When the "Check Engine," "Check Trans," or "TOD" light begins to flash on your Isuzu dashboard, it’s a signal that the Powertrain Control Module (PCM) has detected a fault. This comprehensive guide to Isuzu Fault Codes covers the second-generation Isuzu family, providing clarity on generic OBD-II codes and manufacturer-specific Isuzu codes.
Most Isuzu models from 1998–2004, including the Trooper and Rodeo, share the 3.2L/3.5L V6 architecture. Common engine codes include:
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P0171 / P0174 (System Too Lean): Usually indicates a vacuum leak at the intake manifold or a contaminated MAF sensor—common on the 6VE1 engine.
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P0401 (EGR Flow Insufficient): A frequent issue caused by carbon buildup in the EGR valve or intake passages.
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P0300 (Random Misfire): Often linked to oil-fouled spark plug wells or failing ignition coils.
Isuzu Frontera 1998-2002
| Password for PDF: truckfixdiagn.com | |
| 1999 Frontera X22SE 2.2L Engine Fault Codes (DTC) | Download |
| 1999 Frontera 6VD1 3.2L Engine Fault Codes (DTC) | Download |
| 2000 Frontera X22SE 2.2L Engine Fault Codes (DTC) | Download |
| 2000 Frontera 6VD1 3.2L Engine Fault Codes (DTC) | Download |
| 2001 Frontera 6VD1 3.2L Engine Fault Codes (DTC) | Download |
| Frontera SRS Control System Fault Codes. | Download |
| 4L30-E Transmission Control System Fault Codes | Download |
Isuzu Trooper
| Password for PDF: truckfixdiagn.com | |
| Driveline Control System (TOD) Diagnostic Trouble Codes | Download |
| Engine 3.5L Fault Codes (DTC) | Download |
| Transmission Control System Fault Codes. Diagnostic | Download |
| Restraint Control System Fault Codes | Download |
Isuzu Rodeo
| Password for PDF: truckfixdiagn.com | |
| Driveline Control System (TOD) Diagnostic Trouble Codes | Download |
| Brakes Control System Fault Codes | Download |
| Engine 2.2L Fault Codes (DTC) | Download |
| Engine 3.2L Fault Codes (DTC) | Download |
| Transmission Control System Fault Codes. Diagnostic | Download |
| Restraint SRS Control System Fault Codes | Download |
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