Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 43 (ENGINE CONTROLS - TESTS W/CODES - 7.4L)
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Section 43 (Engine Controls - Tests W/Codes - 7.4L)
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Section 43 (Engine Controls - Tests W/Codes - 7.4L)
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Diagnostic System
- Diagnostic Procedure
- Powertrain On-Board Diagnostic (OBD) System Check
- Mil Inoperative
- DLC Diagnosis Or No Scan Tool Data
- Reading Trouble Codes
- Trouble Code Definition
- Hard Or Intermittent Trouble Code Determination
- Clearing Diagnostic Trouble Codes (DTC)
- ECM/Pcm/VCM Location
- Diagnostic Materials
- Special Tools (Diagnostic)
- Scan Tool Usage
- Summary
- Connector Identification
- Diagnostic Trouble Codes
- Notes
- DTC P0101 - MAF Sensor System Performance
- DTC P0102 - MAF Sensor Circuit Low Frequency
- DTC P0103 - MAF Sensor Circuit High Frequency
- DTC P0106 - Map Sensor System Performance
- DTC P0107 - Map Sensor Circuit Low Voltage
- DTC P0108 - Map Sensor Circuit High Voltage
- DTC P0112 - IAT Sensor Circuit Voltage Low
- IAT Temperature-To-Resistance Values
- DTC P0113 - IAT Sensor Circuit High Voltage
- DTC P0117 - ECT Sensor Circuit Low Voltage
- ECT Temperature-To-Resistance Values
- DTC P0118 - ECT Sensor Circuit High Voltage
- DTC P0121 - TP Sensor Performance
- DTC P0122 - TP Sensor Circuit Low Voltage
- DTC P0123 - TP Sensor Circuit High Voltage
- DTC P0125 - ECT Excessive Time To Closed Loop
- DTC P0131 - Ho2S Circuit Low Voltage Bank 1, Sensor 1
- DTC P0132 - Ho2S Circuit High Voltage Bank 1, Sensor 1
- DTC P0133 - Ho2S Slow Response Bank 1, Sensor 1
- DTC P0134 - Ho2S Circuit Insufficient Activity Bank 1, Sensor 1
- DTC P0135 - Ho2S Heater Circuit Bank 1, Sensor 1
- DTC P0137 - Ho2S Circuit Voltage Low Bank 1, Sensor 2
- DTC P0138 - Ho2S Circuit Voltage High Bank 1, Sensor 2
- DTC P0140 - Ho2S Insufficient Activity Bank 1, Sensor 2
- DTC P0141 - Ho2S Heater Circuit Bank 1, Sensor 2
- DTC P0151 - Ho2S Circuit Voltage Low Bank 2, Sensor 1
- DTC P0152 - Ho2S Circuit Voltage High Bank 2, Sensor 1
- DTC P0153 - Ho2S Slow Response Bank 2, Sensor 1
- DTC P0154 - Ho2S Insufficient Activity Bank 2, Sensor 1
- DTC P0155 - Ho2S Heater Circuit Bank 2, Sensor 1
- DTC P0157 - Ho2S Circuit Voltage Low Bank 2, Sensor 2
- DTC P0158 - Ho2S Circuit Voltage High Bank 2, Sensor 2
- DTC P0160 - Ho2S Insufficient Activity Bank 2, Sensor 2
- DTC P0161 - Ho2S Heater Circuit Bank 2, Sensor 2
- DTC P0171 - Fuel Trim System Lean Bank 1
- DTC P0172 - Fuel Trim System Rich Bank 1
- DTC P0174 - Fuel Trim System Lean Bank 2
- DTC P0175 - Fuel Trim System Rich Bank 2
- DTC P0300-P0308 - Misfire Detected
- DTC P0325 - Knock Sensor Module Circuit
- DTC P0327 - Knock Sensor Noise Channel Low Voltage
- DTC P0336 - Crankshaft Position Sensor Circuit Performance
- DTC P0337 - Crankshaft Position Sensor Circuit Low Frequency
- DTC P0338 - Crankshaft Position Sensor Circuit High Frequency
- DTC P0339 - Crankshaft Position Sensor Circuit Intermittent
- DTC P0340 - Camshaft Position Sensor Circuit
- DTC P0341 - Camshaft Position Sensor (CMP) Circuit Performance
- DTC P0401 - EGR System Flow Insufficient
- DTC P0404 - EGR Valve Open Pintle Position
- DTC P0405 - EGR Pintle Position Circuit Low Voltage
- DTC P0420 - TWC System Low Efficiency Bank 1
- DTC P0430 - TWC System Low Efficiency Bank 2
- DTC P0440 - EVAP System
- DTC P0442 - EVAP System (Small Leak Detected)
- DTC P0446 - EVAP Canister Vent Valve Performance
- DTC P0452 - Fuel Tank Pressure Sensor Low Voltage
- DTC P0453 - Fuel Tank Pressure Sensor Voltage High
- DTC P0461 - Fuel Level Sensor Circuit Performance
- DTC P0462 - Fuel Level Sensor Circuit Voltage Low
- DTC P0463 - Fuel Level Sensor Circuit Voltage High
- DTC P0500 - Vehicle Speed Sensor Circuit
- DTC P0506 - Idle Control System Low Rpm
- DTC P0507 - Idle Control System High Rpm
- DTC P0601 - VCM Memory
- DTC P0602 - VCM Not Programmed
- DTC P0603 - VCM Memory Reset
- DTC P0604 - VCM Ram Performance
- DTC P0605 - VCM Read Only Memory (ROM)
- DTC P1106 - Map Sensor Circuit Intermittent High Voltage
- DTC P1107 - Map Sensor Circuit Intermittent Low Voltage
- DTC P1111 - IAT Sensor Circuit Intermittent High Voltage
- DTC P1112 - IAT Sensor Circuit Intermittent Low Voltage
- DTC P1114 - ECT Sensor Circuit Intermittent Low Voltage
- DTC P1115 - ECT Sensor Circuit Intermittent High Voltage
- DTC P1121 - TP Sensor Circuit Intermittent High Voltage
- DTC P1122 - TP Sensor Circuit Intermittent Low Voltage
- DTC P1133 - Ho2S Insufficient Switching Bank 1, Sensor 1
- DTC P1134 - Ho2S Transition Time Ratio Bank 1, Sensor 1
- DTC P1153 - Ho2S Insufficient Switching Bank 2, Sensor 1
- DTC P1154 - Ho2S Transition Time Ratio Bank 2, Sensor 1
- DTC P1336 - CKP System Variation Not Learned
- DTC P1345 - Crankshaft/Camshaft Position Sensor Correlation
- DTC P1351 - Ignition Control (Ic) Circuit High Voltage
- DTC P1361 - Ignition Control (Ic) Circuit Low Voltage
- DTC P1380 - Electronic Brake Control Module (EBCM) DTC Detected Rough Road Data Unstable
- DTC P1381 - Misfire Detected No EBCM/VCM Serial Data
- DTC P1404 - EGR Valve Closed Pintle Position
- DTC P1508 - Idle Air Control System Low Rpm
- DTC P1509 - Idle Air Control System High Rpm
- DTC P1621 - VCM EEPROM Performance
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.