OBDII Isuzu Code Definitions.

Be sure to double check the codes. Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles.

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Isuzu Codes
Trouble Code Fault Location Probable Cause
P1085High Pressure Fuel Pump Performance
P1093Fuel Rail Pressure Too Low
P1101Mass air flow (MAF) and manifold absolute pressure (MAP) sensors – circuit malfunctionWiring, MAF, MAP, ECM
P1106Manifold absolute pressure (MAP) sensor – circuiUintermittent voltage highWiring, MAP sensor, mechanical fault, ECM
P1107Manifold absolute pressure (MAP) sensor – circuiUintermittent voltage lowWiring, MAP sensor, mechanical fault, ECM
P1108Barometric pressure (BARO) sensor - circuit/voltage highECM
P1111Intake air temperature (IAT) sensor – circuit/   intermittent voltage highWiring, IAT sensor, ECM
P1112Intake air temperature (IAT) sensor – circuiU   intermittent voltage lowWiring, IAT sensor, ECM
P1114Engine coolant temperature (ECT) sensor- circuiUintermittent voltage lowWiring, ECT sensor, ECM
P1115Engine coolant temperature (ECT) sensor- circuit/intermittent voltage highWiring, ECT sensor, ECM
P1120Throttle motor position sensor 1 – circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1121Throttle position (TP) sensor – circuit/   intermittent voltage highWiring, TP sensor, mechanical fault, ECM
P1122Throttle position (TP) sensor – circuit/   intermittent voltage lowWiring, TP sensor, mechanical fault, ECM
P1125Throttle position (TP) motor - fail safe modeWiring, TP sensor, TP motor, mechanical fault, ECM
P1128Manifold absolute pressure (MAP) sensor - pressure lower than expectedMAP sensor
P1129Manifold absolute pressure (MAP) sensor - pressure higher than expectedMAP sensor
P1133Heated oxygen sensor (HO2S) - RH front (6 cyl) - insufficient switchingWiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1134Heated oxygen sensor (HO2S) - RH front - slow operationWiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1137Heated oxygen sensor (H02S) 1/2- voltage incorrectWiring, exhaust system leaking, H02S
P1138Heated oxygen sensor (H02S) 2 – voltage highWiring, H02S
P1153Heated oxygen sensor (HO2S) - LH front - insufficient switchingWiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1154Heated oxygen sensor (HO2S) - LH front - slow operationWiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1167Fuel trim, bank 1 – mixture too rich during decelerationInjectors, fuel pump, fuel pressure, ECM
P1169Fuel trim, bank 2 – mixture too rich during decelerationInjectors, fuel pump, fuel pressure, ECM
P1171Fuel trim – mixture too lean during accelerationWiring, H02/H02S, mechanical fault, fuel system, fuel pressure, ECM
P1174Fuel Trim Cylinder Balance
P1201Injector Circuit Open / Shorted Cylinder #1
P1202Injector Circuit Open / Shorted Cylinder #2
P1203Injector Circuit Open / Shorted Cylinder #3
P1204Injector Circuit Open / Shorted Cylinder #4
P1205Injector Circuit Open / Shorted Cylinder #5
P1206Injector Circuit Open / Shorted Cylinder #6
P1220Throttle motor position sensor 2 - circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1220   .Throttle motor position sensor 2 – circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1221Throttle motor position sensor 1/2 – signal variationWiring, throttle control unit, ECM
P1237High Fuel Pressure Regulator Circuit Shorted To Ground
P1238High Fuel Pressure Regulator Circuit Shorted To Battery
P1239High Fuel Pressure System Fault
P1240High Fuel Pressure Regulator Circuit Open
P1241High Fuel Pressure Regulator Circuit Low Voltage
P1242High Fuel Pressure Regulator Circuit High Voltage
P1246Low Fuel Pressure Regulator Circuit Malfunction
P1247Low Fuel Pressure Regulator Circuit Low Voltage
P1248Fuel Pump Relay Control Circuit Open
P1249Low Fuel Pressure Sensor Circuit High Voltage
P1250Fuel Pump Relay Control Circuit Shorted To Ground
P1253VTEC system - malfunctionWiring, VTEC solenoid, ECM
P1258Engine coolant – excessive temperatureWiring, engine coolant blower motor, mechanical fault, ECM
P1259VTEC system - malfunctionWiring, VTEC solenoid/pressure switch, ECM
P1271Accelerator pedal position (APP) sensor 1/2- signal variationWiring, APP sensor, ECM
P1272Accelerator pedal position (APP) sensor 2/3 – signal variationWiring, APP sensor, ECM
P1273Accelerator pedal position (APP) sensor 1/3- signal variationWiring, APP sensor, ECM
P1275Accelerator pedal position (APP) sensor 1 – circuit malfunctionWiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1280Accelerator pedal position (APP) sensor 2 – circuit malfunctionWiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1285Accelerator pedal position (APP) sensor 3 – circuit malfunctionWiring, APP sensor, ECM
P1290Throttle position (TP) motor -forced idle modeWiring, APP sensor, TP motor, mechanical fault, ECM
P1293High Side Open Bank No. 1
P1295Throttle position (TP) motor – power management modeWiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1297Electrical load sensor - circuit/voltage lowWiring, electrical load sensor, ECM
P1298Electrical load sensor - circuit/voltage highWiring, electrical load sensor, ECM
P1299Throttle position (TP) motor – forced engine shut down modeWiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1300 – P1399 (Ignition system or misfire)
P1300Random misfireIgnition/fuel/EGR system, MAP sensor, IAC valve
P1310Ignition control module (ICM) – diagnosisWiring, ignition coil(s), ICM, ECM
P1311Ignition control module (ICM) – ignition coil secondary coil signal, circuit 1Wiring, ignition coil(s), ICM, ECM
P1312Ignition control module (ICM) – ignition coil secondary coil signal, circuit 2Wiring, ignition coil(s), ICM, ECM
P1326Ignition control module (ICM) – combustion quality input signalWiring, ignition coil(s), ICM, ECM
P1336Crankshaft position (CKP) sensor – signal variationWiring, CKP sensor, mechanical fault, learning procedure not performed, ECM
P1340Ignition control module (ICM) – cylinder identification/syncronizationWiring, ignition coil(s), ICM, ECM
P1345CKP/CMP signals – signal malfunctionWiring, CKP/CMP sensor, mechanical fault
P1348Variable Valve Timing System Fault Bank 1
P1350Variable Valve Timing System Fault Bank 2
P1351Ignition control module (ICM) – signal voltage highWiring, ICM, ignition system, mechanical fault, ECM
P1359Crankshaft position (CKP) sensor - connector disconnectionWiring
P1361Ignition control module (ICM) – signal not switchingWiring, ICM, ignition system, mechanical fault, ECM
P1362Crankshaft position (CKP) sensor - no signalWiring, CKP sensor, ECM
P1380ECM to ABS communication – unusable signalWiring, mechanical fault
P1381ECM to ABS communication – misfire detectedWiring, mechanical fault
P1382Camshaft position (CMP) sensor - no signalWiring, CMP sensor, ECM
P1390G-force sensor – intermittent voltage lowWiring, G-force sensor, mechanical fault, ECM
P1391G-force sensor – performanceWiring, G-force sensor, mechanical fault, ECM
P1392G-force.sensor – voltage lowWiring, G-force sensor, mechanical fault, ECM
P1393G-force sensor – voltage highWiring, G-force sensor, mechanical fault, ECM
P1394G-force sensor – intermittent voltage highWiring, G-force sensor, mechanical fault, ECM
P1400 – P1499 (Emission control)
P1400Cold start emission control – malfunctionIntake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1404Exhaust gas recirculation (EGR) valve – stuck openWiring open circuit/short circuit to positive, exhaust gas recirculation (EGR) valve position sensor, EGR solenoid
P1406Exhaust gas recirculation (EGR) system – circuit problemWiring, EGR valve/solenoid/position sensor, mechanical fault, ECM
P1415Secondary air injection (AIR) system, bank 1Wiring, hoses blocked/leaking, AIR valve
P1416Secondary air injection (AIR) system, bank 2Wiring, hoses blocked/leaking, AIR valve
P1441Evaporative emission (EVAP) canister purge system – leak detectedWiring, EVAP valve/solenoid, hoses, mechanical fault
P1442Evaporative emission (EVAP) canister purge switch – voltage highWiring, EVAP valve/solenoid, hoses, mechanical fault
P1456Evaporative emission (EVAP) canister purge system (fuel tank system) - leak detectedHose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/ bypass solenoid, EVAP two way valve, EVAP canister/vent valve
P1457Evaporative emission (EVAP) canister purge system (canister system) - leak detectedHose, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
P1459Evaporative emission (EVAP) canister purge system - switch malfunctionWiring, EVAP flow switch, hose leak/blockage, ECM
P1471Diesel Particulate Filter Regeneration Insufficient
P1481Engine coolant blower motor speed – malfunctionWiring, engine coolant blower motor, ECM
P1482Engine coolant blower motor clutch – incorrect voltageWiring, engine coolant blower motor relay, engine coolant blower motor, ECM
P1484Engine coolant blower motor relay – speed signal variationWiring, engine coolant blower motor relay, engine coolant blower motor, ECM
P1491Exhaust gas recirculation (EGR) system - valve lift insufficientWiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM
P1498Exhaust gas recirculation (EGR) valve position sensor - voltage highWiring, EGR valve/position sensor, ECM
P1508Idle air control (lAC) system – low RPMWiring, lAC valve, mechanical fault, ECM
P1509Idle air control (lAC) system – high RPMWiring, lAC valve, mechanical fault, ECM
P1512Throttle control unit – signal variationWiring, throttle control unit, ECM
P1514Throttle position (TP) sensor/mass air flow   (MAF) sensor – signal variationWiring, TP sensor, MAP sensor, ECM
P1515Throttle command/actual throttle position – signal vpriationWiring, throttle valve sticking, throttle control unit, ECM
P1516Throttle position motor – position performanceThrottle valve tight/sticking, TP sensor, wiring, throttle control unit, ECM
P1517Commanded Versus Actual Throttle Position Correlation
P1518Throttle control module/engine control module   (ECM) – communication malfunctionWiring, throttle control module, ECM
P1519Idle air control (IAC) valve - circuit failureWiring, IAC valve, ECM
P1520Park/neutral position (PNP) switch – circuit malfunctionWiring, PNP switch, mechanical fault
P1521Commanded Versus Actual Throttle Position Correlation Small Stop Close
P1523Throttle position motor – closed position performanceThrottle valve tight/sticking, TP sensor, wiring open circuit/short circuit to ground, throttle control unit, ECM
P1545AIC compressor clutch relay – circuit malf!JnctionWiring open circuit/short circuit to ground/ short circuit to positive, AJC compressor clutch relay, ECM
P1546AIC compressor clutch relay – circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, AJC compressor clutch relay, ECM
P1548A/C Compressor Clutch Output Circuit Malfunction
P1571Brake pedal position (BPP) switch - no operationWiring, BPP switch
P1574Brake pedal position (BPP) switch – circuit malfunctionWiring, BPP switch
P1600 – P1699 (ECM – computer output circuit)
P1600Serial communication - malfunctionECM
P1601Serial communication – malfunctionECM
P1602ECM to ABS communication – circuit malfunctionECM
P1607Engine control module (ECM) - internal circuit failureECM
P1618Engine control module (ECM) – internal faultECM
P1621Engine control module (ECM) – internal memory performanceECM
P1625Engine control module (ECM) – unexpected resetInterference from non standard electronics, erase trouble code and re-test
P1626Immobilizer system – ECM to multifunction control module communicationmalfunctionWiring, ECM, multifunction control module
P1627Engine control module (ECM) - analogue/ digital converterSensor supply wiring open/short circuit, ECM
P1630Engine control module (ECM), immobilizer code – learning modeECM immobilizer code programming not completed
P1631Immobilizer system – password/code incorrectImmobilizer module, incorrect key, mechanical fault, ECM
P1632Immobilizer system – fueling disabled!mobilizer module, incorrect key, mechanical fault, ECM
P1633Engine control module (ECM), ignition supply voltageFuse, wiring open circuit, ECM
P1635Sensor supply voltage - circuit A malfunctionWiring short circuit to ground/positive, ground wiring open circuit, ECM
P1636Engine control module (ECM) – RAM stackInterference from non standard electronics, erase trouble code and re-test
P1637Alternator ‘L’ terminal – circuit malfunctionWiring open circuit/short circuit to ground, alternator, battery temperature sensor, ECM
P1638Alternator field circuit – signal out of rangeWiring, alternator, ECM
P1639Sensor supply voltage - circuit B malfunctionWiring short circuit to ground/positive, ground wiring open circuit, throttle position (TP) sensor, ECM
P1640Engine control module (ECM), output driver 1 – supply voltage highWiring, instruments, EVAP canister purge valve, A/C compressor relay
P1646Sensor supply voltage – circuit C malfunctionWiring short circuit to ground/positive, ground wiring open circuit, accelerator pedal position (APP) sensor, ECM
P1650Engine control module quad driver/output driverWiring, evaporative emission (EVAP) canister purge valve, intake manifold air control solenoid, ECM
P1660AT to ECM - data line failureWiring, TCM, ECM
P1680Engine control module (ECM) – malfunctionECM
P1681Engine control module (ECM) – malfunctionECM
P1682Throttle control module/engine control module   (ECM) – ignition power supply variationWiring, ECM
P1683Engine control module (ECM) – malfunctionECM
P1686AT to ECM - signal B - voltage lowWiring, TCM, ECM
P1687AT to ECM - signal B - voltage highWiring, TCM, ECM
P1689Traction control system (TCS), delivered torque signal – malfunctionWiring, poor connections, ECM
P1705AT - gear shift malfunctionWiring, range position switch, ECM
P1706AT - gear shift malfunctionWiring, range position switch, ECM
P1738Automatic transmissionWiring, clutch pressure switch 2, ECM
P1739Automatic transmissionWiring, clutch pressure switch 3, ECM
P1753AT - lock-up clutch not engaging/ disengagingWiring, lock-up control solenoid A, ECM
P1758AT - lock-up clutch not engagingWiring, lock-up control solenoid B, ECM
P1768AT - lock-up clutch not engagingWiring, linear solenoid, TCM
P1773AT - lock-up clutch not engagingWiring, clutch pressure control solenoid B, ECM
P1786AT - poor gear shiftCommunication wire, ECM
P1788Automatic Transmission Poor Gear Shift
P1790Engine control module (ECM) – AT ROM   checksum errorECM
P1791AT - lock-up clutch not engagingWiring, VSS, TCM
P1792AT – AT EEPROM checksum errorECM
P1794Automatic transmission - BARO signalWiring, ECM, TCM
P1810AT – manual valve position pressure switch malfunctionWiring, manual valve position pressure switch
P1815Transmission fluid pressure (TFP) switch – invalid gear selectionWiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1816Transmission fluid pressure (TFP) switch – invalid gear selectionWiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1818Transmission fluid pressure (TFP) switch – invalid gear selectionWiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1835AT- kick-down switchWiring, kick-down switch, mechanical fault
P1860AT- torque converter clutch (TCC) solenoid circuitWiring, TCC solenoid
P1870AT – component slippingMechanical fault
P1875AT – component slippingMechanical fault
U1000Class 2 communication ID not learnedECM
U10264WD AT control module communication – no signalWiring, 4WD AT control module, ECM
U1040Controller area network (CAN) data bus – communication malfunctionWiring, instrument panel, ECM
U1041ECM to ASS communication – no signalWiring, ABS control module, ECM
U1064ECM to multifunction control module communication – no signalWiring, multifunction control module, ECM
U1096ECM to multifunction control module communication – no signalWiring, multifunction control module, ECM
U1152Class 2 communication ID missingWiring, missing control module
U1300Class 2 communication – low voltageWiring, ECM
U1301Class 2 communication – high voltageWiring, ECM