Note. To locate components, see COMPONENT LOCATIONS . For circuit reference, see WIRING DIAGRAMS article. For connector terminal identification, see CONNECTOR IDENTIFICATION .
Home/Chevrolet/Silverado 2500/Chevrolet Silverado 2500 (2000-2004)/Repair manual/Testing & Diagnostics/DTC P0128: ECT LESS THAN THERMOSTAT REGULATING TEMPERATURE
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls Self-Diagnostics - 6.6L Diesel: Overview
- Engine Controls Self-Diagnostics - 6.6L Diesel: Diagnosis
- Engine Controls Self-Diagnostics - 6.6L Diesel: Maintenance
- Engine Controls Self-Diagnostics - 6.6L Diesel: Wiring
- Engine Controls Self-Diagnostics - 6.6L Diesel: Component Locations
- Engine Controls Self-Diagnostics - 6.6L Diesel: NVH
- Engine Controls Self-Diagnostics - 6.6L Diesel: Other
- DTC P0087: FUEL RAIL PRESSURE - LOW
- DTC P0088: FUEL RAIL PRESSURE - HIGH
- DTC P0089: FUEL RAIL PRESSURE OUT OF RANGE
- DTC P0090: FUEL RAIL PRESSURE SENSOR CURRENT OUT OF RANGE
- DTC P0101: MASS AIR FLOW SENSOR PERFORMANCE
- DTC P0102: MAF SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0103: MAF SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0106: BARO SYSTEM PERFORMANCE (CA)
- DTC P0106: BARO SYSTEM PERFORMANCE (FED)
- DTC P0107: BARO SENSOR CIRCUIT - LOW PRESSURE (CA)
- DTC P0107: BARO SENSOR CIRCUIT - LOW PRESSURE (FED)
- DTC P0108: BARO SENSOR CIRCUIT - HIGH PRESSURE (CA)
- DTC P0108: BARO SENSOR CIRCUIT - HIGH PRESSURE (FED)
- DTC P0112: IAT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0113: IAT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0116: ECT SENSOR PERFORMANCE
- DTC P0117: ECT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ECT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0128: ECT LESS THAN THERMOSTAT REGULATING TEMPERATURE
- DTC P0168: FUEL RAIL TEMPERATURE SENSOR HIGH
- DTC P0181: FUEL RAIL TEMPERATURE SENSOR & IAT SENSOR TEMPERATURE NOT WITHIN SPECIFICATION
- DTC P0182: FUEL RAIL TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0183: FUEL RAIL TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0192: FUEL RAIL PRESSURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0193: FUEL RAIL PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0201-P0208: FUEL INJECTOR CONTROL CIRCUITS
- DTC P0234: TC ENGINE OVERBOOST CONDITION (CA)
- DTC P0234: TC ENGINE OVERBOOST CONDITION (FED)
- DTC P0236: TC BOOST SYSTEM (CA)
- DTC P0236: TC BOOST SYSTEM (FED)
- DTC P0237: TC BOOST SENSOR CIRCUIT LOW VOLTAGE (CA)
- DTC P0237: TC BOOST SENSOR CIRCUIT LOW VOLTAGE (FED)
- DTC P0238: TC BOOST SENSOR CIRCUIT HIGH VOLTAGE (CA)
- DTC P0238: TC BOOST SENSOR CIRCUIT HIGH VOLTAGE (FED)
- DTC P0300: ENGINE MISFIRE DETECTED
- DTC P0301-P0308: CYLINDERS NO. 1-8 MISFIRE DETECTED
- DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT
- DTC P0336: CRANKSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0340: CMP SENSOR CIRCUIT PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0370 & P0374: TIMING REFERENCE HIGH RESOLUTION
- DTC P0380: GLOW PLUG CIRCUIT PERFORMANCE (CA)
- DTC P0380: GLOW PLUG CIRCUIT PERFORMANCE (FED)
- DTC P0401: EGR SYSTEM - INSUFFICIENT FLOW
- DTC P0404: EGR VALVE OPEN PINTLE POSITION
- DTC P0405: EGR PINTLE POSITION CIRCUIT - LOW VOLTAGE
- DTC P0406: EGR SENSOR CIRCUIT HIGH VOLTAGE
- DTC P0489: EGR SOLENOID CIRCUIT - LOW VOLTAGE
- DTC P0490: EGR SOLENOID CIRCUIT - HIGH VOLTAGE
- DTC P0500: VEHICLE SPEED SENSOR (ALLISON A/T)
- DTC P0500: VEHICLE SPEED SENSOR (M/T)
- DTC P0540: INTAKE AIR HEATER - INCORRECT VOLTAGE
- DTC P0543: INTAKE AIR HEATER - INCORRECT VOLTAGE
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 & P1683: ECM MEMORY
- DTC P0611: FUEL INJECTION CONTROL MODULE INTERNAL FAULT
- DTC P0612: FUEL INJECTION CONTROL MODULE INTERNAL FAULT
- DTC P0650: MIL CONTROL CIRCUIT
- DTC P0700: TCM MIL REQUEST
- DTC P0703: BRAKE SWITCH CIRCUIT (ALLISON A/T)
- DTC P0704: CLUTCH PEDAL SWITCH
- DTC P0708: TRANSMISSION RANGE SWITCH (ALLISON A/T)
- DTC P1093: FUEL RAIL PRESSURE OUT OF RANGE
- DTC P1094: EXCESSIVE FUEL INJECTION PUMP FLOW
- DTC P1125: ACCELERATOR PEDAL POSITION SENSORS OUT OF RANGE OR DISAGREE
- DTC P1172: FUEL TRANSFER WITH SECONDARY PUMP
- DTC P1191: INTAKE AIR DUCT AIR LEAK
- DTC P1223, P1226, P1229, P1232, P1235, P1238, P1241 & P1244: INCORRECT VOLTAGE FOR COMMANDED STATE OF AN INJECTOR DRIVER
- DTC P1261: ECM DETECTS A CIRCUIT FAULT RELATED TO HIGH VOLTAGE CIRCUIT TO CYLINDERS NO. 1, 4, 6 & 7
- DTC P1262: ECM DETECTS A CIRCUIT FAULT RELATED TO HIGH VOLTAGE CIRCUIT TO CYLINDERS NO. 2, 3, 5 & 8
- DTC P1270: ACCELERATOR PEDAL POSITION SENSOR A/D CONVERTER ERROR
- DTC P1271: APP SENSOR 1-2 PERFORMANCE
- DTC P1272: ACCELERATOR PEDAL POSITION SENSOR 2
- DTC P1273: ACCELERATOR PEDAL POSITION SENSOR 1
- DTC P1277: ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT LOW VOLTAGE
- DTC P1278: ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT HIGH VOLTAGE
- DTC P1282: ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT LOW VOLTAGE
- DTC P1283: ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT HIGH VOLTAGE
- DTC P1287: ACCELERATOR PEDAL POSITION SENSOR 3 CIRCUIT LOW VOLTAGE
- DTC P1288: ACCELERATOR PEDAL POSITION SENSOR 3 CIRCUIT LOW VOLTAGE
- DTC P1345: CKP/CMP CORRELATION
- DTC P1404: EGR VALVE CLOSED PINTLE POSITION
- DTC P1550: FUEL INJECTION CONTROL MODULE - LOW VOLTAGE
- DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT
- DTC P1639: 5-VOLT REFERENCE 2 CIRCUIT
- DTC P1643: WAIT TO START INDICATOR CONTROL CIRCUIT
- DTC P1658: FUEL INJECTION CONTROL MODULE DRIVER CIRCUITS
- DTC P1781: TCM MIL REQUEST CIRCUIT
- DTC P2141: EGR THROTTLE VALVE VACUUM CONTROL SOLENOID CIRCUIT - LOW VOLTAGE
- DTC P2142: EGR THROTTLE VALVE VACUUM CONTROL SOLENOID CIRCUIT - HIGH VOLTAGE
- DTC P2144: EGR VACUUM VENT SOLENOID CONTROL CIRCUIT - LOW VOLTAGE
- DTC P2145: EGR VACUUM VENT SOLENOID CONTROL CIRCUIT - HIGH VOLTAGE
- Engine Controls - Basic Diagnostic Procedures: Overview
- Engine Controls - Basic Diagnostic Procedures: Diagnosis
- Engine Controls - Basic Diagnostic Procedures: Other
- Engine Controls - Trouble Shooting - No Codes: Diagnosis
- Engine Controls - Trouble Shooting - No Codes: Wiring
- Engine Controls - Trouble Shooting - No Codes: NVH
- Engine Controls - Trouble Shooting - No Codes: Other
- Engine Controls - System & Component Testing: Specifications
- Engine Controls - System & Component Testing: Overview
- Engine Controls - System & Component Testing: Diagnosis
- Engine Controls - System & Component Testing: Maintenance
- Engine Controls - System & Component Testing: Wiring
- Engine Controls - System & Component Testing: Other
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: Overview
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: Diagnosis
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: Wiring
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: Component Locations
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: NVH
- Engine Controls Self-Diagnostics - 6.0L - Bi-Fuel & Cng: Other
- DTC P0101: MASS AIR FLOW SENSOR PERFORMANCE
- DTC P0102: MAF SENSOR CIRCUIT - LOW FREQUENCY
- DTC P0103: MAF SENSOR CIRCUIT - HIGH FREQUENCY
- DTC P0106: MAP/TP SENSOR PERFORMANCE/RANGE
- DTC P0107: MAP SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0108: MAP SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0112: IAT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0113: IAT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0117: ECT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ECT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0121: TP SENSOR ANGLE OUT OF RANGE
- DTC P0122: TP SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0123: TP SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0125: ECT EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL
- DTC P0131 & P0151: HO2S BANK 1 & 2 SENSOR 1 CIRCUIT - LOW VOLTAGE
- DTC P0132 & P0152: HO2S BANK 1 & 2 SENSOR 1 CIRCUIT - HIGH VOLTAGE
- DTC P0134 & P0154: HO2S BANK 1 & 2 SENSOR 1 CIRCUIT - INSUFFICIENT ACTIVITY
- DTC P0135 & P0155: HO2S BANK 1& 2 SENSOR 1 HEATER CIRCUIT
- 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 P0182: FUEL TANK TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0183: FUEL TANK TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0187: FUEL RAIL TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0188: FUEL RAIL TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0192: FUEL RAIL PRESSURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0193: FUEL RAIL PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0201-P0208: INJECTOR CONTROL CIRCUITS
- DTC P0336: CRANKSHAFT POSITION SENSOR PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0405: EGR VALVE POSITION CIRCUIT - LOW VOLTAGE
- DTC P0406: EGR VALVE POSITION CIRCUIT - HIGH VOLTAGE
- DTC P0500: VSS CIRCUIT
- DTC P0600: CLASS 2 SERIAL DATA CIRCUIT
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 & P2610: AF ECM MEMORY
- DTC P0705: TRANSMISSION RANGE SWITCH
- DTC P1215: CONTROL CIRCUIT FAULT
- DTC P1432: FUEL TANK PRESSURE SENSOR SIGNAL LOW
- DTC P1433: FUEL PRESSURE SENSOR SIGNAL HIGH
- DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT
- DTC P1650: ALTERNATIVE FUELS FUEL PUMP RELAY CIRCUIT
- Abbreviations
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