In the world of automobiles, understanding fault codes is akin to deciphering a secret language that your vehicle speaks when something goes awry. Isuzu vehicles are no exception, and in this comprehensive guide, we will dive deep into the realm of Isuzu fault codes. We’ll uncover their meanings, explore troubleshooting strategies, and shed light on how to prevent them with the Isuzu fault codes list.

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*Please press the following to search through the Isuzu fault codes list: CTRL+ F

Isuzu Fault Codes List
Trouble Code	Fault Location	Probable Cause
P1000 – P1099 (Fuel and air metering and auxiliary emission control)
P1085	High Pressure Fuel Pump Performance
P1093	Fuel Rail Pressure Too Low
P1100 – P1199 (Fuel and air metering)
P1101	Mass air flow (MAF) and manifold absolute pressure (MAP) sensors – circuit malfunction	Wiring, MAF, MAP, ECM
P1106	Manifold absolute pressure (MAP) sensor – circuiUintermittent voltage high	Wiring, MAP sensor, mechanical fault, ECM
P1107	Manifold absolute pressure (MAP) sensor – circuiUintermittent voltage low	Wiring, MAP sensor, mechanical fault, ECM
P1108	Barometric pressure (BARO) sensor – circuit/voltage high	ECM
P1111	Intake air temperature (IAT) sensor – circuit/   intermittent voltage high	Wiring, IAT sensor, ECM
P1112	Intake air temperature (IAT) sensor – circuiU   intermittent voltage low	Wiring, IAT sensor, ECM
P1114	Engine coolant temperature (ECT) sensor- circuiUintermittent voltage low	Wiring, ECT sensor, ECM
P1115	Engine coolant temperature (ECT) sensor- circuit/intermittent voltage high	Wiring, ECT sensor, ECM
P1120	Throttle motor position sensor 1 – circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1121	Throttle position (TP) sensor – circuit/   intermittent voltage high	Wiring, TP sensor, mechanical fault, ECM
P1122	Throttle position (TP) sensor – circuit/   intermittent voltage low	Wiring, TP sensor, mechanical fault, ECM
P1125	Throttle position (TP) motor – fail safe mode	Wiring, TP sensor, TP motor, mechanical fault, ECM
P1128	Manifold absolute pressure (MAP) sensor – pressure lower than expected	MAP sensor
P1129	Manifold absolute pressure (MAP) sensor – pressure higher than expected	MAP sensor
P1133	Heated oxygen sensor (HO2S) – RH front (6 cyl) – insufficient switching	Wiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1134	Heated oxygen sensor (HO2S) – RH front – slow operation	Wiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1137	Heated oxygen sensor (H02S) 1/2- voltage incorrect	Wiring, exhaust system leaking, H02S
P1138	Heated oxygen sensor (H02S) 2 – voltage high	Wiring, H02S
P1153	Heated oxygen sensor (HO2S) – LH front – insufficient switching	Wiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1154	Heated oxygen sensor (HO2S) – LH front – slow operation	Wiring, HO2S, fuel system, fuel pressure, mechanical fault, ECM
P1167	Fuel trim, bank 1 – mixture too rich during deceleration	Injectors, fuel pump, fuel pressure, ECM
P1169	Fuel trim, bank 2 – mixture too rich during deceleration	Injectors, fuel pump, fuel pressure, ECM
P1171	Fuel trim – mixture too lean during acceleration	Wiring, H02/H02S, mechanical fault, fuel system, fuel pressure, ECM
P1174	Fuel Trim Cylinder Balance
P1200 – P1299 (Fuel and air metering – injector circuit)
P1201	Injector Circuit Open / Shorted Cylinder #1
P1202	Injector Circuit Open / Shorted Cylinder #2
P1203	Injector Circuit Open / Shorted Cylinder #3
P1204	Injector Circuit Open / Shorted Cylinder #4
P1205	Injector Circuit Open / Shorted Cylinder #5
P1206	Injector Circuit Open / Shorted Cylinder #6
P1220	Throttle motor position sensor 2 – circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1220   .	Throttle motor position sensor 2 – circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1221	Throttle motor position sensor 1/2 – signal variation	Wiring, throttle control unit, ECM
P1237	High Fuel Pressure Regulator Circuit Shorted To Ground
P1238	High Fuel Pressure Regulator Circuit Shorted To Battery
P1239	High Fuel Pressure System Fault
P1240	High Fuel Pressure Regulator Circuit Open
P1241	High Fuel Pressure Regulator Circuit Low Voltage
P1242	High Fuel Pressure Regulator Circuit High Voltage
P1246	Low Fuel Pressure Regulator Circuit Malfunction
P1247	Low Fuel Pressure Regulator Circuit Low Voltage
P1248	Fuel Pump Relay Control Circuit Open
P1249	Low Fuel Pressure Sensor Circuit High Voltage
P1250	Fuel Pump Relay Control Circuit Shorted To Ground
P1253	VTEC system – malfunction	Wiring, VTEC solenoid, ECM
P1258	Engine coolant – excessive temperature	Wiring, engine coolant blower motor, mechanical fault, ECM
P1259	VTEC system – malfunction	Wiring, VTEC solenoid/pressure switch, ECM
P1271	Accelerator pedal position (APP) sensor 1/2- signal variation	Wiring, APP sensor, ECM
P1272	Accelerator pedal position (APP) sensor 2/3 – signal variation	Wiring, APP sensor, ECM
P1273	Accelerator pedal position (APP) sensor 1/3- signal variation	Wiring, APP sensor, ECM
P1275	Accelerator pedal position (APP) sensor 1 – circuit malfunction	Wiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1280	Accelerator pedal position (APP) sensor 2 – circuit malfunction	Wiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1285	Accelerator pedal position (APP) sensor 3 – circuit malfunction	Wiring, APP sensor, ECM
P1290	Throttle position (TP) motor -forced idle mode	Wiring, APP sensor, TP motor, mechanical fault, ECM
P1293	High Side Open Bank No. 1
P1295	Throttle position (TP) motor – power management mode	Wiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1297	Electrical load sensor – circuit/voltage low	Wiring, electrical load sensor, ECM
P1298	Electrical load sensor – circuit/voltage high	Wiring, electrical load sensor, ECM
P1299	Throttle position (TP) motor – forced engine shut down mode	Wiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1300 – P1399 (Ignition system or misfire)
P1300	Random misfire	Ignition/fuel/EGR system, MAP sensor, IAC valve
P1310	Ignition control module (ICM) – diagnosis	Wiring, ignition coil(s), ICM, ECM
P1311	Ignition control module (ICM) – ignition coil secondary coil signal, circuit 1	Wiring, ignition coil(s), ICM, ECM
P1312	Ignition control module (ICM) – ignition coil secondary coil signal, circuit 2	Wiring, ignition coil(s), ICM, ECM
P1326	Ignition control module (ICM) – combustion quality input signal	Wiring, ignition coil(s), ICM, ECM
P1336	Crankshaft position (CKP) sensor – signal variation	Wiring, CKP sensor, mechanical fault, learning procedure not performed, ECM
P1340	Ignition control module (ICM) – cylinder identification/syncronization	Wiring, ignition coil(s), ICM, ECM
P1345	CKP/CMP signals – signal malfunction	Wiring, CKP/CMP sensor, mechanical fault
P1348	Variable Valve Timing System Fault Bank 1
P1350	Variable Valve Timing System Fault Bank 2
P1351	Ignition control module (ICM) – signal voltage high	Wiring, ICM, ignition system, mechanical fault, ECM
P1359	Crankshaft position (CKP) sensor – connector disconnection	Wiring
P1361	Ignition control module (ICM) – signal not switching	Wiring, ICM, ignition system, mechanical fault, ECM
P1362	Crankshaft position (CKP) sensor – no signal	Wiring, CKP sensor, ECM
P1380	ECM to ABS communication – unusable signal	Wiring, mechanical fault
P1381	ECM to ABS communication – misfire detected	Wiring, mechanical fault
P1382	Camshaft position (CMP) sensor – no signal	Wiring, CMP sensor, ECM
P1390	G-force sensor – intermittent voltage low	Wiring, G-force sensor, mechanical fault, ECM
P1391	G-force sensor – performance	Wiring, G-force sensor, mechanical fault, ECM
P1392	G-force.sensor – voltage low	Wiring, G-force sensor, mechanical fault, ECM
P1393	G-force sensor – voltage high	Wiring, G-force sensor, mechanical fault, ECM
P1394	G-force sensor – intermittent voltage high	Wiring, G-force sensor, mechanical fault, ECM
P1400 – P1499 (Emission control)
P1400	Cold start emission control – malfunction	Intake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1404	Exhaust gas recirculation (EGR) valve – stuck open	Wiring open circuit/short circuit to positive, exhaust gas recirculation (EGR) valve position sensor, EGR solenoid
P1406	Exhaust gas recirculation (EGR) system – circuit problem	Wiring, EGR valve/solenoid/position sensor, mechanical fault, ECM
P1415	Secondary air injection (AIR) system, bank 1	Wiring, hoses blocked/leaking, AIR valve
P1416	Secondary air injection (AIR) system, bank 2	Wiring, hoses blocked/leaking, AIR valve
P1441	Evaporative emission (EVAP) canister purge system – leak detected	Wiring, EVAP valve/solenoid, hoses, mechanical fault
P1442	Evaporative emission (EVAP) canister purge switch – voltage high	Wiring, EVAP valve/solenoid, hoses, mechanical fault
P1456	Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected	Hose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/ bypass solenoid, EVAP two way valve, EVAP canister/vent valve
P1457	Evaporative emission (EVAP) canister purge system (canister system) – leak detected	Hose, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
P1459	Evaporative emission (EVAP) canister purge system – switch malfunction	Wiring, EVAP flow switch, hose leak/blockage, ECM
P1471	Diesel Particulate Filter Regeneration Insufficient
P1481	Engine coolant blower motor speed – malfunction	Wiring, engine coolant blower motor, ECM
P1482	Engine coolant blower motor clutch – incorrect voltage	Wiring, engine coolant blower motor relay, engine coolant blower motor, ECM
P1484	Engine coolant blower motor relay – speed signal variation	Wiring, engine coolant blower motor relay, engine coolant blower motor, ECM
P1491	Exhaust gas recirculation (EGR) system – valve lift insufficient	Wiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM
P1498	Exhaust gas recirculation (EGR) valve position sensor – voltage high	Wiring, EGR valve/position sensor, ECM
P1500 – P1599 (Vehicle or idle speed control)
P1508	Idle air control (lAC) system – low RPM	Wiring, lAC valve, mechanical fault, ECM
P1509	Idle air control (lAC) system – high RPM	Wiring, lAC valve, mechanical fault, ECM
P1512	Throttle control unit – signal variation	Wiring, throttle control unit, ECM
P1514	Throttle position (TP) sensor/mass air flow   (MAF) sensor – signal variation	Wiring, TP sensor, MAP sensor, ECM
P1515	Throttle command/actual throttle position – signal vpriation	Wiring, throttle valve sticking, throttle control unit, ECM
P1516	Throttle position motor – position performance	Throttle valve tight/sticking, TP sensor, wiring, throttle control unit, ECM
P1517	Commanded Versus Actual Throttle Position Correlation
P1518	Throttle control module/engine control module   (ECM) – communication malfunction	Wiring, throttle control module, ECM
P1519	Idle air control (IAC) valve – circuit failure	Wiring, IAC valve, ECM
P1520	Park/neutral position (PNP) switch – circuit malfunction	Wiring, PNP switch, mechanical fault
P1521	Commanded Versus Actual Throttle Position Correlation Small Stop Close
P1523	Throttle position motor – closed position performance	Throttle valve tight/sticking, TP sensor, wiring open circuit/short circuit to ground, throttle control unit, ECM
P1545	AIC compressor clutch relay – circuit malf!Jnction	Wiring open circuit/short circuit to ground/ short circuit to positive, AJC compressor clutch relay, ECM
P1546	AIC compressor clutch relay – circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, AJC compressor clutch relay, ECM
P1548	A/C Compressor Clutch Output Circuit Malfunction
P1571	Brake pedal position (BPP) switch – no operation	Wiring, BPP switch
P1574	Brake pedal position (BPP) switch – circuit malfunction	Wiring, BPP switch
P1600 – P1699 (ECM – computer output circuit)
P1600	Serial communication – malfunction	ECM
P1601	Serial communication – malfunction	ECM
P1602	ECM to ABS communication – circuit malfunction	ECM
P1607	Engine control module (ECM) – internal circuit failure	ECM
P1618	Engine control module (ECM) – internal fault	ECM
P1621	Engine control module (ECM) – internal memory performance	ECM
P1625	Engine control module (ECM) – unexpected reset	Interference from non standard electronics, erase trouble code and re-test
P1626	Immobilizer system – ECM to multifunction control module communicationmalfunction	Wiring, ECM, multifunction control module
P1627	Engine control module (ECM) – analogue/ digital converter	Sensor supply wiring open/short circuit, ECM
P1630	Engine control module (ECM), immobilizer code – learning mode	ECM immobilizer code programming not completed
P1631	Immobilizer system – password/code incorrect	Immobilizer module, incorrect key, mechanical fault, ECM
P1632	Immobilizer system – fueling disabled	!mobilizer module, incorrect key, mechanical fault, ECM
P1633	Engine control module (ECM), ignition supply voltage	Fuse, wiring open circuit, ECM
P1635	Sensor supply voltage – circuit A malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, ECM
P1636	Engine control module (ECM) – RAM stack	Interference from non standard electronics, erase trouble code and re-test
P1637	Alternator ‘L’ terminal – circuit malfunction	Wiring open circuit/short circuit to ground, alternator, battery temperature sensor, ECM
P1638	Alternator field circuit – signal out of range	Wiring, alternator, ECM
P1639	Sensor supply voltage – circuit B malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, throttle position (TP) sensor, ECM
P1640	Engine control module (ECM), output driver 1 – supply voltage high	Wiring, instruments, EVAP canister purge valve, A/C compressor relay
P1646	Sensor supply voltage – circuit C malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, accelerator pedal position (APP) sensor, ECM
P1650	Engine control module quad driver/output driver	Wiring, evaporative emission (EVAP) canister purge valve, intake manifold air control solenoid, ECM
P1660	AT to ECM – data line failure	Wiring, TCM, ECM
P1680	Engine control module (ECM) – malfunction	ECM
P1681	Engine control module (ECM) – malfunction	ECM
P1682	Throttle control module/engine control module   (ECM) – ignition power supply variation	Wiring, ECM
P1683	Engine control module (ECM) – malfunction	ECM
P1686	AT to ECM – signal B – voltage low	Wiring, TCM, ECM
P1687	AT to ECM – signal B – voltage high	Wiring, TCM, ECM
P1689	Traction control system (TCS), delivered torque signal – malfunction	Wiring, poor connections, ECM
P1700 – P1799 (Transmission)
P1705	AT – gear shift malfunction	Wiring, range position switch, ECM
P1706	AT – gear shift malfunction	Wiring, range position switch, ECM
P1738	Automatic transmission	Wiring, clutch pressure switch 2, ECM
P1739	Automatic transmission	Wiring, clutch pressure switch 3, ECM
P1753	AT – lock-up clutch not engaging/ disengaging	Wiring, lock-up control solenoid A, ECM
P1758	AT – lock-up clutch not engaging	Wiring, lock-up control solenoid B, ECM
P1768	AT – lock-up clutch not engaging	Wiring, linear solenoid, TCM
P1773	AT – lock-up clutch not engaging	Wiring, clutch pressure control solenoid B, ECM
P1786	AT – poor gear shift	Communication wire, ECM
P1788	Automatic Transmission Poor Gear Shift
P1790	Engine control module (ECM) – AT ROM   checksum error	ECM
P1791	AT – lock-up clutch not engaging	Wiring, VSS, TCM
P1792	AT – AT EEPROM checksum error	ECM
P1794	Automatic transmission – BARO signal	Wiring, ECM, TCM
P1800 – P1899 (Transmission)
P1810	AT – manual valve position pressure switch malfunction	Wiring, manual valve position pressure switch
P1815	Transmission fluid pressure (TFP) switch – invalid gear selection	Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1816	Transmission fluid pressure (TFP) switch – invalid gear selection	Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1818	Transmission fluid pressure (TFP) switch – invalid gear selection	Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM/TCM
P1835	AT- kick-down switch	Wiring, kick-down switch, mechanical fault
P1860	AT- torque converter clutch (TCC) solenoid circuit	Wiring, TCC solenoid
P1870	AT – component slipping	Mechanical fault
P1875	AT – component slipping	Mechanical fault
U1000 – U2000 (Manufacturer defined, common defination listed)
U1000	Class 2 communication ID not learned	ECM
U1026	4WD AT control module communication – no signal	Wiring, 4WD AT control module, ECM
U1040	Controller area network (CAN) data bus – communication malfunction	Wiring, instrument panel, ECM
U1041	ECM to ASS communication – no signal	Wiring, ABS control module, ECM
U1064	ECM to multifunction control module communication – no signal	Wiring, multifunction control module, ECM
U1096	ECM to multifunction control module communication – no signal	Wiring, multifunction control module, ECM
U1152	Class 2 communication ID missing	Wiring, missing control module
U1300	Class 2 communication – low voltage	Wiring, ECM
U1301	Class 2 communication – high voltage	Wiring, ECM

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Understanding Isuzu Fault Codes List

Isuzu vehicles are equipped with an onboard diagnostic (OBD) system that monitors various components and systems. When an issue arises, this system generates fault codes, providing a valuable insight into the problem. Understanding these codes is the first step in addressing any vehicle-related issue effectively.

Common Isuzu Fault Codes and Their Meanings

Fault Code 101 – Engine Misfire

One of the most common Isuzu fault codes, Code 101, often indicates an engine misfire. This can be caused by issues such as spark plug problems, fuel delivery issues, or a malfunctioning ignition coil.

Fault Code 202 – Oxygen Sensor Malfunction

Code 202 points to a malfunctioning oxygen sensor. The oxygen sensor plays a crucial role in monitoring the air-fuel mixture in the exhaust system. A malfunction can lead to decreased fuel efficiency and increased emissions.

Fault Code 303 – Transmission Fluid Temperature High

Code 303 is related to the transmission system. It suggests that the transmission fluid temperature has exceeded safe levels. This can be caused by issues with the transmission cooler or overheating of the transmission itself.

How to Interpret Isuzu Fault Codes List

Interpreting Isuzu fault codes involves deciphering the alphanumeric sequence and understanding their meanings. The letters often indicate the system or component affected, while the numbers provide specific details about the issue. A comprehensive OBD code reader or a professional mechanic can help with accurate interpretation.

Troubleshooting and Resolving Isuzu Fault Codes

DIY Fixes for Minor Faults

Some Isuzu fault codes may have straightforward solutions, such as loose connectors or minor sensor issues. Before seeking professional help, consider checking for these common culprits and addressing them.

Seeking Professional Assistance

For complex or recurring fault codes, it’s advisable to consult a professional mechanic or an authorized Isuzu service center. They possess the expertise and diagnostic tools needed to pinpoint and resolve intricate issues accurately.

Preventing Isuzu Fault Codes

Prevention is often the best strategy when dealing with Isuzu fault codes. Regular maintenance, including oil changes, filter replacements, and adherence to manufacturer-recommended service intervals, can significantly reduce the likelihood of fault codes.

The Importance of Regular Maintenance

Routine maintenance not only prevents fault codes but also ensures the longevity and optimal performance of your Isuzu vehicle. By following a proactive maintenance schedule, you can avoid costly repairs and unexpected breakdowns.

Unleashing Efficiency: The 30 Min DPF Clean Advantage

When it comes to the intricacies of fault codes on your Isuzu equipment amidst the complexities of heavy machinery, it can be a formidable challenge. But worry not! A beacon of hope emerges on the horizon, and it goes by the name of 30 Min DPF Clean. We offer unparalleled Diesel Particulate Filter (DPF) cleaning services across New Jersey, Philadelphia, and Delaware, setting us apart from the competition. Curious about why you should entrust us with ensuring the seamless operation of your machinery? Let’s delve into the answer.

30 Min DPF Clean: Your Comprehensive Solution

What truly sets 30 Min DPF Clean apart is our holistic approach to machinery maintenance. We don’t limit ourselves to DPF cleaning; we specialize in a comprehensive array of services, including Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR), Diesel Oxidation Catalyst (DOC), and Catalytic Converter cleaning. By harnessing state-of-the-art technology, we ensure your machinery operates seamlessly, effectively minimizing those troublesome fault codes.

Quality Cleaning for Peak Performance

At 30 Min DPF Clean, we understand that a clean machine is a happy machine. This is why we go above and beyond to eliminate ash, soot, and other residues from your diesel engines. Our exceptional DPF Cleaning service guarantees the peak performance of your machinery, providing you with peace of mind while keeping those fault codes at bay.

Competitive Prices, Outstanding Service

In the grand scheme of things, 30 Min DPF Clean offers top-tier service without straining your budget. Our competitive pricing model, combined with outstanding DPF cleaning services, makes us the logical choice for those looking to extend the lifespan of their Isuzu machinery. So, the next time your equipment starts communicating through fault codes, consider getting in touch with 30 Min DPF Clean. Our skilled technicians excel at handling various issues, aiding you in deciphering the Isuzu Fault Codes List and swiftly getting your machinery back on track. Remember, in machinery maintenance, it’s not just about fixing problems—it’s about preventing them. And 30 Min DPF Clean stands as your dependable partner on that journey.

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Conclusion

Isuzu fault codes may seem cryptic at first, but with the knowledge gained from this guide, you’re better equipped to navigate and troubleshoot issues in your vehicle. Remember, understanding these codes empowers you to take control of your Isuzu’s health and performance, ensuring it runs smoothly on the road.

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FAQs About Isuzu Fault Codes

What are Isuzu fault codes?

Isuzu fault codes are alphanumeric combinations that represent specific issues detected by the vehicle’s onboard diagnostic system.

Can I continue driving with an Isuzu fault code?

Whether or not it’s safe to drive with a fault code depends on its severity. Some codes may indicate minor issues, while others may signal significant problems. It’s advisable to address fault codes promptly to prevent further damage.

How often should I check for fault codes on my Isuzu vehicle?

Regularly checking for fault codes during routine maintenance or when you notice unusual symptoms is a good practice. It helps identify and address issues before they escalate.

Are Isuzu fault codes the same for all models?

Isuzu fault codes may vary slightly between different models and generations. Consult your vehicle’s manual or a professional mechanic for model-specific information.

Can fault codes be cleared without fixing the issue?

While it’s possible to clear fault codes, it’s essential to address the underlying problem. Clearing codes without fixing the issue is a temporary solution that may lead to more significant problems in the future.

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For more information on Isuzu equipment and related services, visit the official Isuzu website.