
| P0304 (74) | ◦ | No. 4 Cylinder Misfire Detected | ON | ||||||||||||||||||
| P0325 (23) | - | Knock Sensor Circuit Malfunction | ON | ||||||||||||||||||
| P0335 (4) | - | Crankshaft Position (CKP) Sensor No Signal | ON | ||||||||||||||||||
| P0339 (4) | - | Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption | ON | ||||||||||||||||||
| P0351 (71) | - | No. 1 Cylinder Ignition Coil Circuit Malfunction | ON | ||||||||||||||||||
| P0352 (72) | - | No. 2 Cylinder Ignition Coil Circuit Malfunction | ON | ||||||||||||||||||
| P0353 (73) | - | No. 3 Cylinder Ignition Coil Circuit Malfunction | ON | ||||||||||||||||||
| P0354 (74) | - | No. 4 Cylinder Ignition Coil Circuit Malfunction | ON | ||||||||||||||||||
| P0365 (8) | - | Camshaft Position (CMP) Sensor No Signal | ON | ||||||||||||||||||
| P0369 (8) | - | Camshaft Position (CMP) Sensor Circuit Intermittent Interruption | ON | ||||||||||||||||||
| P0400 (80) | ◦ | Exhaust Gas Recirculation (EGR) System Leak Detected | ON | ||||||||||||||||||
| P0401 (80) | ◦ | Exhaust Gas Recirculation (EGR) Insufficient Flow | ON | ||||||||||||||||||
| P0404 (12) | ◦ | Exhaust Gas Recirculation (EGR) Valve Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P0406 (12) | - | Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P0420 (67) | ◦ | Catalyst System Efficiency Below Threshold | ON | ||||||||||||||||||
| P0443 (92) | - | Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction | ON | ||||||||||||||||||
| P0451 (91) | ◦ | Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P0452 (91) | - | Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage | ON | ||||||||||||||||||
| P0453 (91) | - | Fuel Tank Pressure (FTP) Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P0455 (90) | ◦ | Evaporative Emission (EVAP) System Large Leak Detected | ON | ||||||||||||||||||
| P0456 (90) | ◦ | Evaporative Emission (EVAP) System Very Small Leak Detected | ON | ||||||||||||||||||
| P0457 (90) | ◦ | Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing | ON | ||||||||||||||||||
| P0461 (121) | - | Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit Range/Performance Problem | OFF | ||||||||||||||||||
| P0462 (121) | - | Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit Low Voltage | OFF | ||||||||||||||||||
| P0463 (121) | - | Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit High Voltage | OFF | ||||||||||||||||||
| P0496 (92) | ◦ | Evaporative Emission (EVAP) System High Purge Flow Detected | ON | ||||||||||||||||||
| P0497 (90)(6) | ◦ | Evaporative Emission (EVAP) System Low Purge Flow Detected | ON | ||||||||||||||||||
| P0497 (90)(7) | ◦ | Evaporative Emission (EVAP) System Low Purge Flow Detected | ON | ||||||||||||||||||
| P0498 (117) | - | Evaporative Emission (EVAP) Canister Vent Shut Valve Circuit Low Voltage | ON | ||||||||||||||||||
| P0499 (117) | - | Evaporative Emission (EVAP) Canister Vent Shut Valve Circuit High Voltage | ON | ||||||||||||||||||
| P0506 (14) | ◦ | Idle Control System RPM Lower Than Expected | ON | ||||||||||||||||||
| P0507 (14) | ◦ | Idle Control System RPM Higher Than Expected | ON | ||||||||||||||||||
| P050A (167) | ◦ | Cold Start Idle Air Control System Performance Problem | ON | ||||||||||||||||||
| P050B (167) | ◦ | Cold Start Ignition Timing Control System Performance Problem | ON | ||||||||||||||||||
| P0522 (22) | - | Rocker Arm Oil Pressure Sensor (Engine Oil Pressure (EOP) Sensor) Circuit Low Voltage | ON | ||||||||||||||||||
| P0523 (22) | - | Rocker Arm Oil Pressure Sensor (Engine Oil Pressure (EOP) Sensor) Circuit High Voltage | ON | ||||||||||||||||||
| P0532 (191) | - | A/C Pressure Sensor Circuit Low Voltage | OFF | ||||||||||||||||||
| P0533 (191) | - | A/C Pressure Sensor Circuit High Voltage | OFF | ||||||||||||||||||
| P0562 (34) | - | Charging System Low Voltage | OFF | ||||||||||||||||||
| P0563 (34) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage | OFF | ||||||||||||||||||
| P0602 (196) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Programming Error | ON | ||||||||||||||||||
| P0603 (131)(2) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Control Module Keep Alive Memory (KAM) Error | ON | ||||||||||||||||||
| P0606 (-) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Processor Malfunction | ON | ||||||||||||||||||
| P060A (131)(2) | - | Powertrain Control Module (PCM) (A/T System) Internal Control Module Malfunction | ON | ||||||||||||||||||
| P062F (131)(7) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Control Module Keep Alive Memory (KAM) Error | ON | ||||||||||||||||||
| P0630 (139) | - | VIN Not Programmed or Mismatch | ON | ||||||||||||||||||
| P0685 (135) | ◦ | Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Control Circuit/Internal Circuit Malfunction | ON | ||||||||||||||||||
| P0720 (122)(2), (3) | - | Output Shaft (Countershaft) Speed Sensor Circuit Malfunction | ON | ||||||||||||||||||
| P0720 (122)(5) | - | Output Shaft (Countershaft) Speed Sensor Circuit Malfunction | ON | ||||||||||||||||||
| P1077 (106) | ◦ | Intake Manifold Tuning (IMT) Valve Stuck in High RPM Position | ON | ||||||||||||||||||
| P1078 (106) | ◦ | Intake Manifold Tuning (IMT) Valve Stuck in Low RPM Position | ON | ||||||||||||||||||
| P1109 (13) | - | Barometric Pressure (BARO) Sensor Circuit Out of Range High | ON | ||||||||||||||||||
| P1116 (86) | ◦ | Engine Coolant Temperature (ECT) Sensor 1 Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P1128 (5) | ◦ | Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected | ON | ||||||||||||||||||
| P1129 (5) | ◦ | Manifold Absolute Pressure (MAP) Sensor Signal Higher Than Expected | ON | ||||||||||||||||||
| P1157 (48) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) AFS Circuit High voltage | UN | ||||||||||||||||||
| P1172 (61) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) Circuit Out of Range High | ON | ||||||||||||||||||
| P1297 (20)(4) | - | Electrical Load Detector (ELD) Circuit Low Voltage | OFF | ||||||||||||||||||
| P1298 (20)(4) | - | Electrical Load Detector (ELD) Circuit High Voltage | OFF | ||||||||||||||||||
| P1454 (91) | ◦ | Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P145C (90)(7) | ◦ | Evaporative Emission (EVAP) System Purge Flow Malfunction | ON | ||||||||||||||||||
| P1549 (34) | - | Charging System High Voltage | OFF | ||||||||||||||||||
| P1658 (40) | - | Electronic Throttle Control System (ETCS) Control Relay ON Malfunction | ON | ||||||||||||||||||
| P1659 (40) | - | Electronic Throttle Control System (ETCS) Control Relay OFF Malfunction | ON | ||||||||||||||||||
| P1683 (40) | - | Throttle Valve Default Position Spring Performance Problem | ON | ||||||||||||||||||
| P1684 (40) | - | Throttle Valve Return Spring Performance Problem | ON | ||||||||||||||||||
| P16BB (116) | - | Alternator B Terminal Circuit Low Voltage | OFF | ||||||||||||||||||
| P16BC (116) | - | Alternator FR Terminal Circuit/IGP Circuit Low Voltage | OFF | ||||||||||||||||||
| P2101 (40) | - | Electronic Throttle Control System (ETCS) Malfunction | ON | ||||||||||||||||||
| P2118 (40) | - | Throttle Actuator Current Range/Performance Problem | ON | ||||||||||||||||||
| P2122 (37) | - | Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit Low Voltage | ON | ||||||||||||||||||
| P2123 (37) | - | Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit High Voltage | ON | ||||||||||||||||||
| P2127 (37) | - | Accelerator Pedal Position (APP) Sensor B (Throttle Position (TP) Sensor E) Circuit Low Voltage | ON | ||||||||||||||||||
| P2128 (37) | - | Accelerator Pedal Position (APP) Sensor B (Throttle Position (TP) Sensor E) Circuit High Voltage | ON | ||||||||||||||||||
| P2135 (7) | - | Throttle Position (TP) Sensor A/B Incorrect Voltage Correlation | ON | ||||||||||||||||||
| P2138 (37) | - | Accelerator Pedal Position (APP) Sensor A/B (Throttle Position (TP) Sensor D/E) Incorrect Voltage Correlation | ON | ||||||||||||||||||
| P2176 (40) | - | Throttle Actuator Control System Idle Position Not Learned | ON | ||||||||||||||||||
| P2183 (192) | ◦ | Engine Coolant Temperature (ECT) Sensor 2 Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P2184 (192) | - | Engine Coolant Temperature (ECT) Sensor 2 Circuit Low Voltage | ON | ||||||||||||||||||
| P2185 (192) | - | Engine Coolant Temperature (ECT) Sensor 2 Circuit High Voltage | ON | ||||||||||||||||||
| P2195 (48) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) Signal Stuck Lean | ON | ||||||||||||||||||
| P2227 (13) | ◦ | Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem | ON | ||||||||||||||||||
| P2228 (13) | - | Barometric Pressure (BARO) Sensor Circuit Low Voltage | ON | ||||||||||||||||||
| P2229 (13) | - | Barometric Pressure (BARO) Sensor Circuit High Voltage | ON | ||||||||||||||||||
| P2238 (48) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Circuit Low Voltage | ON | ||||||||||||||||||
| P2252 (48) | - | Air Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Circuit Low Voltage | ON | ||||||||||||||||||
| P2270 (63) | ◦ | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Circuit Signal Stuck Lean | ON | ||||||||||||||||||
| P2271 (63) | ◦ | Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Circuit Signal Stuck Rich | ON | ||||||||||||||||||
| P2413 (12) | ◦ | Exhaust Gas Recirculation (EGR) System Malfunction | ON | ||||||||||||||||||
| P2422 (117) | ◦ | Evaporative Emission (EVAP) Canister Vent Shut Valve Stuck Closed Malfunction | ON | ||||||||||||||||||
| P2610C (132) | - | Engine Control Module (ECM)/Powertrain Control Module (PCM) Ignition Off Internal Timer Malfunction | ON | ||||||||||||||||||
| P2646 (22) | - | VTEC System Stuck OFF | ON | ||||||||||||||||||
| P2647 (22) | - | VTEC System Stuck ON | ON | ||||||||||||||||||
| P2648 (21) | - | Rocker Arm Oil Control Solenoid Circuit Low Voltage | ON | ||||||||||||||||||
| P2649 (21) | - | Rocker Arm Oil Control Solenoid Circuit High Voltage | ON | ||||||||||||||||||
| P2A00 (61) | ◦ | Air Fuel Ratio (A/F) Sensor (Sensor 1) Circuit Range/Performance Problem | ON | ||||||||||||||||||
| U0028 (126)(9) | - | F-CAN Malfunction (BUS-OFF (Engine Control Module (ECM))) | ON | ||||||||||||||||||
| U0122 (126)(8) | - | F-CAN Malfunction (Engine Control Module (ECM)/Powertrain Control Module (PCM)-VSA Modulator-Control Unit) | OFF | ||||||||||||||||||
| U0131 (126)(9) | - | F-CAN Malfunction (Engine Control Module (ECM)-EPS Control Unit) | OFF | ||||||||||||||||||
| U0155 (126) | - | F-CAN Malfunction (Engine Control Module (ECM)/Powertrain Control Module (PCM)-Gauge Control Module) | ON | ||||||||||||||||||
| U0300 (131)(2) | - | PGM-FI System and A/T System Program Version Mismatch | ON | ||||||||||||||||||
|
NOTE:
The above DTCs are indicated when the PGM-FI system is selected with the HDS.
Some automatic transmission DTCs cause the MIL to come on. If the MIL is on and no DTCs are indicated in the PGM-FI system, select the A/T system, and check for automatic transmission DTCs.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.