Buick Century Fault Codes
You can find common Buick Century fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
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Buick Century Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Buick Century has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Buick Century Recalls »
Common Century Fault Codes
These are the most common Century fault codes that people are searching for.
Engine Position System Performance - Bank 1Learn More
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Evaporative Emission Control System Vent Control Circuit MalfunctionLearn More Fixes
Evaporative Emission Control System MalfunctionLearn More Fixes
Evaporative Emission Control System Leak DetectedLearn More Fixes
Cylinder 2 Misfire DetectedLearn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)Learn More Fixes
Insufficient Coolant Temperature for Closed Loop Fuel ControlLearn More
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)Learn More Fixes
Exhaust Gas Recirculation Circuit Range/PerformanceLearn More
Exhaust Gas Recirculation Flow Insufficient DetectedLearn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
Exhaust Gas Recirculation Sensor A Circuit LowLearn More
IAT - B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position PerformanceLearn More
Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Crankshaft Position Sensor A Circuit Range/PerformanceLearn More
HO2S Insufficient Switching Sensor 1Learn More
Maximum Adaptive & Long Term ShiftLearn More
Theft Deterrent Fuel Enable Signal Not Received/ B+ Supply To VCRM A/C Circuit MalfunctionLearn More
Evaporative Emission Control (EVAP) System LeakLearn More
Vehicle ID Block Corrupted or Not ProgrammedLearn More
Ignition power stage A – circuit malfunctionLearn More
DPFE Sensor Circuit Downstream HoseLearn More
Pump Speed Signal FaultLearn More
Lamp ABS Warning Output Circuit FailureLearn More
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Intake Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Post Catalyst Fuel Trim System Too Rich Bank 2Learn More Fixes
Lost Communication With Body Control ModuleLearn More
Manifold Absolute Pressure/Barometric Pressure Circuit High InputLearn More
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
System Too Rich (Bank 1)Learn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance ProblemLearn More Fixes
Evaporative Emission System High Purge FlowLearn More Fixes
Camshaft Position B - Timing Over-Advanced or System Performance (Bank 2)Learn More
MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER AbortedLearn More
A/C Compressor Temperature Sensor MalfunctionLearn More
Accelerator/Throttle Pedal Position Sensor FaultLearn More
Intake Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Intake Camshaft Position Timing - Over-Retarded (Bank 1)Learn More Fixes
Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2Learn More Fixes
Mass or Volume Air Flow Circuit Low Voltage InputLearn More Fixes
Intake Air Temperature Circuit High InputLearn More Fixes
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)Learn More Fixes
System Too Rich (Bank 2)Learn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
Cylinder 4 Misfire DetectedLearn More Fixes
Cylinder 5 Misfire DetectedLearn More Fixes
Cylinder 6 Misfire DetectedLearn More Fixes
Knock Sensor 1 Circuit (Bank 2 or Single Sensor)Learn More Fixes
Knock Sensor 2 Circuit Low Input (Bank 2)Learn More Fixes
Crankshaft Position Sensor A Circuit MalfunctionLearn More Fixes
Camshaft Position Sensor Circuit Range/PerformanceLearn More Fixes
Evaporative Emission Control System Incorrect Purge flowLearn More Fixes
Evaporative Emission Control System Vent Valve/Solenoid Circuit MalfunctionLearn More Fixes
System Gross Leak Evaporative EmissionLearn More Fixes
Evaporative Emissions System Small Leak DetectedLearn More Fixes
Fuel Level Sensor Circuit High InputLearn More Fixes
Idle Control System RPM higher Than ExpectedLearn More Fixes
Transmission Control System MalfunctionLearn More Fixes
Post Catalyst Fuel Trim System Too Lean Bank 1Learn More Fixes
Post Catalyst Fuel Trim System Too Rich Bank 1Learn More Fixes
Throttle/Pedal Position Sensor/Switch A / B Voltage CorrelationLearn More Fixes
Throttle/Pedal Position Sensor/Switch D/E Voltage CorrelationLearn More Fixes
Bank 1 Air/Fuel Ratio ImbalanceLearn More Fixes
- Manufacturer: Buick
About the Century
The Century name first emerged all the way back in 1936, making it one of the oldest in Buick’s lineup. Since then, it has been manufactured intermittently. The modern version was unveiled in 1973 and remained on the market until its discontinuation in 2005.
While on the market, the model saw a total of six generations. Interestingly, the name has been used in China for the Buick GL8 minivan as of 2023.
Upon its discontinuation, Buick announced that the LaCrosse would take over as the flagship model and the successor of the Century.
Competition has included the Toyota Camry and Hyundai Sonata.
One of the most common issues that the model has faced is P0008. This code indicates that there is a misalignment of the first bank of the engine.
There can be a wide number of causes for this issue, but a faulty variable valve timing control solenoid is one of the more common. Replacing this component can result in the code being resolved.
Fault code P0430 is another common issue that some models faced. This code indicates that the catalytic converter in the second bank of the engine is not performing properly. Of course, only Century models fitted with a V-shaped engine can suffer this code as it affects the second catalytic converter.
Similarly, fault code P0420 is also common. This is the same code but for the first catalytic converter, meaning it can affect all models.
In most cases, these codes are the result of wear over time. Catalytic converters need to be replaced at set intervals and neglecting to do so can result in the code being logged. In addition to this, exhaust leaks upstream of the converter can cause these issues.