Diagnostic Trouble Code (DTC) List. Buick Century 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Diagnostic Trouble Code (DTC) List

The service information contained in this manual refers to the Federal calibration package. The export change is NOT reflected in the service information on the DTC's diagnostic support information page or in the Repair Instructions. The DTC Type table information refers to domestic and Export calibration packages. Export vehicles may have differences in DTC types that will affect Malfunction Indicator Lamp (MIL) operation. Certain DTCs have been changed from type A to type C or, in some cases, type X. When a type A diagnostic fails, a DTC is set immediately and the Malfunction Indicator Lamp (MIL) is illuminated. When a type B DTC diagnostic fails, the Malfunction Indicator Lamp (MIL) will illuminate if the fault is present after two consecutive drive trips. A type C DTC will set after one failure and be stored in history but will not illuminate the Malfunction Indicator Lamp (MIL). Type X DTCs have been turned off (the diagnostic does not run, no codes are stored, and the Malfunction Indicator Lamp (MIL) will not illuminate.

If a system is malfunctioning and the associated DTC has been disabled (Type X), it may be beneficial to use the diagnostic table as a guide to aid in diagnosis. Many of the DTC tables include a functional check of the system that may pinpoint a problem. However, it is important to remember that the DTC tables are specifically designed for use only when a DTC is set. Therefore, a thorough understanding of the normal operation of the system being diagnosed is necessary and use of the tables for this purpose is at the discretion of the technician.

Important: An export vehicle may have unrequired emissions components removed.

PCM Diagnostic Trouble Codes

Description	Domestic RPO LA1	Export Unleaded RPO LA1	Export Leaded
DTC P0101 Mass Air Flow (MAF) Sensor Performance	B	B	--
DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency	B	B	--
DTC P0103 Mass Air Flow (MAF) Sensor Circuit High Frequency	B	B	--
DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage	B	B	--
DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage	B	B	--
DTC P0112 Intake Air Temperature (IAT) Sensor Circuit Low Voltage	B	B	--
DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage	B	B	--
DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage	B	B	--
DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage	B	B	--
DTC P0121 Throttle Position (TP) Sensor Performance	B	B	--
DTC P0122 Throttle Position (TP) Sensor Circuit Low Voltage	B	B	--
DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage	B	B	--
DTC P0125 Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control	B	B	--
DTC P0131 HO2S Circuit Low Voltage Sensor 1	B	B	--
DTC P0132 HO2S Circuit High Voltage Sensor 1	B	B	--
DTC P0133 HO2S Slow Response Sensor 1	B	C	--
DTC P0134 HO2S Circuit Insufficient Activity Sensor 1	B	B	--
DTC P0135 HO2S Heater Performance Sensor 1	B	B	--
DTC P0137 HO2S Circuit Low Voltage Sensor 2	B	B	--
DTC P0138 HO2S Circuit High Voltage Sensor 2	B	B	--
DTC P0140 HO2S Circuit Insufficient Activity Sensor 2	B	B	--
DTC P0141 HO2S Heater Performance Sensor 2	B	C	--
DTC P0171 Fuel Trim System Lean	B	C	--
DTC P0172 Fuel Trim System Rich	B	B	--
DTC P0201 Injector 1 Control Circuit	B	B	--
DTC P0202 Injector 2 Control Circuit	B	B	--
DTC P0203 Injector 3 Control Circuit	B	B	--
DTC P0205 Injector 5 Control Circuit	B	B	--
DTC P0206 Injector 6 Control Circuit	B	B	--
DTC P0218 Transmission Fluid Overtemperature	C	C	--
DTC P0230 Fuel Pump Relay Control Circuit	C	C	--
DTC P0300 Engine Misfire Detected	B	B	--
DTC P0325 Knock Sensor Module Performance	B	B	--
DTC P0327 Knock Sensor (KS) Circuit	B	B	--
DTC P0336 Crankshaft Position (CKP) Sensor Circuit	B	B	--
DTC P0341 Camshaft Position (CMP) Sensor Performance	B	B	--
DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient	A	A	--
DTC P0403 Exhaust Gas Recirculation (EGR) Solenoid Control Circuit	B	B	--
DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance	B	B	--
DTC P0405 Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage	B	B	--
DTC P0420 Catalyst System Low Efficiency	A	A	--
DTC P0440 Evaporative Emission (EVAP) System	A	A	--
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected	A	A	--
DTC P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit	B	B	--
DTC P0446 Evaporative Emission (EVAP) Vent System Performance	A	A	--
DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit	B	B	--
DTC P0452 Fuel Tank Pressure Sensor Circuit Low Voltage	B	B	--
DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage	B	B	--
DTC P0462 Fuel Level Sensor Circuit Low Voltage	C	C	--
DTC P0463 Fuel Level Sensor Circuit High Voltage	C	C	--
DTC P0480 Cooling Fan Relay 1 Control Circuit	B	B	--
DTC P0481Cooling Fan Relay 2 Control Circuit	B	B	--
DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input	A	A	--
DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent	A	A	--
DTC P0506 Idle Speed Low	B	B	--
DTC P0507 Idle Speed High	B	B	--
DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit	C	C	--
DTC P0560 System Voltage	C	C	--
DTC P0601 Control Module Read Only Memory (ROM)	A	A	--
DTC P0602 Control Module Not Programmed	A	A	--
DTC P0620 Generator Performance	C	C	--
DTC P0650 Malfunction Indicator Lamp (MIL) Control Circuit	A	A	--
DTC P0711 TFT Sensor Circuit Range/Performance	C	C	--
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input	C	C	--
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input	C	C	--
DTC P0719 Brake Switch Circuit Low Input	C	C	--
DTC P0724 Brake Switch Circuit High Input	C	C	--
DTC P0740 TCC Enable Solenoid Circuit Electrical	B	B	--
DTC P0742 TCC System Stuck On	B	B	--
DTC P0751 1-2 Shift Solenoid Valve Performance	A	A	--
DTC P0753 1-2 Shift Solenoid Circuit Electrical	B	B	--
DTC P0756 2-3 Shift Solenoid Valve Performance	A	A	--
DTC P0758 2-3 Shift Solenoid Circuit Electrical	A	A	--
DTC P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage	C	C	--
DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage	C	C	--
DTC P1111 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage	C	C	--
DTC P1112 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage	C	C	--
DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage	C	C	--
DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage	C	C	--
DTC P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage	C	C	--
DTC P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage	C	C	--
DTC P1133 HO2S Insufficient Switching Sensor 1	B	B	--
DTC P1134 HO2S Transition Time Ratio Sensor 1	B	B	--
DTC P1336 Crankshaft Position (CKP) System Variation Not Learned	A	A	--
DTC P1351 Ignition Coil Control Circuit High Voltage	B	B	--
DTC P1352 Ignition Bypass Circuit High Voltage	B	B	--
DTC P1361 Ignition Control (IC) Circuit Low Voltage	B	B	--
DTC P1362 Ignition Bypass Circuit Low Voltage	B	B	--
DTC P1374 Crankshaft Position (CKP) High to Low Resolution Frequency Correlation	B	B	--
DTC P1380 Misfire Detected - Rough Road Data Not Available	C	C	--
DTC P1381 Misfire Detected - No Communication with Brake Control Module	C	C	--
DTC P1404 Exhaust Gas Recirculation (EGR) Closed Position Performance	A	A	--
DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge	B	B	--
DTC P1483 Engine Cooling System Performance	C	C	--
DTC P1546 Air Conditioning (A/C) Clutch Relay Control Circuit	C	C	--
DTC P1554 Cruise Control Feedback Circuit	C	C	--
DTC P1585 Cruise Control Inhibit Output Circuit	C	C	--
DTC P1602 Lost Communications with Brake/Traction Control (EBTCM) System	C	C	--
DTC P1605 Lost Communications with HVAC Control System	C	C	--
DTC P1610 Lost Communications with Body Multiple Control (BCM) System	C	C	--
DTC P1626 Theft Deterrent Fuel Enable Signal Lost	C	C	--
DTC P1630 Theft Deterrent Learn Mode Active	C	C	--
DTC P1631 Theft Deterrent Start Enable Signal Not Correct	C	C	--
DTC P1635 5 Volt Reference Circuit	B	B	--
DTC P1639 5 Volt Reference 2 Circuit	B	B	--
DTC P1814 Torque Converter Overstressed	C	C	--
DTC P1860 TCC PWM Solenoid Circuit Electrical	B	B	--
DTC P1870 Transmission Component Slipping	B	B	--