Category: Buick

P0446 Buick Evaporative Emission Vent System Performance Possible causes – Plugged vapor canister– Faulty vent solenoid– Pinched or blocked EVAP hose– Faulty FTP sensor Tech description Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition. What about the obd code? The Powertrain Control Module…

P0447 Buick EVAP System Vent Control Circuit Open Possible causes – Faulty canister vent control valve– Purge Control Valve harness is open or shorted– Purge Control Valve electrical circuit poor connection What about the obd code? An improper voltage signal is sent to Engine Control Module (ECM) through Evaporative Emission System (EVAP) canister vent control…

P0448 Buick EVAP System Vent Control Circuit Shorted Possible causes – Faulty canister vent control valve– Purge Control Valve harness is open or shorted– Purge Control Valve electrical circuit poor connection What about the obd code? EVAP canister vent control valve remains closed under specified driving conditions. Symptoms – Engine Light ON (or Service Engine…

P0449 Buick EVAP System Vent Valve/Solenoid Circuit Possible causes – Purge Control Valve harness is open or shorted– Purge Control Valve electrical circuit poor connection– Faulty canister vent control valve What about the obd code? The Engine Control Module (ECM) has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in…

P0441 Buick EVAP System Incorrect Purge Flow Possible causes – Missing Fuel cap– Incorrect fuel filler cap used– Fuel filler cap remains open or fails to close– Foreign matter caught in fuel filler cap– Incorrect fuel tank vacuum relief valve Tech description The P0441 Buick code means that the control module has detected a leak…

P0442 Buick EVAP Control System Leak Detected Small Leak Possible causes – Missing or loose fuel cap– Incorrect fuel filler cap used– Fuel filler cap remains open or fails to close– Foreign matter caught in fuel filler cap – EVAP canister or fuel tank leaks– EVAP system hose leaking– Fuel tank leaking Tech description What…

P0443 Buick EVAP Canister Purge Valve Circuit Malfunction Possible causes – Faulty Evaporative Emission (EVAP) Purge Solenoid Control– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection What about the obd code? An improper voltage signal is sent to Engine Control Module (ECM)…

P0444 Buick Evaporative Emission Control System Purge Control Valve Circuit Open Possible causes – Faulty Evaporative Emission (EVAP) Purge Solenoid Control– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection What about the obd code? – An excessively low voltage signal is sent…

P0445 Buick EVAP Purge Solenoid Circuit Possible causes – Faulty Evaporative Emission (EVAP) Purge Solenoid Control– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection What about the obd code? – An excessively high voltage signal is sent to Engine Control Module (ECM)…

P0438 Buick Catalyst Temperature Sensor High Input Bank 2 Sensor 1 Possible causes – Catalyst Temperature Sensor harness is open or shorted– Catalyst Temperature Sensor circuit poor electrical connection– Faulty Catalyst Temperature Sensor Tech description As the code description implies the P0438 Buick code means that the vehicle’s control module has detected that the three-way…

P0439 Buick Catalyst Heater Control Circuit Bank 2 Possible causes – Catalyst Temperature Sensor harness is open or shorted– Catalyst Temperature Sensor circuit poor electrical connection– Faulty Catalyst Temperature Sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0439 Buick Description The Engine Control Module (ECM) monitors the switching frequency ratio of…

P043A Buick Catalyst Temperature Sensor Circuit (Bank 2 – Sensor 2) OBD Code: System: Subsystem:  P043A Buick – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Catalyst Temperature Sensor Circuit (Bank 2 – Sensor 2) Location: Analysis: Possible Causes:  Bank 2 – Sensor 2  Circuit Issue   Tech description: Buick Vehicle:Buick Regal – ?Buick Riviera –…

P0433 Buick Heated Catalyst Efficiency Below Threshold Bank 2 Possible causes – Air leak before catalytic converter– Faulty oxygen sensor– Faulty Catalytic Converter Tech description As the code description implies the P0433 Buick code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient…

P0434 Buick Heated Catalyst Temperature Below Threshold Bank 2 Possible causes – Air leak before catalytic converter– Faulty oxygen sensor– Faulty Catalytic Converter Tech description As the code description implies the P0434 Buick code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient…

P0435 Buick Catalyst Temperature Sensor Circuit Bank 2 Sensor 1 Possible causes – Catalyst Temperature Sensor harness is open or shorted– Catalyst Temperature Sensor circuit poor electrical connection– Faulty Catalyst Temperature Sensor Tech description As the code description implies the P0435 Buick code means that the vehicle’s control module has detected that the three-way catalytic…

P0436 Buick Catalyst Temperature Sensor Range/Performance Bank 2 Sensor 1 Possible causes – Catalyst Temperature Sensor harness is open or shorted– Catalyst Temperature Sensor circuit poor electrical connection– Faulty Catalyst Temperature Sensor Tech description As the code description implies the P0436 Buick code means that the vehicle’s control module has detected that the three-way catalytic…