Note. To locate components, see COMPONENT LOCATIONS . For circuit reference, see WIRING DIAGRAMS . For connector terminal identification, see CONNECTOR IDENTIFICATION . For intermittent conditions, see INTERMITTENT CONDITIONS . If testing requires component removal or replacement, see appropriate REMOVAL & INSTALLATION article.
Home/Chevrolet/Silverado 1500 HD/Chevrolet Silverado 1500 HD (2001-2006)/Repair manual/Testing & Diagnostics/DTC P2120: APP SENSOR 1 SIGNAL OR APP SENSOR 5-VOLT REFEREN…
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls - Basic Diagnostic Procedures - 4.3L: Overview
- Engine Controls - Basic Diagnostic Procedures - 4.3L: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 4.3L: Other
- Engine Controls - Basic Diagnostic Procedures - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline Engines: Overview
- Engine Controls - Basic Diagnostic Procedures - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline Engines: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline Engines: Other
- Engine Controls - Basic Diagnostic Procedures - 6.0L W/bifuel & Cng Engines: Overview
- Engine Controls - Basic Diagnostic Procedures - 6.0L W/bifuel & Cng Engines: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 6.0L W/bifuel & Cng Engines: Other
- Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel: Overview
- Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel: Other
- Engine Controls - Basic Diagnostic Procedures - 8.1L: Overview
- Engine Controls - Basic Diagnostic Procedures - 8.1L: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 8.1L: Other
- Engine Controls - Trouble Shooting - No Codes - 4.3L: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 4.3L: Wiring
- Engine Controls - Trouble Shooting - No Codes - 4.3L: NVH
- Engine Controls - Trouble Shooting - No Codes - 4.3L: Other
- Engine Controls - Trouble Shooting - No Codes - 4.8L, 5.3L & 6.0L: Overview
- Engine Controls - Trouble Shooting - No Codes - 4.8L, 5.3L & 6.0L: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 4.8L, 5.3L & 6.0L: Wiring
- Engine Controls - Trouble Shooting - No Codes - 4.8L, 5.3L & 6.0L: NVH
- Engine Controls - Trouble Shooting - No Codes - 4.8L, 5.3L & 6.0L: Other
- Engine Controls - Trouble Shooting - No Codes - 6.0L W/bifuel & Cng: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 6.0L W/bifuel & Cng: Wiring
- Engine Controls - Trouble Shooting - No Codes - 6.0L W/bifuel & Cng: NVH
- Engine Controls - Trouble Shooting - No Codes - 6.0L W/bifuel & Cng: Other
- Engine Controls - Trouble Shooting - No Codes - 6.6L: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 6.6L: Wiring
- Engine Controls - Trouble Shooting - No Codes - 6.6L: NVH
- Engine Controls - Trouble Shooting - No Codes - 6.6L: Other
- Engine Controls - Trouble Shooting - No Codes - 8.1L: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 8.1L: Wiring
- Engine Controls - Trouble Shooting - No Codes - 8.1L: NVH
- Engine Controls - Trouble Shooting - No Codes - 8.1L: Other
- Engine Controls - System & Component Testing - 4.3: Specifications
- Engine Controls - System & Component Testing - 4.3: Overview
- Engine Controls - System & Component Testing - 4.3: Diagnosis
- Engine Controls - System & Component Testing - 4.3: Wiring
- Engine Controls - System & Component Testing - 4.3: Component Locations
- Engine Controls - System & Component Testing - 4.3: Other
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Specifications
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Overview
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Diagnosis
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Wiring
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Component Locations
- Engine Controls - System & Component Testing - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Other
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Specifications
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Overview
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Diagnosis
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Wiring
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Component Locations
- Engine Controls - System & Component Testing - 6.0L W/bifuel & Cng: Other
- Engine Controls - System & Component Testing - 6.6L: Specifications
- Engine Controls - System & Component Testing - 6.6L: Overview
- Engine Controls - System & Component Testing - 6.6L: Diagnosis
- Engine Controls - System & Component Testing - 6.6L: Wiring
- Engine Controls - System & Component Testing - 6.6L: Component Locations
- Engine Controls - System & Component Testing - 6.6L: Other
- Engine Controls - System & Component Testing - 8.1L: Specifications
- Engine Controls - System & Component Testing - 8.1L: Overview
- Engine Controls - System & Component Testing - 8.1L: Diagnosis
- Engine Controls - System & Component Testing - 8.1L: Wiring
- Engine Controls - System & Component Testing - 8.1L: Component Locations
- Engine Controls - System & Component Testing - 8.1L: Other
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Overview
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Diagnosis
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Maintenance
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Wiring
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: Component Locations
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: NVH
- Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline: 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 SYSTEM PERFORMANCE
- 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 P0116: ECT SENSOR PERFORMANCE
- DTC P0117: ECT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ECT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0120: TP SENSOR CIRCUIT
- DTC P0125: EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL
- DTC P0128: ECT LESS THAN THERMOSTAT REGULATING TEMPERATURE
- DTC P0131: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 1 & DTC P0151: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 1
- DTC P0132: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 1 & DTC P0152: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 1
- DTC P0133: HO2S CIRCUIT - SLOW RESPONSE - BANK 1, SENSOR 1 & DTC P0153: HO2S CIRCUIT - SLOW RESPONSE - BANK 2, SENSOR 1
- DTC P0134: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1, SENSOR 1 & DTC P0154: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 2, SENSOR 1
- DTC P0135: HO2S HEATER CIRCUIT - BANK 1, SENSOR 1 & DTC P0155: HO2S HEATER CIRCUIT - BANK 2, SENSOR 1
- DTC P0137: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 2 & DTC P0157: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 2
- DTC P0138: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 2 & DTC P0158: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 2
- DTC P0140: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1, SENSOR 2 & DTC P0160: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 2, SENSOR 2
- DTC P0141: HO2S HEATER CIRCUIT - BANK 1, SENSOR 2 & DTC P0161: HO2S HEATER CIRCUIT - BANK 2, SENSOR 2
- DTC P0169: FUEL COMPOSITION SENSOR - HIGH ALCOHOL CONTENT DETECTED (5.3L FLEX-FUEL)
- DTC P0171: FUEL TRIM SYSTEM LEAN - BANK 1 & DTC P0174: FUEL TRIM SYSTEM LEAN - BANK 2
- DTC P0172: FUEL TRIM SYSTEM RICH - BANK 1 & DTC P0175: FUEL TRIM SYSTEM RICH - BANK 2
- DTC P0178: FUEL COMPOSITION SENSOR CIRCUIT LOW VOLTAGE (5.3L FLEX-FUEL)
- DTC P0179: FUEL COMPOSITION SENSOR CIRCUIT HIGH VOLTAGE (5.3L FLEX-FUEL)
- DTC P0200: FUEL INJECTOR CONTROL CIRCUIT
- DTC P0220: THROTTLE POSITION SENSOR 2 CIRCUIT
- DTC P0230: FUEL PUMP CONTROL RELAY CIRCUIT
- DTC P0300: ENGINE MISFIRE DETECTED
- DTC P0315: CRANKSHAFT POSITION SENSOR VARIATION NOT LEARNED
- DTC P0325: KNOCK SENSOR MODULE CIRCUIT
- DTC P0327: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 1 & DTC P0332: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 2
- DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT
- DTC P0336: CRANKSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0342: CAMSHAFT POSITION SENSOR - SIGNAL LOW
- DTC P0343: CAMSHAFT POSITION SENSOR - SIGNAL HIGH
- DTC P0351-P0358: IGNITION CONTROL CIRCUIT
- DTC P0420: TWC SYSTEM - LOW EFFICIENCY - BANK 1 & DTC P0430: TWC SYSTEM - LOW EFFICIENCY - BANK 2
- DTC P0442: EVAP SYSTEM - SMALL LEAK
- DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT
- DTC P0446: EVAP VENT CONTROL CIRCUIT
- DTC P0449: EVAP VENT SOLENOID VALVE CONTROL CIRCUIT
- DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE
- DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE
- DTC P0455: EVAP SYSTEM LEAK DETECTED - GROSS LEAK/NO FLOW
- DTC P0496: EVAP SYSTEM HIGH PURGE FLOW
- DTC P0506: IDLE CONTROL SYSTEM - LOW RPM
- DTC P0507: IDLE CONTROL SYSTEM - HIGH RPM
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 & P2610: PCM MEMORY
- DTC P0641: 5-VOLT REFERENCE CIRCUIT OUT OF RANGE
- DTC P0650: MIL CONTROL CIRCUIT
- DTC P0651: SENSOR REFERENCE VOLTAGE 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 P1125: ACCELERATOR PEDAL POSITION SENSORS OUT OF RANGE OR DISAGREE
- DTC P1133: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 1, SENSOR 1 & DTC P1153: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 2, SENSOR 1
- DTC P1172: SECONDARY FUEL PUMP TRANSFER MALFUNCTION
- DTC P1258: ENGINE OVER-TEMPERATURE CONDITION
- DTC P1380: EBCM DTC DETECTED ROUGH ROAD DATA UNSTABLE
- DTC P1381: MISFIRE DETECTED - NO EBCM/PCM SERIAL DATA
- DTC P1514: CALCULATED VS ACTUAL AIRFLOW CORRELATION HIGH
- DTC P1515: PREDICTED VS ACTUAL THROTTLE POSITION CORRELATION ERROR
- DTC P1516: PREDICTED VS ACTUAL THROTTLE POSITION CORRELATION ERROR
- DTC P1517: TAC MODULE PROCESSOR FAULT
- DTC P1518: TAC MODULE SERIAL DATA FAULT
- DTC P2108: TAC MODULE PROCESSOR FAULT
- DTC P2120: APP SENSOR 1 CIRCUIT MALFUNCTION
- DTC P2121: APP SENSOR CIRCUITS OUT OF CORRELATION
- DTC P2125: APP SENSOR 2 CIRCUIT MALFUNCTION
- DTC P2135: TP SENSOR SIGNALS 1 & 2 DISAGREE OR OUTSIDE PREDETERMINED RANGE
- Engine Controls - Self Diagnostics - 4.3L: Overview
- Engine Controls - Self Diagnostics - 4.3L: Diagnosis
- Engine Controls - Self Diagnostics - 4.3L: Maintenance
- Engine Controls - Self Diagnostics - 4.3L: Wiring
- Engine Controls - Self Diagnostics - 4.3L: Component Locations
- Engine Controls - Self Diagnostics - 4.3L: NVH
- Engine Controls - Self Diagnostics - 4.3L: Other
- DTC P0016: CRANKSHAFT POSITION-TO-CAMSHAFT POSITION CORRELATION ERROR
- DTC P0101: MASS AIR FLOW SENSOR PERFORMANCE
- DTC P0102: MASS AIR FLOW SENSOR CIRCUIT - LOW FREQUENCY
- DTC P0103: MASS AIR FLOW SENSOR CIRCUIT - HIGH FREQUENCY
- DTC P0106: MAP SYSTEM PERFORMANCE
- DTC P0107: MAP SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0108: MAP SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0113: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR PERFORMANCE
- DTC P0117: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0121: THROTTLE POSITION SENSOR PERFORMANCE
- DTC P0122: THROTTLE POSITION SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0125: EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL
- DTC P0128: ENGINE COOLANT TEMPERATURE LESS THAN THERMOSTAT REGULATING TEMPERATURE
- DTC P0131: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 1 & DTC P0151: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 1
- DTC P0132: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 1 & DTC P0152: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 1
- DTC P0133: HO2S CIRCUIT - SLOW RESPONSE - BANK 1, SENSOR 1 & DTC P0153: HO2S CIRCUIT - SLOW RESPONSE - BANK 2, SENSOR 1
- DTC P0134: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1, SENSOR 1 & DTC P0154: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 2, SENSOR 1
- DTC P0135: HO2S HEATER CIRCUIT - BANK 1, SENSOR 1, DTC P0141: HO2S HEATER CIRCUIT - BANK 1, SENSOR 2, DTC P0155: HO2S HEATER CIRCUIT - BANK 2, SENSOR 1, & DTC P0161: HO2S HEATER CIRCUIT - BANK 2, SENSOR 2
- DTC P0137: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 2 & DTC P0157: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 2
- DTC P0138: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 2 & DTC P0158: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 2
- DTC P0140: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1, SENSOR 2 & DTC P0160: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 2, SENSOR 2
- DTC P0171: FUEL TRIM SYSTEM LEAN - BANK 1 & DTC P0174: FUEL TRIM SYSTEM LEAN - BANK 2
- DTC P0172: FUEL TRIM SYSTEM RICH - BANK 1 & DTC P0175: FUEL TRIM SYSTEM RICH - BANK 2
- DTC P0200: FUEL INJECTOR CONTROL CIRCUIT
- DTC P0230: FUEL PUMP CONTROL RELAY CIRCUIT
- DTC P0300: ENGINE MISFIRE DETECTED
- DTC P0315: CRANKSHAFT POSITION SENSOR VARIATION NOT LEARNED
- DTC P0325: KNOCK SENSOR MODULE CIRCUIT
- DTC P0327: KNOCK SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT
- DTC P0336: CRANKSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0351: IGNITION CONTROL CIRCUIT
- DTC P0420: TWC SYSTEM - LOW EFFICIENCY - BANK 1 & DTC P0430: TWC SYSTEM - LOW EFFICIENCY - BANK 2
- DTC P0442: EVAP SYSTEM - SMALL LEAK
- DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT
- DTC P0446: EVAP VENT VALVE PERFORMANCE
- DTC P0449: EVAP VENT VALVE PERFORMANCE
- DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE
- DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE
- DTC P0455: EVAP SYSTEM LEAK DETECTED - GROSS LEAK/NO FLOW
- DTC P0496: EVAP SYSTEM HIGH PURGE FLOW
- DTC P0506: IDLE CONTROL SYSTEM - RPM LOW
- DTC P0507: IDLE CONTROL SYSTEM - RPM HIGH
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 & P2610: PCM MEMORY
- DTC P0641: 5-VOLT REFERENCE CIRCUIT OUT OF RANGE
- DTC P0650: MALFUNCTION INDICATOR LIGHT CONTROL CIRCUIT
- DTC P0651: A/C PRESSURE SENSOR/FUEL TANK PRESSURE SENSOR 5-VOLT REFERENCE CIRCUIT OUT OF RANGE
- DTC P1106: MAP SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE
- DTC P1107: MAP SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE
- DTC P1111: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - INTERMITTENT HIGH VOLTAGE
- DTC P1112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - INTERMITTENT LOW VOLTAGE
- DTC P1114: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - INTERMITTENT LOW VOLTAGE
- DTC P1115: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - INTERMITTENT HIGH VOLTAGE
- DTC P1121: THROTTLE POSITION SENSOR CIRCUIT - INTERMITTENT HIGH VOLTAGE
- DTC P1122: THROTTLE POSITION SENSOR CIRCUIT - INTERMITTENT LOW VOLTAGE
- DTC P1133: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 1, SENSOR 1 & DTC P1153: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 2, SENSOR 1
- DTC P1258: ENGINE OVER-TEMPERATURE CONDITION
- DTC P1380: EBCM DTC DETECTED - ROUGH ROAD DATA UNSTABLE
- DTC P1381: MISFIRE DETECTED - NO EBCM/PCM SERIAL DATA
- Engine Controls - Self Diagnostics - 8.1L: Overview
- Engine Controls - Self Diagnostics - 8.1L: Diagnosis
- Engine Controls - Self Diagnostics - 8.1L: Maintenance
- Engine Controls - Self Diagnostics - 8.1L: Wiring
- Engine Controls - Self Diagnostics - 8.1L: Component Locations
- Engine Controls - Self Diagnostics - 8.1L: NVH
- Engine Controls - Self Diagnostics - 8.1L: Other
- DTC P0101: MASS AIR FLOW SENSOR PERFORMANCE
- DTC P0102: MASS AIR FLOW SENSOR CIRCUIT - LOW FREQUENCY
- DTC P0103: MASS AIR FLOW SENSOR CIRCUIT - HIGH FREQUENCY
- DTC P0106: MAP SYSTEM PERFORMANCE
- 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 P0116: ECT SENSOR PERFORMANCE (SIERRA & SILVERADO)
- DTC P0116: ECT SENSOR PERFORMANCE (AVALANCHE, SUBURBAN & YUKON XL)
- DTC P0117: ECT SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ECT SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0120: TP SENSOR CIRCUIT
- DTC P0125: EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL (SIERRA & SILVERADO)
- DTC P0128: ECT LESS THAN THERMOSTAT REGULATING TEMPERATURE (SIERRA & SILVERADO)
- DTC P0131: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 1 & DTC P0151: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 1
- DTC P0132: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 1 & DTC P0152: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 1
- DTC P0133: HO2S CIRCUIT - SLOW RESPONSE - BANK 1, SENSOR 1 & DTC P0153: HO2S CIRCUIT - SLOW RESPONSE - BANK 2, SENSOR 1
- DTC P0134 & P0154: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1 & 2, SENSOR 1
- DTC P0135: HO2S HEATER CIRCUIT - BANK 1, SENSOR 1, DTC P0141: HO2S HEATER CIRCUIT - BANK 1, SENSOR 2, DTC P0155: HO2S HEATER CIRCUIT - BANK 2, SENSOR 1 & DTC P0161: HO2S HEATER CIRCUIT - BANK 2, SENSOR 2
- DTC P0137: HO2S CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 2 & DTC P0157: HO2S CIRCUIT - LOW VOLTAGE - BANK 2, SENSOR 2
- DTC P0138: HO2S CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 2 & DTC P0158: HO2S CIRCUIT - HIGH VOLTAGE - BANK 2, SENSOR 2
- DTC P0140: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 1, SENSOR 2 & DTC P0160: HO2S CIRCUIT - INSUFFICIENT ACTIVITY - BANK 2, SENSOR 2
- DTC P0171: FUEL TRIM SYSTEM LEAN - BANK 1 & DTC P0174: FUEL TRIM SYSTEM LEAN - BANK 2
- DTC P0172: FUEL TRIM SYSTEM RICH - BANK 1 & DTC P0175: FUEL TRIM SYSTEM RICH - BANK 2
- DTC P0200: FUEL INJECTOR CONTROL CIRCUIT
- DTC P0220: THROTTLE POSITION SENSOR 2 CIRCUIT
- DTC P0230: FUEL PUMP CONTROL RELAY CIRCUIT
- DTC P0300: ENGINE MISFIRE DETECTED
- DTC P0325: KNOCK SENSOR MODULE CIRCUIT
- DTC P0327: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 1 & DTC P0332: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 2
- DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT
- DTC P0336: CRANKSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0342: CAMSHAFT POSITION SENSOR SIGNAL LOW
- DTC P0343: CAMSHAFT POSITION SENSOR SIGNAL HIGH
- DTC P0351-P0358: IGNITION CONTROL CIRCUIT
- DTC P0420: : TWC SYSTEM - LOW EFFICIENCY - BANK 1 & DTC P0430: TWC SYSTEM - LOW EFFICIENCY - BANK 2
- DTC P0442: EVAP SYSTEM - SMALL LEAK
- DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT
- DTC P0446: EVAP VENT VALVE PERFORMANCE
- DTC P0449: EVAP VENT VALVE PERFORMANCE
- DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE
- DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE
- DTC P0455: EVAP SYSTEM LEAK DETECTED - GROSS LEAK/NO FLOW
- DTC P0496: EVAP SYSTEM HIGH PURGE FLOW
- DTC P0506: IDLE CONTROL SYSTEM - RPM LOW & DTC P0507: IDLE CONTROL SYSTEM - RPM HIGH
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 & P2610: PCM MEMORY
- DTC P0650: MALFUNCTION INDICATOR LAMP CONTROL CIRCUIT
- DTC P1111: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - INTERMITTENT HIGH VOLTAGE
- DTC P1112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - INTERMITTENT LOW VOLTAGE
- DTC P1114: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - INTERMITTENT LOW VOLTAGE
- DTC P1115: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - INTERMITTENT HIGH VOLTAGE
- DTC P1125: ACCELERATOR PEDAL POSITION SENSORS OUT OF RANGE OR DISAGREE
- DTC P1133: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 1, SENSOR 1 & DTC P1153: HO2S CIRCUIT - INSUFFICIENT SWITCHING - BANK 2, SENSOR 1
- DTC P1172: SECONDARY FUEL PUMP TRANSFER MALFUNCTION
- DTC P1258
- DTC P1380: EBCM DTC DETECTED ROUGH ROAD DATA UNSTABLE
- DTC P1381: MISFIRE DETECTED - NO EBCM/PCM SERIAL DATA
- DTC P1404: EGR VALVE CLOSED PINTLE POSITION
- DTC P1514: AIRFLOW RATE EXCESSIVE
- DTC P1515: PREDICTED VS ACTUAL THROTTLE POSITION CORRELATION ERROR
- DTC P1516: PREDICTED VS ACTUAL THROTTLE POSITION CORRELATION ERROR
- DTC P1518: THROTTLE ACTUATOR CONTROL MODULE SERIAL DATA FAULT
- DTC P2108: THROTTLE ACTUATOR CONTROL MODULE CIRCUIT FAULT
- DTC P2120: APP SENSOR 1 SIGNAL OR APP SENSOR 5-VOLT REFERENCE OUT OF RANGE
- DTC P2121: APP SENSOR 1 SIGNAL AND APP SENSOR 2 SIGNAL CIRCUITS OUT OF CORRELATION
- DTC P2125: APP SENSOR 2 SIGNAL OR APP SENSOR 5-VOLT REFERENCE OUT OF RANGE
- DTC P2135: TP SENSORS NO. 1 & 2 SIGNALS DISAGREE OR SIGNAL VOLTAGES OUT OF RANGE
- Engine Controls - Self Diagnostics - 6.6L: Overview
- Engine Controls - Self Diagnostics - 6.6L: Diagnosis
- Engine Controls - Self Diagnostics - 6.6L: Maintenance
- Engine Controls - Self Diagnostics - 6.6L: Wiring
- Engine Controls - Self Diagnostics - 6.6L: Component Locations
- Engine Controls - Self Diagnostics - 6.6L: NVH
- Engine Controls - Self Diagnostics - 6.6L: Other
- DTC P0016: CAMSHAFT POSITION SENSOR/CRANKSHAFT POSITION SENSOR CORRELATION ERROR
- DTC P0087: FUEL RAIL PRESSURE LOW
- DTC P0088: FUEL RAIL PRESSURE HIGH
- DTC P0089: FUEL RAIL PRESSURE SENSOR INDICATING FUEL PRESSURE HIGHER THAN DESIRED
- DTC P0090: FUEL RAIL PRESSURE SENSOR CURRENT OUT OF RANGE
- DTC P0101: MASS AIR FLOW SENSOR PERFORMANCE
- DTC P0102: MASS AIR FLOW SENSOR CIRCUIT - LOW FREQUENCY
- DTC P0103: MASS AIR FLOW SENSOR CIRCUIT - HIGH FREQUENCY
- DTC P0112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0113: INTAKE AIR TEMPERATURE 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 TEMPERATURE SENSOR HIGH
- DTC P0181: FUEL TEMPERATURE SENSOR & INTAKE AIR TEMPERATURE SENSOR TEMPERATURE NOT WITHIN SPECIFICATION
- DTC P0182: FUEL TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0183: FUEL 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: TURBOCHARGER ENGINE OVERBOOST CONDITION - CALIFORNIA RPO YF5, NE1
- DTC P0234: TURBOCHARGER ENGINE OVERBOOST CONDITION - FEDERAL RPO FE9, NG1
- DTC P0236: TURBOCHARGER BOOST SYSTEM - CALIFORNIA RPO YF5, NE1
- DTC P0236: TURBOCHARGER BOOST SYSTEM - FEDERAL RPO FE9, NG1
- DTC P0237: TURBOCHARGER BOOST SENSOR CIRCUIT LOW VOLTAGE - CALIFORNIA RPO YF5, NE1
- DTC P0237: TURBOCHARGER BOOST SENSOR CIRCUIT LOW VOLTAGE- FEDERAL RPO FE9, NG1
- DTC P0238: TURBOCHARGER BOOST SENSOR CIRCUIT HIGH VOLTAGE - CALIFORNIA RPO YF5, NE1
- DTC P0238: TURBOCHARGER BOOST SENSOR CIRCUIT HIGH VOLTAGE - FEDERAL RPO FE9, NG1
- 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: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCE
- DTC P0370 & P0374: TIMING REFERENCE HIGH RESOLUTION
- DTC P0380: GLOW PLUG CIRCUIT PERFORMANCE - CALIFORNIA RPO YF5, NE1
- DTC P0380: GLOW PLUG CIRCUIT PERFORMANCE - FEDERAL RPO FE9, NG1
- 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 P0540: INTAKE AIR HEATER - INCORRECT VOLTAGE
- DTC P0543: INTAKE AIR HEATER - INCORRECT VOLTAGE
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 & P2610: ECM MEMORY
- DTC P0611: FUEL INJECTION CONTROL MODULE INTERNAL FAULT
- DTC P0612: FUEL INJECTION CONTROL MODULE INTERNAL FAULT
- DTC P0641: 5-VOLT REFERENCE CIRCUIT OUT OF RANGE
- DTC P0650: MIL CONTROL CIRCUIT
- DTC P0651: SENSOR REFERENCE VOLTAGE "B" CIRCUIT/OPEN
- DTC P0700: TCM MIL REQUEST
- DTC P0802: TRANSMISSION CONTROL SYSTEM MIL REQUEST CIRCUIT OPEN
- 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 MALFUNCTION
- DTC P1223, P1226, P1229, P1232, P1235, P1238, P1241 & P1244: INCORRECT VOLTAGE FOR COMMANDED STATE OF INJECTOR DRIVER
- DTC P1258: ENGINE OVER-TEMPERATURE CONDITION
- DTC P1270: ACCELERATOR PEDAL POSITION SENSOR A/D CONVERTER ERROR
- DTC P1404: EGR VALVE CLOSED PINTLE POSITION
- DTC P1550: FUEL INJECTOR CONTROL MODULE - LOW VOLTAGE
- DTC P1658: FUEL INJECTOR CONTROL MODULE DRIVER CIRCUITS
- DTC P2122: ACCELERATOR PEDAL POSITION SENSOR NO. 1 LOW VOLTAGE
- DTC P2123: ACCELERATOR PEDAL POSITION SENSOR NO. 1 HIGH VOLTAGE
- DTC P2127: ACCELERATOR PEDAL POSITION SENSOR NO. 2 LOW VOLTAGE
- DTC P2128: ACCELERATOR PEDAL POSITION SENSOR NO. 2 HIGH VOLTAGE
- DTC P2132: ACCELERATOR PEDAL POSITION SENSOR NO. 3 LOW VOLTAGE
- DTC P2133: ACCELERATOR PEDAL POSITION SENSOR NO. 3 HIGH VOLTAGE
- DTC P2138: ACCELERATOR PEDAL POSITION SENSORS NO. 1 & 2 CORRELATION ERROR
- DTC P2139: ACCELERATOR PEDAL POSITION SENSORS NO. 2 & 3 CORRELATION ERROR
- DTC P2140: ACCELERATOR PEDAL POSITION SENSORS NO. 1 & 3 CORRELATION ERROR
- 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 THROTTLE VALVE VACUUM CONTROL SOLENOID CIRCUIT - HIGH VOLTAGE
- DTC P2145: EGR VACUUM VENT SOLENOID CONTROL CIRCUIT - HIGH VOLTAGE
- DTC P2146: FUEL INJECTOR CIRCUIT CONDITION - CYLINDER NO. 1, 4, 6, OR 7
- DTC P2149: FUEL INJECTOR CIRCUIT CONDITION - CYLINDER NO. 2, 3, 5, OR 8
- DTC P2227: BAROMETRIC PRESSURE SENSOR/EGR VACUUM SENSOR CORRELATION ERROR - CALIFORNIA RPO YF5, NE1
- DTC P2227: BAROMETRIC PRESSURE SENSOR/BOOST SENSOR CORRELATION ERROR - FEDERAL RPO FE9, NG1
- DTC P2228: BAROMETRIC PRESSURE SENSOR SIGNAL LOW - CALIFORNIA RPO YF5, NE1
- DTC P2228: BAROMETRIC PRESSURE SENSOR SIGNAL LOW - FEDERAL RPO FE9, NG1
- DTC P2229: BAROMETRIC PRESSURE SENSOR SIGNAL HIGH - CALIFORNIA RPO YF5, NE1
- DTC P2229: BAROMETRIC PRESSURE SENSOR SIGNAL HIGH - FEDERAL RPO FE9, NG1
- DTC P2279: AIR INTAKE LEAK DETECTED
- 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 P0005: FUEL SHUTOFF VALVE "A" CONTROL CIRCUIT/OPEN
- DTC P0148: FUEL DELIVERY ERROR
- DTC P0171: FUEL TRIM SYSTEM LEAN - BANK 1 & DTC P0174: FUEL TRIM SYSTEM LEAN - BANK 2
- DTC P0172: FUEL TRIM SYSTEM RICH - BANK 1 & 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 P0191: FUEL RAIL PRESSURE SENSOR CIRCUIT PERFORMANCE
- DTC P0192: FUEL RAIL PRESSURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0193: FUEL RAIL PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0200: INJECTOR CONTROL CIRCUIT VOLTAGE
- DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED
- DTC P0611: FUEL INJECTOR CONTROL MODULE PERFORMANCE
- DTC P1020: INCORRECT VOLTAGE ON A CNG FUEL INJECTOR CONTROL CIRCUIT
- DTC P1021-P1028: INCORRECT VOLTAGE ON A CNG FUEL INJECTOR CONTROL CIRCUIT
- DTC P1204: VEHICLE DOES NOT START ON CNG
- DTC P1207: FUEL RAIL PRESSURE OUTPUT PWM SIGNAL NOT RECEIVED BY PCM
- DTC P1209: FICM DIAGNOSTIC OUTPUT PWM SIGNAL NOT RECEIVED BY PCM
- DTC P1432: FUEL TANK PRESSURE SENSOR SIGNAL LOW
- DTC P1433: FUEL PRESSURE SENSOR SIGNAL HIGH
- DTC P2146: INCORRECT VOLTAGE DETECTED - COMMAND STATE OF AFO ENABLE CIRCUIT
- DTC P2665: INCORRECT VOLTAGE DETECTED - LOW PRESSURE LOCK-OFF SOLENOID
- Abbreviations
- Accessories Control Systems
- Accessory Drive Belts
- Adjustments
- Airbag
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- Application
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