OBDII Diagnostic Trouble Code (DTC) Lookup
On Board Diagnostics (OBD II) is an enhanced diagnostics monitor built into a vehicle’s Powertrain Control Module (PCM), as of 1996 all vehicles had to be OBD II compliant.
Diagnostic Trouble Code (DTC)
There hundreds of DTCs that can occur, which indicate that some subsection of the vehicle is experiencing a problem.
When one of these errors occurs, usually it will turn on the Malfunction Indicator or “check engine” Light on the dashboard.
By using a simple code reader plugged into the OBD II port, you can easily retrieve these DTCs, which will greatly reduce the time and effort required to isolate a particular issue with a vehicle.
Each OBD II Diagnostic Trouble Code has 5 characters, starting with a letter to indicate the general sub-system where the error occurred.
For example : P1209 is the Ford specific Powertrain code for an Injection Control Pressure (ICP) system fault, with the probable cause being the Injection Pressure Regulator (IPR) valve being stuck.
- PXXXX – Powertrain
- BXXXX – Body
- CXXXX – Chassis
- UXXXX – Network
Some more example OBDII diagnostic trouble codes are listed below:
| Code | Condition Description | Probable Causes |
| P0107 | Barometric pressure sensor circuit low input | PCM’s internal barometric sensor |
| P0108 | Barometric pressure sensor circuit high input | PCM’s internal barometric sensor |
| P0112 | Intake air temp. sensor circuit low input | Grounded circuit, biased sensor, PCM |
| P0113 | Intake air temp. sensor circuit high input | Open circuit, biased sensor, PCM, short to 5v |
| P0122 | Accelerator pedal sensor circuit low input | Grounded circuit, biased sensor, PCM |
| P0123 | Accelerator pedal sensor circuit high input | Open circuit, biased sensor, PCM, short to 5v |
| P0197 | Engine oil temp. sensor circuit low input | Grounded circuit, biased sensor, PCM |
| P0198 | Engine oil temp. sensor circuit high input | Open circuit, biased sensor, PCM, short to 5v |
| P0220 | Throttle switch B circuit malfunction | Short/open circuit, switch failure, operator, PCM |
| P0221 | Throttle switch B circuit performance | Failed pedal assembly |
| P0230 | Fuel pump relay driver failure | Open FP relay, blown fuse, open/grounded circuit |
| P0231 | Fuel pump circuit failure | Fuse, relay, inertia switch, fuel pump, open/short circuit |
| P0232 | Fuel pump circuit failure | Relay failure, short circuit, pump failure |
| P0236 | Turbo boost sensor A circuit performance | Restricted inlet/exhaust/supply hose, missing hose |
| P0237 | Turbo boost sensor A circuit low input | Circuit open, short to ground, MAP sensor |
| P0238 | Turbo boost sensor A circuit low high | Circuit short to power, MAP sensor |
| P0261 | Injector circuit low Cylinder 1 | Harness short to ground |
| P0262 | Injector circuit high Cylinder 1 | Miswired connector or harness |
| P0263 | Cylinder 1 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0264 | Injector circuit low Cylinder 2 | Harness short to ground |
| P0265 | Injector circuit high Cylinder 2 | Miswired connector or harness |
| P0266 | Cylinder 2 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0267 | Injector circuit low Cylinder 3 | Harness short to ground |
| P0268 | Injector circuit high Cylinder 3 | Miswired connector or harness |
| P0269 | Cylinder 3 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0270 | Injector circuit low Cylinder 4 | Harness short to ground |
| P0271 | Injector circuit high Cylinder 4 | Miswired connector or harness |
| P0272 | Cylinder 4 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0273 | Injector circuit low Cylinder 5 | Harness short to ground |
| P0274 | Injector circuit high Cylinder 5 | Miswired connector or harness |
| P0275 | Cylinder 5 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0276 | Injector circuit low Cylinder 6 | Harness short to ground |
| P0277 | Injector circuit high Cylinder 6 | Miswired connector or harness |
| P0278 | Cylinder 6 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0279 | Injector circuit low Cylinder 7 | Harness short to ground |
| P0280 | Injector circuit high Cylinder 7 | Miswired connector or harness |
| P0281 | Cylinder 7 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0282 | Injector circuit low Cylinder 8 | Harness short to ground |
| P0283 | Injector circuit high Cylinder 8 | Miswired connector or harness |
| P0284 | Cylinder 8 contribution/balance fault | Power cylinder, valve train or injector problem, circuit |
| P0301 | Fault cylinder 1 Misfire detected | Mechanical engine failure |
| P0302 | Fault cylinder 2 Misfire detected | Mechanical engine failure |
| P0303 | Fault cylinder 3 Misfire detected | Mechanical engine failure |
| P0304 | Fault cylinder 4 Misfire detected | Mechanical engine failure |
| P0305 | Fault cylinder 5 Misfire detected | Mechanical engine failure |
| P0306 | Fault cylinder 6 Misfire detected | Mechanical engine failure |
| P0307 | Fault cylinder 7 Misfire detected | Mechanical engine failure |
| P0308 | Fault cylinder 8 Misfire detected | Mechanical engine failure |
| P0340 | Camshaft position sensor ckt. malfunction | Open/grounded circuit, sensor fault, short to power |
| P0341 | Camshaft position sensor ckt. performance | Harness routing, charging circuit, sensor |
| P0344 | Camshaft position sensor ckt. intermittent | Harness routing, charging ckt., sensor, int. ckt., improper gap |
| P0380 | Glow plug circuit malfunction | Open/grounded ckt., solenoid open/shorted, failed PCM |
| P0381 | Glow plug indicator circuit malfunction | Open/grounded circuit, lamp open, failed PCM |
| P0460 | Fuel level sensor circuit malfunction | Open/short circuit, cluster, tank unit, open case GND |
| P0470 | Exhaust back pressure sensor circuit malfunction | Biased sensor, open signal return |
| P0471 | Exhaust back pressure sensor circuit performance | Plugged, stuck or leaking hose |
| P0472 | Exhaust back pressure sensor circuit low input | Open/grounded circuit, biased sensor, PCM |
| P0473 | Exhaust back pressure sensor circuit high input | Circuit shorted to 5v, biased sensor, PCM |
| P0475 | Exhaust pressure control valve malfunction | Open/grounded ckt., solenoid open/shorted, failed PCM |
| P0476 | Exhaust pressure control valve performance | Failed/stuck EPR control, EBP fault, EPR circuit |
| P0478 | Exhaust pressure control valve high input | Plugged sensor line, stuck butterfly, restricted exhaust |
| P0500 | Vehicle speed sensor malfunction | Sensor, circuit, PCM, PSOM, TR failure, low trans. fluid |
| P0503 | Vehicle speed sensor noisy | Harness routing, sensor |
| P0541 | Manifold intake air heater… | Open/short circuit |
| P0542 | Manifold intake air heater… | Grounded circuit |
| P0560 | System voltage malfunction | Charging system problem/load, glow plugs still enabled |
| P0562 | System voltage low | Low sys. voltage, charging sys., internal PCM failure |
| P0563 | System voltage high | High sys., voltage, charging sys., internal PCM failure |
| P0565 | Cruise “On” signal malfunction | Open or short circuit, switch failure, PCM failure or failed to activate switch during KOER switch test |
| P0566 | Cruise “Off” signal malfunction | Open or short circuit, switch failure, PCM failure or failed to activate switch during KOER switch test |
| P0567 | Cruise “Resume” signal malfunction | Open or short circuit, switch failure, PCM failure or failed to activate switch during KOER switch test |
| P0568 | Cruise “Set” signal malfunction | Open or short circuit, switch failure, PCM failure or failed to activate switch during KOER switch test |
| P0569 | Cruise “Coast” signal malfunction | Open or short circuit, switch failure, PCM failure or failed to activate switch during KOER switch test |
| P0571 | Brake switch A circuit malfunction | Cruise control codes will be set on every switch test on vehicles not equipped with cruise control |
| P0603 | Internal control module KAM error | Open PCM pin, disconnect B+, faulty PCM |
| P0605 | Internal control module ROM error | Internal PCM failure |
| P0606 | PCM processor fault | Internal PCM failure |
| P0640 | Manifold intake air heater… | Circuit open or shorted to ground |
| P0670 | Glow plug control circuit malfunction | Open/grounded circuit, failed GPCM, failed PCM |
| P0671 | Glow plug #1 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0672 | Glow plug #2 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0673 | Glow plug #3 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0674 | Glow plug #4 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0675 | Glow plug #5 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0676 | Glow plug #6 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0677 | Glow plug #7 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0678 | Glow plug #8 circuit failure | Circuit/connector failure, failed glow plug, failed GPCM, PCM |
| P0683 | Glow plug diagnostic signal communication fault | Circuit/connector failure, failed GPCM, PCM |
| P0703 | Brake switch B circuit malfunction | Open/short circuit, switch, PCM, failed to activate switch during KOER switch test |
| P0704 | Clutch switch input circuit malfunction; F650-F750 with Allison AT545: neutral switch | Open/short circuit, switch, PCM, failed to activate switch during KOER switch test |
| P0705 | TR sensor circuit malfunction | Resistance in circuit, faulty sensor, PCM |
| P0707 | TR sensor circuit low input | Open in circuit, biased sensor, PCM |
| P0708 | TR sensor circuit high input | Open in circuit, biased sensor, PCM, short to power |
| P0712 | Trans. fluid temp. sensor ckt. low input | Short to ground, biased sensor, PCM |
| P0713 | Trans. fluid temp. sensor ckt. high input | Open in circuit, biased sensor, PCM, short to power |
| P0715 | TSS sensor circuit malfunction | Short/open circuit, sensor, PCM |
| P0717 | TSS intermittent failure | Short/open circuit, sensor, PCM |
| P0718 | Noisy TSS | Erratic signal, sensor, intermittent circuit |
| P0720 | OSS sensor circuit malfunction | Short/open circuit, sensor, PCM |
| P0721 | Noisy OSS | Erratic signal, sensor, intermittent circuit |
| P0722 | OSS intermittent failure | Short/open circuit, sensor, PCM |
| P0732 | Gear 2 incorrect ratio | Mechanical/hydraulic failure, 4×4 switch failure |
| P0733 | Gear 3 incorrect ratio | Mechanical/hydraulic failure, 4×4 switch failure |
| P0741 | Torque converter clutch ckt. performance | Circuit failure, faulty solenoid, PCM |
| P0743 | Torque converter clutch system electrical | Faulty solenoid, circuit, PCM |
| P0750 | Shift solenoid A malfunction | Circuit failure, faulty solenoid, PCM |
| P0755 | Shift solenoid B malfunction | Circuit failure, faulty solenoid, PCM |
| P0781 | 1-2 Shift malfunction | Circuit failure, faulty solenoid, faulty clutch, PCM |
| P0782 | 2-3 Shift malfunction | Circuit failure, faulty solenoid, faulty clutch, PCM |
| P0783 | 3-4 Shift malfunction | Circuit failure, faulty solenoid, faulty clutch, PCM |
| P1000 | OBDII monitor status | OBDII monitors/drive cycle incomplete |
| P1105 | Dual alternator upper fault (monitor) | Circuit failure, alternator failure, PCM |
| P1106 | Dual alternator lower fault (control) | Circuit failure, alternator failure, PCM |
| P1107 | Dual alternator lower circuit malf. (control) | Circuit failure, alternator failure, PCM |
| P1108 | Dual alternator BATT lamp ckt. malf. | Open/short circuit, lamp, fuse, PCM |
| P1118 | Manifold air temp sensor out of range low | Short to GND MAT circuit, MAT sensor |
| P1119 | Manifold air temp sensor out of range high | Open/short to PWR circuit, MAT sensor |
| P1139 | Water in fuel lamp circuit malfunction | WIF lamp, circuit failure, fuse, PCM |
| P1140 | Water in fuel condition | Water in fuel, grounded circuit, shorted sensor, PCM |
| P1184 | Engine oil temp out of self test range | Engine too cold/hot, leaking thermostat, ckt., sensor |
| P1209 | ICP system fault | IPR valve stuck |
| P1210 | ICP above expected level | ICP sensor, open signal return |
| P1211 | ICP pressure above/below desired | IPR valve failed, stuck, or shorted to ground |
| P1212 | ICP voltage not at expected level | Biased sensor or ckt., open signal return, low oil in reservoir |
| P1218 | CID stuck high | CID circuit open, probably intermittent |
| P1219 | CID stuck low | CID circuit short to ground, probably intermittent |
| P1247 | Turbo boost pressure low | MAP hose, sensor, EBP sys, intake leaks, turbo |
| P1248 | Turbo boost pressure not detected | MAP hose, sensor, EBP sys, intake leaks, turbo |
| P1249 | Waste gate steady state failure | GND short, plugged hose/port, solenoid, actuator |
| P1260 | Electronic positive anti-theft system failure | Refer to appropriate workshop manual. |
| P1261- P1268 | High to low side short cyl. # 1-8 | Short circuit, shorted injector, failed IDM |
| P1271- P1278 | High to low side open cyl. # 1-8 | Open circuit, open injector, failed IDM |
| P1280 | ICP circuit out of range low | Open/grounded circuit, biased sensor, PCM |
| P1281 | ICP circuit out of range high | Circuit shorted to 5v, biased sensor, PCM |
| P1282 | Excessive ICP pressure | Faulty IPR regulator (sticking), IPR short to ground |
| P1283 | IPR circuit failure | Open/grounded circuit, stuck IPR, loose connection |
| P1284 | ICP failure aborts KOER CCT test | See codes P1280, P1281, P1282, P1283, P1211 |
| P1291 | High side # 1 (right) short to grd. or B+ | Short circuit, faulty IDM |
| P1292 | High side # 2 (left) short to grd. or B+ | Short circuit, faulty IDM |
| P1293 | High side open bank No. 1 (right) | Open circuit, faulty IDM |
| P1294 | High side open bank No. 2 (left) | Open circuit, faulty IDM |
| P1295 | Multiple faults on bank No. 1 (right) | Miswired connector or harness, short to ground |
| P1296 | Multiple faults on bank No. 2 (left) | Miswired connector or harness, short to ground |
| P1297 | High sides shorted together | Shorted wires, faulty IDM |
| P1298 | IDM failure | Internal IDM failure |
| P1316 | Injector circuit/IDM codes detected | Injector circuit failure/IDM codes detected |
| P1391 | Glow plug circuit low input, bank #1 (right) | Open/short/miswired circuit, faulty relay, glow plugs |
| P1393 | Glow plug circuit low input, bank #2 (left) | Open/short/miswired circuit, faulty relay, glow plugs |
| P1395 | Glow plug monitor fault, bank #1 | One or more glow plugs failed or circuit fault |
| P1396 | Glow plug monitor fault, bank #2 | One or more glow plugs failed or circuit fault |
| P1397 | System voltage out of self test range | Voltage too high or low for glow plug monitor test |
| P1464 | A/C on during KOER CCT test | Operator error, A/C circuit shorted to power |
| P1501 | Vehicle moved during testing | Operator error |
| P1502 | Invalid test APCM functioning | APCM active while KOER test is running |
| P1531 | Invalid test accelerator pedal movement | Accelerator moved during KOER on-demand or CCT test |
| P1536 | Parking brake applied fail | Circuit, switch, PCM, failed to activate switch KOER |
| P1660 | OCC signal high | High system voltage, internal PCM fault |
| P1661 | OCC signal low | Low system voltage, internal PCM fault |
| P1662 | IDM EN circuit failure | Open relay, blown fuse, open/grounded circuit |
| P1663 | FDCS circuit failure | Open/grounded circuit, faulty IDM |
| P1667 | CID circuit failure | Open/grounded circuit, faulty IDM |
| P1668 | PCM/IDM diag. communication error | Open/shorted EF or FDCS wire, open IDM grd. |
| P1670 | EF signal not detected | Open/shorted EF circuit |
| P1690 | Waste gate failure | WGC circuit or solenoid, PCM |
| P1702 | TRS sensor intermittent circuit malfunction | Sensor, wiring, PCM, mechanical alignment |
| P1704 | Digital TRS failed to transition state | Sensor, wiring, PCM, mechanical alignment |
| P1705 | TR sensor out of self-test range | Operator error, circuit failure, faulty sensor, PCM |
| P1711 | TFT sensor out of self-test range | Circuit failure, faulty sensor, PCM |
| P1713 | TFT stuck in range low below 50F | Sensor, circuit, PCM |
| P1714 | Shift solenoid 1 inductive | Circuit, solenoid, PCM |
| P1715 | Shift solenoid 2 inductive | Circuit, solenoid, PCM |
| P1718 | TFT stuck in range high above 250F | Sensor, circuit, PCM |
| P1728 | Transmission slip error | Solenoid failure or mechanical failure |
| P1729 | 4×4 Low switch error | Circuit failure, faulty switch, PCM |
| P1744 | Converter not functioning | Converter solenoid/hydraulic/mechanical failure |
| P1746 | EPC solenoid open circuit | Open circuit, faulty solenoid, PCM |
| P1747 | EPC solenoid short circuit | Short circuit, faulty solenoid, PCM shorted to ground |
| P1754 | Coast clutch solenoid ckt. malfunction | Circuit failure, faulty solenoid, PCM |
| P1760 | EPC solenoid short intermittent | Switch not detected during self test, circuit, switch |
| P1780 | TCS circuit of out self-test range | Circuit, switch, PCM, failed to activate switch KOER |
| P1781 | 4×4 Low circuit out of self-test range | Operator error, short to ground, PCM |
| P1783 | Transmission overtemperature condition | Internal trans. failure, circuit failure, sensor, PCM |
| P1902 | Kickdown solenoid relay control circuit failure | Blown fuse, failed relay, open control circuit, faulty PCM, faulty wiring |
| P1903 | Kickdown solenoid circuit low voltage | Blown fuse, failed relay, open control circuit, faulty PCM |
| P1904 | Kickdown solenoid circuit high voltage | Blown fuse, failed relay, open control circuit, faulty PCM, open in ASMM (circuit #175) |
| P2262 | Turbo/Super Charger Boost Pressure Not Detected – Mechanical | – Faulty Injection Control Pressure (ICP) sensor – Injection Control Pressure (ICP) sensor harness is open or shorted- Injection Control Pressure (ICP) sensor circuit poor electrical connection- EGR system fault- Engine mechanical condition |