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 MANUALSHONDA2008RIDGELINE RTLREPAIR AND DIAGNOSISENGINE MECHANICALFUEL SYSTEMFUEL AND EMISSIONS SYSTEMSDTC TROUBLESHOOTING INDEX
2008 Honda Ridgeline RTL
DTC Troubleshooting Index
2008 Honda Ridgeline RTLSECTION DTC Troubleshooting Index
DTC TROUBLESHOOTING CHART (1 OF 4)
| DTC (MIL indication(1)) | Temporary DTC | Detection Item | MIL | ||
|---|---|---|---|---|---|
| P0107 (3) | - | Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | ON | ||
| P0108 (3) | - | Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage | ON | ||
| P0111 (10) | P0111 | 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) | P0116 | Engine Coolant Temperature (ECT) Sensor 1 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) | P0125 | Engine Coolant Temperature (ECT) Sensor 1 Malfunction/Slow Response | ON | ||
| P0128 (87) | P0128 | Cooling System Malfunction | ON | ||
| P0133 (157) | P0133 | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response | ON | ||
| P0134 (151) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Heater System Malfunction | ON | ||
| P0135 (151) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction | ON | ||
| P0137 (161) | - | Rear Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 1, Sensor 2)) Circuit Low Voltage | ON | ||
| P0138 (161) | - | Rear Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 1, Sensor 2)) Circuit High Voltage | ON | ||
| P0139 (161) | P0139 | Rear Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 1, Sensor 2)) Circuit Slow Response | ON | ||
| P0141 (163) | - | Rear Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 1, Sensor 2)) Heater Circuit Malfunction | ON | ||
| P0153 (158) | P0153 | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response | ON | ||
| P0154 (152) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction | ON | ||
| P0155 (152) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit, Malfunction | ON | ||
| P0157 (162) | P0157 | Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Circuit Low Voltage | ON | ||
| P0158 (162) | P0158 | Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Circuit High Voltage | ON | ||
| P0159 (162) | P0159 | Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Circuit Slow Response | ON | ||
| P0161 (164) | - | Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Heater Circuit Malfunction | ON | ||
| P0171 (153) | P0171 | Rear Bank (Bank 1) Fuel System Too Lean | ON | ||
| P0172 (153) | P0172 | Rear Bank (Bank 1) Fuel System Too Rich | ON | ||
| P0174 (154) | P0174 | Front Bank (Bank 2) Fuel System Too Lean | ON | ||
| P0175 (154) | P0175 | Front Bank (Bank 2) 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 (77) and some of P0301 (71), P0302 (72), P0303 (73), P0304 (74), P0305 (75), P0306 (76) | P0300 and some of P0301, P0302, P0303, P0304, P0305, P0306 | Random Misfire Detected | ON | ||
| P0301 (71) | P0301 | No. 1 Cylinder Misfire Detected | ON | ||
| P0302 (72) | P0302 | No. 2 Cylinder Misfire Detected | ON | ||
| P0303 (73) | P0303 | No. 3 Cylinder Misfire Detected | ON | ||
| P0304 (74) | P0304 | No. 4 Cylinder Misfire Detected | ON | ||
| P0305 (75) | P0305 | No. 5 Cylinder Misfire Detected | ON | ||
| P0306 (76) | P0306 | No. 6 Cylinder Misfire Detected | ON | ||
| P0325 (23) | - | Knock Sensor Circuit Malfunction | ON | ||
|
|||||
NOTE:
These DTCs are indicated when the PGM-FI system is selected in 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.
DTC TROUBLESHOOTING CHART (2 OF 4)
| DTC (MIL indication(1)) | Temporary DTC | Detection Item | MIL | ||||
|---|---|---|---|---|---|---|---|
| P0335 (4) | - | Crankshaft Position (CKP) Sensor A No Signal | ON | ||||
| P0339 (4) | - | Crankshaft Position (CKP) Sensor A Intermittent Interruption | ON | ||||
| P0340 (9) | - | Camshaft Position (CMP) Sensor No Signal | ON | ||||
| P0344 (9) | - | Camshaft Position (CMP) Sensor Intermittent Interruption | ON | ||||
| P0385 (54) | - | Crankshaft Position (CKP) Sensor B No Signal | ON | ||||
| P0389 (54) | - | Crankshaft Position (CKP) Sensor B Intermittent Interruption | ON | ||||
| P0401 (80) | P0401 | Exhaust Gas Recirculation (EGR) Insufficient Flow | ON | ||||
| P040 (12) | P0404 | Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Problem | ON | ||||
| P0406 (12) | - | Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage | ON | ||||
| P0420 (165) | P0420 | Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) | ON | ||||
| P0430 (166) | P0430 | Front Bank Catalyst System Efficiency Below Threshold (Bank 2) | ON | ||||
| P0443 (92) | - | Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction | ON | ||||
| P0451 (91) | P0451 | Fuel Tank Pressure (FTP) Sensor 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) | P0455 | Evaporative Emission (EVAP) System Very Large Leak Detected | ON | ||||
| P0456 (90) | P0456 | Evaporative Emission (EVAP) System Very Small Leak Detected | ON | ||||
| P0457 (90) | P0457 | Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing | ON | ||||
| P0461 (121) | - | Fuel Level Sensor (Fuel Gauge Sending Unit) 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) | P0496 | Evaporative Emission (EVAP) System High Purge Flow | ON | ||||
| P0497 (90) | P0497 | Evaporative Emission (EVAP) System Low Purge Flow | ON | ||||
| P0498 (117) | - | Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit Low Voltage | ON | ||||
| P0499 (117) | - | Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit High Voltage | ON | ||||
| P0506 (14) | P0506 | Idle Control System RPM Lower than Expected | ON | ||||
| P0507 (14) | P0507 | Idle Control System RPM Higher than Expected | ON | ||||
| P0562 (34) | - | Charging System Low Voltage | OFF | ||||
| P0563 (34) | - | Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage | OFF | ||||
| P0602 (196) | - | Powertrain Control Module (PCM) Programming Error | OFF | ||||
| P0603 (131) | - | Powertrain Control Module (PCM) Internal Circuit Malfunction (Keep Alive Memory (KAM) Error) | ON | ||||
| P0607 (131) | - | Lost Communication with Electronic Throttle Control System (ETCS) | ON | ||||
| P061F (132) | - | Electronic Throttle Control System (ETCS) Malfunction | ON | ||||
| P0630 (139) | - | VIN Not Programmed or Mismatch | ON | ||||
| P0641 (133) | - | Sensor Reference Voltage A Malfunction | ON | ||||
| P0685 (135) | P0685 | Powertrain Control Module (PCM) Internal Circuit Malfunction (Power Control Circuit) | ON | ||||
| P0700 (70)(2) | - | Automatic Transaxle System Malfunction | ON | ||||
| P0700 (70) | - | Automatic Transaxle System Malfunction | OFF | ||||
|
|||||||
NOTE:
These DTCs are indicated when the PGM-FI system is selected in 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.
DTC TROUBLESHOOTING CHART (3 OF 4)
| DTC (MIL indication(1)) | Temporary DTC | Detection Item | MIL | ||
|---|---|---|---|---|---|
| P1077 (106) | P1077 | Intake Manifold Tuning (IMT) Valve Stuck in High RPM Position | ON | ||
| P1078 (106) | P1078 | 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) | P1116 | Engine Coolant Temperature (ECT) Sensor 1 Performance Problem | ON | ||
| P1128 (5) | P1128 | Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected | ON | ||
| P1129 (5) | P1129 | Manifold Absolute Pressure (MAP) Sensor Signal Higher Than Expected | ON | ||
| P1172 (157) | - | Rear Air Fuel Ratio (A/F) Sensor Circuit Out of Range High (Bank 1) | ON | ||
| P1174 (158) | - | Front Air Fuel Ratio (A/F) Sensor Circuit Out of Range High (Bank 2) | ON | ||
| P1297 (20) | - | Electrical Load Detector (ELD) Circuit Low Voltage | OFF | ||
| P1298 (20) | - | Electrical Load Detector (ELD) Circuit High Voltage | OFF | ||
| P1454 (91) | P1454 | Fuel Tank Pressure (FTP) Sensor Range/Performance Problem | 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 Sensor D) Circuit Low Voltage | ON | ||
| P2123 (37) | - | Accelerator Pedal Position (APP) Sensor A (Throttle Position Sensor D) Circuit High Voltage | ON | ||
| P2127 (37) | - | Accelerator Pedal Position (APP) Sensor B (Throttle Position Sensor E) Circuit Low Voltage | ON | ||
| P2128 (37) | - | Accelerator Pedal Position (APP) Sensor B (Throttle Position Sensor E) Circuit High Voltage | ON | ||
| P2135 (7) | - | Throttle Position (TP) Sensor A/B Voltage Incorrect Correlation | ON | ||
| P2138 (37) | - | Accelerator Pedal Position (APP) Sensor A/B (Throttle Position Sensor D/E) Incorrect Voltage Correlation | ON | ||
| P2176 (40) | - | Throttle Actuator Control System Idle Position Not Learned | ON | ||
| P2183 (192) | P2183 | 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 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Signal Stuck Lean | ON | ||
| P2197 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean | ON | ||
| P2227 (13) | P2227 | Barometric Pressure (BARO) Sensor Range/Performance Problem | ON | ||
| P2228 (13) | - | Barometric Pressure (BARO) Sensor Circuit Low Voltage | ON | ||
| P2229 (13) | - | Barometric Pressure (BARO) Sensor Circuit High Voltage | ON | ||
| P2237 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line High Voltage | ON | ||
| P2238 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line Low Voltage | ON | ||
| P2240 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line High Voltage | ON | ||
| P2241 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line Low Voltage | ON | ||
| P2243 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line High Voltage | ON | ||
| P2245 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line Low Voltage | ON | ||
| P2247 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line High Voltage | ON | ||
| P2249 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line Low Voltage | ON | ||
|
|||||
NOTE:
These DTCs are indicated when the PGM-FI system is selected in 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.
DTC TROUBLESHOOTING CHART (4 OF 4)
| DTC (MIL indication(1)) | Temporary DTC | Detection Item | MIL | ||
|---|---|---|---|---|---|
| P2251 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage | ON | ||
| P2252 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line Low Voltage | ON | ||
| P2254 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line High Voltage | ON | ||
| P2255 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line Low Voltage | ON | ||
| P2270 (161) | P2270 | Rear Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Signal Stuck Lean (Bank 1) | ON | ||
| P2271 (161) | P2271 | Rear Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Signal Stuck Rich (Bank 1) | ON | ||
| P2272 (162) | P2272 | Front Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Signal Stuck Lean (Bank 2) | ON | ||
| P2273 (162) | P2273 | Front Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Signal Stuck Rich (Bank 2) | ON | ||
| P2279 (109) | P2279 | Intake Air System Leak | ON | ||
| P2413 (12) | P2413 | Exhaust Gas Recirculation (EGR) System Malfunction | ON | ||
| P2422 (117) | P2422 | Evaporative Emission (EVAP) Canister Vent Shut Valve Close Malfunction | ON | ||
| P2610 (132) | - | Powertrain Control Module (PCM) Ignition Off Internal Timer Performance Problem | ON | ||
| P2627 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage | ON | ||
| P2628 (155) | - | Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage | ON | ||
| P2630 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage | ON | ||
| P2631 (156) | - | Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage | ON | ||
| P2646 (22) | - | VTEC Oil Pressure Switch Circuit Low Voltage | ON | ||
| P2647 (22) | - | VTEC Oil Pressure Switch Circuit High Voltage | ON | ||
| P2648 (21) | - | VTEC Solenoid Valve Circuit Low Voltage | ON | ||
| P2649 (21) | - | VTEC Solenoid Valve Circuit High Voltage | ON | ||
| P2A00 (157) | P2A00 | Rear A/F Sensor (Bank 1, Sensor 1) Range/Performance Problem | ON | ||
| P2A03 (158) | P2A03 | Front A/F Sensor (Bank 2, Sensor 1) Range/Performance Problem | ON | ||
| U0073 (126) | - | F-CAN Malfunction (BUS-OFF) | OFF | ||
| U0114 (126) | - | F-CAN Malfunction (VTM-4 Control Unit-PCM) | OFF | ||
| U0122 (126) | - | F-CAN Malfunction (VSA-PCM) | OFF | ||
| U0155 (126) | - | F-CAN Malfunction (Gauge Control Module-PCM) | OFF | ||
|
|||||
NOTE:
These following DTCs are indicated when the PGM-FI system is selected in 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.