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.
2003 Chevrolet Monte Carlo LSFACTORY OEM SERVICE PROCEDURE
Engine Controls Self-Diagnostics - 3.4L
- Introduction
- Self-Diagnostic System
- Programming
- Notes
- Powertrain Control Module
- Service Programming System Remote Procedure
- Service Programming System Pass-Thru Procedure
- Service Programming System Off Board Remote Procedure
- Service Programming System Off Board Pass-Thru Procedure
- CKP System Variation Learn Procedure
- Programming Theft Deterrent System Components
- Drive Cycles
- Inspection/Maintenance System Check
- Inspection/Maintenance Complete System Set Procedure
- Inspection/Maintenance System DTCS
- Inspection/Maintenance Catalyst System Set Procedure
- Inspection/Maintenance Exhaust Gas RECIRCULATION System Set Procedure
- Inspection/Maintenance Evaporative Emission System Set Procedure
- Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure
- Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure
- Summary
- Diagnostic Trouble Code Definitions
- Component Locations
- Connector Identification
- System Tests
- Diagnostic Tests
- Notes
- DTC P0030: Ho2S 1 Heater Control Circuit
- DTC P0101: MAF Sensor Performance
- DTC P0102: MAF Sensor Circuit - Low Voltage
- DTC P0103: MAF Sensor Circuit - High Frequency
- DTC P0107: Manifold Absolute Pressure Sensor Circuit - Low Voltage
- DTC P0108: Manifold Absolute Pressure Sensor Circuit - High Voltage
- DTC P0112: Intake Air Temperature Sensor Circuit - Low Voltage
- DTC P0113: Intake Air Temperature Sensor Circuit - High Voltage
- DTC P0116: ECT Sensor Circuit Performance
- DTC P0117: Engine Coolant Temperature Sensor Circuit - Low Voltage
- DTC P0118: Engine Coolant Temperature Sensor Circuit - High Voltage
- DTC P0121: TP Sensor Performance
- DTC P0122: Throttle Position Sensor Circuit - Low Voltage
- DTC P0123: Throttle Position Sensor Circuit - High Voltage
- DTC P0125: Engine Coolant Temperature Insufficient For Closed Loop Fuel Control
- DTC P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature
- DTC P0130: Ho2S 1 Circuit Closed Loop Performance
- DTC P0131: Ho2S Circuit Low Voltage - Sensor 1
- DTC P0132: Ho2S Circuit High Voltage - Sensor 1
- DTC P0133: Ho2S Slow Response - Sensor 1
- DTC P0134: Ho2S 1 Circuit Insufficient Activity
- DTC P0135: Ho2S 1 Heater Performance
- DTC P0137: Ho2S 2 Circuit Low Voltage
- DTC P0138: Ho2S 2 Circuit High Voltage
- DTC P0140: Ho2S 2 Circuit - Insufficient Activity
- DTC P0141: Ho2S 2 Heater Performance
- DTC P0171: Fuel Trim System Lean
- DTC P0172: Fuel Trim System Rich
- DTC P0201-P0206: Injector Control Circuit
- DTC P0230: Fuel Pump Primary Circuit
- DTC P0300-P0306: Engine Misfire Detected
- DTC P0325: Knock Sensor Circuit Malfunction
- DTC P0327: Knock Sensor Circuit
- DTC P0336: Crankshaft Position Sensor Performance
- DTC P0341: Camshaft Position Sensor Performance
- DTC P0401: EGR System
- DTC P0403: EGR Solenoid Control Circuit
- DTC P0404: EGR System
- DTC P0405: EGR Sensor Circuit - Low Voltage
- DTC P0420: TWC System - Low Efficiency
- DTC P0440: Evaporative Emission System
- DTC P0442: Evaporative Emission Control System - Small Leak Detected
- DTC P0443: EVAP Purge Solenoid Control Circuit
- DTC P0446: Evaporative Emission Vent System Performance
- DTC P0449: EVAP Canister Vent Solenoid Control Circuit
- DTC P0452: Fuel Tank Pressure Sensor Circuit - Low Voltage
- DTC P0453: Fuel Tank Pressure Sensor Circuit - High Voltage
- DTC P0506: Idle Speed Low
- DTC P0507: Idle Speed High
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 Or P2610: Ecu Malfunction
- DTC P0650: Mil Control Circuit
- 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 - Sensor 1
- DTC P1134: Ho2S Transition Time Ratio - Sensor 1
- DTC P1336: Crankshaft Position System Variation Not Learned
- DTC P1351: Ic Circuit High Voltage
- DTC P1352: Ic Output High/Pulse Detected
- DTC P1361: Ic Circuit Low Voltage
- DTC P1362: Ic Cylinder No. 2 Not Toggling After Enable
- DTC P1374: 3X Reference Circuit
- DTC P1380: EBTCM DTC Detected Rough Road Data Unusable
- DTC P1381: Misfire Detected No EBTCM/Pcm Serial Data
- DTC P1404: EGR System
- DTC P1441: Evaporative Emission System Flow During Non-Purge
- DTC P1635: 5-Volt Reference Low
- DTC P1639: 5-Volt Reference 2 Circuit
- DTC P1640: Driver 1 Input - High Voltage
- DTC P1650: Driver 2 Input - High Voltage
- DTC P1660: Cooling Fans Control Circuit
- DTC P1670: Output Driver Module No. 4
- Wiring Diagrams
Factory Service Tools
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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.
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