Chevrolet Cobalt Service & Repair Manual: Diagnosis & Testing

Chevrolet Cobalt Service & Repair Manual / Engine Management / Fuel Injection / Diagnosis & Testing

Accessing Diagnostic Trouble Codes

Connect a suitably programmed scan tool to Diagnostic Link Connector (DLC) and follow manufacturer's instructions.

Wiring Diagrams

Refer to "Wiring Diagrams" on main menu selection for diagram selections.

Diagnostic Tests

Code Description Fig.No.
-- Diagnostic System Check 1
-- Fuel Injector Balance Test 2
-- Fuel Injector Solenoid Coil Test 3
-- Ignition System Diagnosis 4
-- Intermittents 5
P0008 Engine Position System Performance Bank 1 6
P0009 Engine Position System Performance Bank 2 7
P0010 CMP Actuator Circuit 8
P0011 CMP Actuator Circuit 9
P0013 CMP Actuator Circuit 8
P0014 CMP Actuator Circuit 9
P0016 CKP & CMP Correlation 10
P0017 CKP & CMP Correlation 10
P0018 CKP & CMP Correlation 10
P0019 CKP & CMP Correlation 10
P0020 CMP Actuator Circuit 8
P0021 CMP Actuator Circuit 9
P0023 CMP Actuator Circuit 8
P0024 CMP Actuator Circuit 9
P0030 HO2S Control Circuit 11
P0031 HO2S Heater Control Circuit 12
P0032 HO2S Heater Control Circuit 13
P0033 Supercharger Bypass Valve Solenoid Control Circuit 14
P0036 HO2S Control Circuit 11
P0037 HO2S Heater Control Circuit 12
P0038 HO2S Heater Control Circuit 13
P0050 HO2S Heater Control Circuit Bank 2 Sensor 1 15
P0053 HO2S Control Circuit 11
P0054 HO2S Control Circuit 11
P0056 HO2S Heater Control Circuit 16
P0057 HO2S Heater Control Circuit Low Voltage 17
P0058 HO2S Heater Control Circuit High Voltage 18
P0059 HO2S Heater Control Circuit Bank 2 15
P0060 HO2S Heater Resistance Bank 2 19
P0068 Throttle Body Airflow Performance 20
P0069 Supercharger Inlet Pressure- Barometric Pressure Correlation 21
P0096 IAT Sensor 2 Performance 22
P0097 IAT Sensor 2 23
P0098 IAT Sensor 2 23
P0101 MAF Sensor Performance 24
P0102 MAF Sensor Circuit Low/High Frequency 25
P0103 MAF Sensor Circuit Low/High Frequency 25
P0106 MAP Sensor Performance 26
P0107 MAP Sensor Circuit Voltage 27
P0108 MAP Sensor Circuit Voltage 27
P0110 IAT Sensor Circuit 28
P0111 IAT Sensor Circuit Performance 29
P0112 IAT Sensor Circuit Low Voltage 30
P0113 IAT Sensor Circuit High Voltage 30
P0116 ECT Sensor Performance 31
P0117 ECT Sensor Circuit Low Voltage 32
P0118 ECT Sensor Circuit High Voltage 32
P0119 ECT Sensor Circuit Intermittent 33
P012B Supercharger Inlet Pressure Sensor Performance 34
P012C Supercharger Inlet Pressure Sensor Circuit Voltage 35
P012D Supercharger Inlet Pressure Sensor Circuit Voltage 35
P0120 Throttle Position Sensor 1 Circuit 36
P0121 TP Sensor 1 Performance 37
P0122 TP Sensor 1 Circuit Low Voltage 38
P0123 TP Sensor 1 Circuit High Voltage 39
P0125 ECT Insufficient for Closed Loop Fuel Control 40
P0126 ECT Insufficient For Closed Loop Fuel Control 41
P0128 ECT Below Thermostat Regulating Temperature 42
P0130 HO2S Circuit Sensor 1 43
P0131 HO2S Circuit Voltage 44
P0132 HO2S Circuit Voltage 44
P0133 HO2S Slow Response Sensor 1 45
P0134 HO2S Slow Response Sensor 1 45
P0135 HO2S Control Circuit 11
P0136 HO2S Circuit Malfunction 46
P0137 HO2S Circuit Voltage 44
P0138 HO2S Circuit Voltage 44
P0139 HO2S Slow Response Sensor 2 47
P0140 HO2S Circuit Voltage 44
P0141 HO2S Control Circuit 11
P0150 HO2S Circuit Bank 2 48
P0151 HO2S Circuit Voltage Bank 2 49
P0152 HO2S Circuit Voltage Bank 2 49
P0153 HO2S Circuit Bank 2-Sensor 1 50
P0154 HO2S Circuit Bank 2-Sensor 1 50
P0155 HO2S Heater Control Circuit Bank 2 Sensor 1 15
P0157 HO2S Circuit Bank 2 Low Voltage 51
P0158 HO2S Circuit Bank 2 High Voltage 52
P0160 HO2S Circuit Insufficient Activity Bank 2 53
P0161 HO2S Heater Performance Bank 54
P0171 Fuel Trim System Lean/Rich 55
P0172 Fuel Trim System Lean/Rich 55
P0174 Fuel Trim System Lean/Rich 55
P0175 Fuel Trim System Lean/Rich 55
P0196 Engine Oil Temperature Sensor Performance 56
P0197 Engine Oil Temperature Sensor Circuit Voltage 57
P0198 Engine Oil Temperature Sensor Circuit Voltage 57
P0201 Injector No. 1 Control Circuit 58
P0202 Injector No. 2 Control Circuit 58
P0203 Injector No. 3 Control Circuit 58
P0204 Injector No. 4 Control Circuit 58
P0205 Injector No. 5 Control Circuit 58
P0206 Injector No. 6 Control Circuit 58
P0207 Injector No. 7 Control Circuit 58
P0208 Injector No. 8 Control Circuit 58
P0217 Engine Coolant Over Temperature 59
P0220 Throttle Position Sensor 2 Circuit 60
P0221 TP Sensor 2 Performance 61
P0222 TP Sensor 2 Circuit Low Voltage 62
P0223 TP Sensor 2 Circuit High Voltage 63
P023A Charge Air Cooler Coolant Pump Relay Control Circuit 64
P0230 Fuel Pump Relay Control Circuit 65
P0261 Injector Control Circuit Low Voltage 66
P0262 Injector Control Circuit High Voltage 67
P0264 Injector Control Circuit Low Voltage 66
P0265 Injector Control Circuit High Voltage 67
P0267 Injector Control Circuit Low Voltage 66
P0268 Injector Control Circuit High Voltage 67
P0270 Injector Control Circuit Low Voltage 66
P0271 Injector Control Circuit High Voltage 67
P0273 Injector Control Circuit Low Voltage 66
P0274 Injector Control Circuit High Voltage 67
P0276 Injector Control Circuit Low Voltage 66
P0277 Injector Control Circuit High Voltage 67
P0300 Engine Misfire Detected 68
P0301 Cylinder No. 1 Misfire Detected 69
P0302 Cylinder No. 2 Misfire Detected 69
P0303 Cylinder No. 3 Misfire Detected 69
P0304 Cylinder No. 4 Misfire Detected 69
P0305 Cylinder No. 5 Misfire Detected 69
P0306 Cylinder No. 6 Misfire Detected 69
P0307 Cylinder No. 7 Misfire Detected 69
P0308 Cylinder No. 8 Misfire Detected 69
P0313 Misfire Detected With Low Fuel Level 70
P0314 Single Cylinder Engine Misfire Detected 71
P0315 CKP System Variation Not Learned 72
P0318 Rough Road Sensor Circuit 73
P0324 Knock Sensor Module Performance 74
P0325 Knock Sensor Circuit 75
P0326 Knock Sensor Circuit 75
P0327 Knock Sensor Circuit 75
P0328 Knock Sensor Circuit High Voltage 76
P0330 Knock Sensor Circuit 77
P0332 Knock Sensor Circuit 77
P0333 Knock Sensor Circuit High Voltage 76
P0335 CKP Sensor Circuit 78
P0336 CKP Sensor Performance 79
P0338 CKP Sensor Circuit High Duty Cycle 80
P0340 CMP Sensor Circuit 81
P0341 Intake CMP Sensor Performance 82
P0342 Intake CMP Sensor Circuit Low Voltage 83
P0343 Intake CMP Sensor Circuit High Voltage 84
P0345 CMP Sensor Circuit 85
P0346 Intake CMP Sensor Performance 82
P0347 Intake CMP Sensor Circuit Low Voltage 83
P0348 Intake CMP Sensor Circuit High Voltage 84
P0350 Ignition Coil Control Circuit 86
P0351 Ignition Coil Control Circuit 87
P0352 Ignition Coil Control Circuit 87
P0353 Ignition Coil Control Circuit 87
P0354 Ignition Coil Control Circuit 87
P0355 Ignition Coil Control Circuit 87
P0356 Ignition Coil Control Circuit 87
P0357 Ignition Coil Control Circuit 87
P0358 Ignition Coil Control Circuit 87
P0365 CMP Sensor Circuit 85
P0366 Intake CMP Sensor Performance 82
P0367 Intake CMP Sensor Circuit Low Voltage 83
P0368 Intake CMP Sensor Circuit High Voltage 84
P0385 CKP Sensor "B" Circuit 88
P0386 CKP Sensor "B" Performance 89
P0390 CMP Sensor Circuit 85
P0391 Intake CMP Sensor Performance 82
P0392 Intake CMP Sensor Circuit Low Voltage 83
P0393 Intake CMP Sensor Circuit High Voltage 84
P0400 EGR Flow Insufficient/Excessive 90
P0401 EGR Flow Insufficient 91
P0402 EGR Flow Insufficient/Excessive 90
P0403 EGR Solenoid Control Circuit 92
P0404 EGR Open Position Performance 93
P0405 EGR Position Sensor Circuit Low Voltage 94
P0406 EGR Position Sensor Circuit High Voltage 95
P0411 Secondary Air Injection System Incorrect Air Flow Detected 96
P0412 Secondary Air Injection Solenoid Control Circuit 97
P0418 Secondary Air Injection Solenoid Control Circuit 97
P0420 Catalyst System Low Efficiency 98
P0430 Catalyst System Low Efficiency 99
P0442 EVAP System Small Leak Detected 100
P0443 EVAP Purge Solenoid Control Circuit 101
P0446 EVAP Vent System Performance 102
P0449 EVAP Vent Solenoid Control Circuit 103
P0451 Fuel Tank Pressure Sensor Performance 104
P0452 Fuel Tank Pressure Sensor Circuit Low Voltage 105
P0453 Fuel Tank Pressure Sensor Circuit High Voltage 106
P0454 Fuel Tank Pressure Sensor Circuit Intermittent 107
P0455 EVAP System Large Leak Detected 108
P0456 EVAP System Very Small Leak Detected 109
P0458 EVAP Purge Solenoid Control Circuit Low Voltage 110
P0459 EVAP Purge Solenoid Control Circuit High Voltage 111
P0496 EVAP System Flow During Non-Purge 112
P0498 EVAP Vent Solenoid Control Circuit Low Voltage 113
P0499 EVAP Vent Solenoid Control Circuit High Voltage 114
P050B Ignition Timing Performance 115
P0502 Vehicle Speed Sensor Circuit 116
P0506 Idle Speed High Or Low 117
P0507 Idle Speed High Or Low 117
P0556 Brake Booster Pressure Sensor 118
P0557 Brake Booster Pressure Sensor 118
P0558 Brake Booster Pressure Sensor 118
P060D ECM/PCM 119
P0601 ECM 120
P0602 ECM 120
P0603 ECM 120
P0604 ECM 120
P0605 ECM 120
P0606 ECM 120
P0607 ECM 120
P061B Control Module Torque Performance 121
P062F ECM/PCM 119
P0627 Fuel Pump Relay Control Circuit 122
P0628 Fuel Pump Relay Control Circuit Low Voltage 123
P0629 Fuel Pump Relay Control Circuit High Voltage 124
P0630 VIN Not Programmed or Mismatched - ECM 125
P0638 Throttle Actuator Control Command Performance 126
P0641 5-Volt Reference Circuit 127
P0650 MIL Lamp Control Circuit 128
P0651 5-Volt Reference Circuit 127
P0660 Intake Manifold Tuning Valve Solenoid Control Circuit 129
P0685 Engine Controls Ignition Relay Control Circuit 130
P0686 Engine Controls Ignition Relay Control Circuit 130
P0687 Engine Controls Ignition Relay Control Circuit 130
P0689 Engine Controls Ignition Relay Control Circuit 130
P0690 Engine Controls Ignition Relay Control Circuit 130
P0700 TCM Requested MIL Illumination 131
P0864 TCM Communication Circuit Performance 132
P1011 CMP Actuator Park Position
Precautions
Air Bag Systems Refer to "Air Bag System Precautions" on main menu selection for "Precautions." Battery Ground Cable Prior to service, disconnect battery ...

See also:

Chevrolet Cobalt Service & Repair Manual. Pinpoint Test
Ensure battery voltage is greater than 12 volts prior to and during pinpoint test. Caution: Do not have a battery charger attached during vehicle testing. Warning: Never use electrical test equipment on any circuit related to the SRS unless instructed by ...

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