LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 1997 >> Trooper LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Code Definitions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Definitions

NOTE: If any DTCs not listed here are displayed by a scan tool, the scan tool data may be faulty. Notify the scan tool manufacturer of any DTCs displayed that are not included in the following.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Type Component/System Most Likely Cause
P0101  /B MAF Sensor Circuit Range/ Performance Problem MAF Sensor
P0102  /A MAF Sensor Circuit Low Frequency Open/Short, MAF Sensor Or PCM
P0103  /A MAF Sensor Circuit High Frequency Open/Short, MAF Sensor Or PCM
P0106  /A MAP Sensor Circuit Range/ Performance Problem MAP Sensor
P0107  /A MAP Sensor Circuit Low Frequency Open/Short, MAP Sensor Or PCM
P0108  /A MAP Sensor Circuit High Frequency Open, MAP Sensor Or PCM
P0112  /A IAT Sensor Circuit Low Frequency Short, IAT Sensor Or PCM
P0113  /A IAT Sensor Circuit High Frequency Open, IAT Sensor Or PCM
P0117  /A ECT Sensor Circuit Low Frequency Short, ECT Sensor Or PCM
P0118  /A ECT Sensor Circuit High Frequency Open, ECT Sensor Or PCM
P0121  /A TP Sensor Circuit Range/ Performance Problem TP Sensor Or PCM
P0122  /A TP Sensor Circuit Low Frequency Open/Short, TP Sensor Or PCM
P0123  /A TP Sensor Circuit High Frequency Open Circuit, TP Sensor Or PCM
P0125  /B ECT Sensor Circuit Excessive Warm-Up Time To Closed Loop Cooling System, ECT Or PCM
P0131  /A Bank 1 Primary HO2S Circuit Low Voltage Short, HO2S Sensor, Fuel Supply Or PCM
P0132  /A Bank 1 Primary HO2S Circuit High Voltage Open, HO2S Sensor Or PCM
P0133  /B Bank 1 Primary HO2S Slow Response HO2S Sensor Or Exhaust System
P0134  /A Bank 1 Primary HO2S Insufficient Activity Poor Connections, HO2S Sensor Or PCM
P0135  /B Bank 1 Primary HO2S Heater Circuit Malfunction Open/Short Or PCM
P0137  /A Bank 1 Secondary HO2S Circuit Low Voltage Short, HO2S Or PCM
P0138  /A Bank 1 Secondary HO2S Circuit High Voltage Open, HO2S Or PCM
P0140  /A Bank 1 Secondary HO2S Circuit Insufficient Activity Short In Circuit, HO2S Or PCM
P0141  /B Bank 1 Secondary HO2S Circuit Malfunction Open/Short In Heater Circuit Or PCM
P0143  /A Bank 1 Secondary HO2S Low Voltage (M/T Only) Short, HO2S Or PCM
P0144  /A Bank 1 Secondary HO2S High Voltage (M/T Only) Open/Short, HO2S Or PCM
P0146  /A Bank 1 Secondary HO2S Insufficient Activity (M/T Only) Short, HO2S Or PCM
P0147  /B Bank 1 Secondary HO2S Heater Circuit (M/T Only) Short Or HO2S
P0151  /A Bank 2 Secondary HO2S Circuit Low Voltage Short Or PCM
P0152  /A Bank 2 Secondary HO2S Circuit High Voltage Short, HO2S Or PCM
P0153  /B Bank 2 Secondary HO2S Circuit Slow Response Open/Short, HO2S Contamination Or PCM
P0154  /A Bank 2 Secondary HO2S Insufficient Activity HO2S Or PCM
P0155  /B Bank 2 Secondary HO2S Heater Circuit Short Or HO2S
P0157  /A Bank 2 Secondary HO2S Circuit Low Voltage (A/T Only) Short Or PCM
P0158  /A Bank 2 Secondary HO2S Circuit High Voltage (A/T Only) Short, HO2S Or PCM
P0160  /A Bank 2 Secondary HO2S Circuit Insufficient Activity (A/T Only) Short, HO2S Or PCM
P0161  /B Bank 2 Secondary HO2S Heater Circuit Malfunction (A/T Only) Short Or HO2S
P0171  /B Bank 1 System Too Lean Fuel Supply/ Contamination, Primary HO2S, MAP, Leaking Exhaust Or Valve Clearance
P0172  /B Bank 1 System Too Rich Fule Supply, Primary HO2S, MAP Sensor, Fuel Contamination Or Valve Clearance
P0174  /B Bank 2 System Too Lean Air Intake System, MAF Sensor, Fuel Supply Or Exhaust System
P0175  /B Bank 2 System Too Rich Air Intake System, MAF Sensor, Fuel Supply Or TP Sensor
P0200/A Injector Control Circuit Open/Short, Faulty Injector Or PCM
P0201  /A Injector No. 1 Circuit Malfunction Open/Short Or PCM
P0202  /A Injector No. 2 Circuit Malfunction Open/Short Or PCM
P0203  /A Injector No. 3 Circuit Malfunction Open/Short Or PCM
P0204  /A Injector No. 4 Circuit Malfunction Open/Short Or PCM
P0205  /A Injector No. 5 Circuit Malfunction Open/Short Or PCM
P0206  /A Injector No. 6 Circuit Malfunction Open/Short Or PCM
P0218/D Transmission High Temp. Condition(A/T Only) Miscellaneous
P0300  /B Random Misfire Detected Ignition System, Fuel Supply, MAP Sensor, EGR System Detected System, IAC Valve Or Contaminated Fuel
P0301  /B Cylinder No. 1 Misfire Detected Miscellaneous
P0302  /B Cylinder No. 2 Misfire Detected Miscellaneous
P0303  /B Cylinder No. 3 Misfire Detected Miscellaneous
P0304  /B Cylinder No. 4 Misfire Detected Miscellaneous
P0305  /B Cylinder No. 5 Misfire Detected Miscellaneous
P0306  /B Cylinder No. 6 Misfire Detected Miscellaneous
P0325  /A Knock Sensor (KS) Circuit Malfunction PCM
P0327  /A KS Circuit Open/Short, KS Or PCM
P0335/A Crankshaft Position (CKP) Sensor Circuit Malfunction CKP Sensor, Circuit Or PCM
P0336  /B CKP Sensor Range/Performance CKP Sensor, Valve Timing Or Timing Belt Skipped Teeth
P0337  /B CKP Circuit Low Frequency Open/Short, CKP Sensor Or PCM
P0338/A CKP Sensor High Frequency CKP Sensor Circuit Or VCM
P0339/A CKP Sensor Circuit Intermittent CKP Sensor, CKP Sensor Circuit Or VCM
P0340/A CMP Sensor Circuit CMP Sensor, CMP Sensor Circuit Or VCM
P0341  /A CMP Circuit Performance Open/Short, CMP Sensor, Faulty Or Missing CMP Magnet OR PCM
P0342  /A CMP Sensor Low Frequency CMP Sensor/Magnet Or PCM
P0351  /A Ignition Coil 1 Circuit Ignition Control Module (ICM), Open/ Short Or PCM
P0352  /A Ignition Coil 2 Circuit Miscellaneous
P0353  /A Ignition Coil 3 Circuit Miscellaneous
P0354  /A Ignition Coil 4 Circuit Miscellaneous
P0355  /A Ignition Coil 5 Circuit Miscellaneous
P0356  /A Ignition Coil 6 Circuit Miscellaneous
P0401  /A Insufficient EGR Flow Detected EGR Valve Or Line
P0404/A EGR Valve Pintle Position Open EGR Valve, EGR Valve Circuit Or PCM
P0405/A EGR Valve Sensor Signal Low EGR Valve, EGR Valve Circuit Or PCM
P0420  /A Bank 1 Catalyst System Efficiency Below Threshold Catalytic Converter Or Secondary HO2S
P0430  /A Bank 2 Catalyst System Efficiency Below Threshold (A/T Only) Catalytic Converter Or Secondary HO2S
P0440  /A EVAP System Canister Purge Valve,Vent Solenoid Or Hoses
P0441/B Evaporative Emission Control System, Incorrect Purge Flow EVAP Canister, Vacuum Switch, Purge Solenoid Or PCM
P0442  /A EVAP Small Leak Detected Vent Solenoid, Fuel Cap Or Lines
P0446  /A EVAP Canister Vent Blocked Vent Solenoid Or Canister
P0460/D EVAP Fuel Level Sensor Circuit Miscellaneous
P0461  /D Fuel Level Sensor Circuit Performance Fuel Level Sensor/ Circuit Or PCM/VCM
P0462  /D Fuel Level Sensor Circuit Low Voltage Fuel LevelSensor/ Circuit Or PCM/VCM
P0463  /D Fuel Level Sensor Circuit High Voltage Fuel Level Sensor/ Circuit Or PCM/VCM
P0500/A Vehicle Speed Sensor (VSS) Circuit VSS, Circuit Or PCM
P0501/A Vehicle Speed Sensor (VSS) Circuit Range/Performance VSS, Circuit Or PCM
P0502  /A VSS Circuit Low Frequency Open/Short, VSS Or PCM
P0506  /B Idle Control System Low RPM IAC Valve Or PCM
P0507  /B Idle Control System High RPM IAC Valve Or PCM
P0530/D A/C Refrigerant Pressure Sensor Circuit Open, A/C Refrigerant Pressure Sensor Or PCM
P0560/D System Voltage Malfunction (A/T Only) Miscellaneous
P0562  /D System Voltage Low Open Or PCM
P0563  /D System Voltage High PCM
P0601  /A Powertrain Control module (PCM) Memory Check Sum Error PCM
P0602/D PCM Not Programmed PCM
P0704/B Clutch Switch Circuit Clutch Switch/ Circuit Or VCM
P0705/D Transmission Range Sensor Circuit Malfunction Miscellaneous
P0706/D Transmission Range Sensor Rationality Miscellaneous
P0712/D Transmission Fluid Temperature Low Voltage Miscellaneous
P0713/D Transmission Fluid Temperature High Voltage Miscellaneous
P0719/D Brake Switch Circuit Low Miscellaneous
P0722/A Output Speed Sensor Circuit No Signal Miscellaneous
P0723/A Output speed Sensor Circuit Intermittent Signal Miscellaneous
P0724/D Brake Switch Circuit High Miscellaneous
P0730/C Wont Shift Between 1/2nd, 2/3rd, 2/4th. Stuck in 1st Or 4th gears (A/T) Faulty Shift Control System
P0742/A Torque Converter Clutch Circuit Stuck On Miscellaneous
P0748/C Transmission Pressure Control Solenoid Electrical Circuit Fault Miscellaneous
P0751/B Transmission Shift Solenoid "A" Performance Or Stuck Off (A/T Only) Miscellaneous
P0753/A Transmission Shift Solenoid "A" - Electrical Circuit Fault Open/Short In Circuit Or Faulty Solenoid
P0756/B Transmission Shift Solenoid "B" Performance Stuck Off (A/T Only) Miscellaneous
P0758/A Transmission Shift Solenoid "B" - Electrical Circuit Fault Open/Short In Circuit Or Faulty Solenoid
P1106  /D Manifold Absolute Pressure (MAP) Circuit Intermittent High Voltage Open/Short In Circuit
P1107  /D MAP/Barometric Pressure Circuit Low Voltage Intermittent Open/ Short Or PCM
P1111  /D Intake Air Temperature (IAT) Circuit Intermittent High Voltage Poor Ground Or Open Circuit
P1112  /D IAT Circuit Intermittent Low Voltage Short In Circuit
P1114  /D Engine Coolant Temperature (ECT) Circuit Intermittent Low Voltage Intermittent Short
P1115  /D ECT Circuit Intermittent High Voltage Poor PCM Ground Or Open
P1121  /D Throttle Position (TP) Circuit Intermittent High Voltage Open/Short Or Poor Ground In Circuit
P1122  /D TP Circuit Intermittent Low Voltage Open/Short Or Poor Ground In Circuit
P1133  /B Bank 1 Primary HO2S Circuit Insufficient Switching Exhaust Leak, Short In Circuit, HO2S Or PCM
P1134  /B Bank 1 Primary HO2S Circuit Transition Time Ratio Exhaust Leak, Open/ Short In Circuit, HO2S Or PCM
P1153  /B Bank 2 Primary HO2S Circuit Insufficient Switching Exhaust Leak, Short In Circuit, HO2S Or PCM
P1154  /B Bank 2 Primary HO2S Circuit Transition Time Ratio Exhaust Leak, Open/ Short In Circuit HO2S Or PCM
P1171  /A Fuel System Lean During Acceleration Fuel Pressure, Incorrect Fuel Or Hot Fuel
P1336 CKP System Variation Not Learned Miscellaneous
P1345 CMP/CKP Sensor Correlation Mechinical Problem
P1351 Ignition Control Circuit High Voltage Ignition Module/ Circuit Or VCM
P1361 Top Dead Center Sensor Intermittent Interruption TDC Sensor
P1380/A ABS DTC Detected Rough Road Data Unusable PCM
P1381/A CPS Intermittent Interruption CYP Sensor
P1390  /D G-Sensor Circuit Intermittent Low Voltage Open/Short
P1391  /B G-Sensor Circuit Performance G-Sensor Or PCM
P1392  /A G-Sensor Circuit Low Voltage PCM
P1393  /A G-Sensor Circuit High Voltage Poor Grounds, G-Sensor Or PCM
P1394  /D G-Sensor Circuit Intermittent High Voltage Poor Ground, MAP Or G-Sensor
P1404 EGR Valve Closed Pintle Position EGR Valve/Circuit Or PCM
P1406  /A Exhaust Gas Recirculation (EGR) Valve Pintle Position Circuit Open/Short, EGR Or PCM
P1441  /B Evaporative Emission (EVAP) System Flow During Non-Purge Short, PCM, EVAP Purge Solenoid Or EVAP Vacuum Switch
P1442/B EVAP System Vacuum Switch Circuit Open/Short, PCM Or EVAP Vacuum Switch
P1508  /B Idle Control System Low RPM IAC Valve Circuit Or PCM
P1509  /B Idle Control System High RPM Vacuume Leaks, IAC Circuit Or PCM
P1520 Park Neutral Position (PNP) Switch Circuit PNP Switch Or Circuit
P1601 Serial Communication Malfunction PCM Or Data Bus
P1602 EBCM/EBTCM Serial Data Circuit PCM Or Data Bus
P1607 PCM Internal Circuit Failure "A" PCM
P1618  /A Serial Peripheral Interface. PCM Interprocessor Communication Error PCM
P1621 PCM Memory Performance PCM
P1640  /D ODM "A" Fault Open in Ignition Circuit Or PCM