Category: Buick

P0502 Buick Vehicle Speed Sensor A Low Input Possible causes – Faulty Vehicle Speed Sensor– Vehicle speed sensor harness or connectors is open or shorted– Vehicle speed sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) What about the obd code? The signal sent by the vehicle speed sensor to ECM is too low….

P0503 Buick Vehicle Speed Sensor A Intermittent/Erratic/High Possible causes – Faulty Vehicle Speed Sensor– Vehicle speed sensor harness or connectors is open or shorted– Vehicle speed sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) What about the obd code? The signal sent by the vehicle speed sensor to ECM is too high or…

P0504 Buick Brake Switch Circuit A / B Correlation Possible causes – Faulty stop lamp switch– Blown stop lamp bulb– Brake switch harness open or shorted– Brake switch circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0504 Buick Description In addition to turning on the stop lamp, the…

P0505 Buick Idle Air Control System Possible causes – Electronic Throttle Control System (ETCS).– Air induction system– PCV hose connection What about the obd code? The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM concludes that the idle speed control ECM function is malfunctioning if: 1)…

P0498 Buick Evaporative Emission (EVAP) System Vent Valve Control Circuit Low OBD Code: System: Subsystem:  P0498 Buick – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Evaporative Emission (EVAP) System Vent Valve Control Circuit Low Location: Analysis: Possible Causes:    End of Range – Circuit Lower Than Expected   Tech description: Buick Vehicle:Buick Regal – ?Buick…

P0499 Buick Evaporative Emission (EVAP) System Vent Valve Control Circuit High OBD Code: System: Subsystem:  P0499 Buick – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Evaporative Emission (EVAP) System Vent Valve Control Circuit High Location: Analysis: Possible Causes:    End of Range – Circuit Higher Than Expected   Tech description: Buick Vehicle:Buick Regal – ?Buick…

P0500 Buick Vehicle Speed Sensor Possible causes – Faulty Vehicle Speed Sensor– Vehicle speed sensor harness or connectors is open or shorted– Vehicle speed sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) Tech description On most models the Vehicle Speed Sensor (VSS) is installed in the transaxle, on some models poor connection at…

P0501 Buick Vehicle Speed Sensor A Range/Performance Possible causes – Faulty Vehicle Speed Sensor– Vehicle speed sensor harness or connectors is open or shorted– Vehicle speed sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Speedometer may not work properly– Transmission shifting problem…

P0494 Buick Fan Speed Low Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue…

P0495 Buick Fan Speed High Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue…

P0496 Buick Evaporative Emission System Flow During Non-Purge Possible causes – Faulty EVAP canister vent valve– Faulty EVAP canister pruge valve– Plugged EVAP canister condition– Faulty EVAP pressure sensor What about the obd code? The ECM has detected pressure in the EVAP system during a non-purge condition. P0496 Buick Description The evaporative emission (EVAP) control…

P0497 Buick Evaporative Emission (EVAP) System Low Purge Flow OBD Code: System: Subsystem:  P0497 Buick – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Evaporative Emission (EVAP) System Low Purge Flow Location: Analysis: Possible Causes:       Tech description: Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century…

P0493 Buick Fan Overspeed Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue –…

P0488 Buick Exhaust Gas Recirculation Throttle Control Circuit A Range/Performance Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0488 Buick Description Exhaust Gas Recirculation (EGR) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick…

P0489 Buick Exhaust Gas Recirculation Throttle Control Circuit A Circuit Low Possible causes – Faulty Exhaust Gas Recirculation (EGR) Solenoid– Exhaust Gas Recirculation (EGR) Solenoid harness is open or shorted– Exhaust Gas Recirculation (EGR) Solenoid circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0489 Buick Description The Engine…

P0490 Buick Exhaust Gas Recirculation Throttle Control Circuit A Circuit High Possible causes – Faulty Exhaust Gas Recirculation (EGR) Solenoid– Exhaust Gas Recirculation (EGR) Solenoid harness is open or shorted– Exhaust Gas Recirculation (EGR) Solenoid circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0490 Buick Description The Engine…

P0491 Buick Secondary Air Injection System Insufficient Flow Bank 1 Possible causes – Secondary air pump with no or low air flow– Secondary air bypass solenoid leaking /blocked or stuck open /closed– Secondary AIR air hose restricted– Secondary air vacuum hoses restricted or leaking Symptoms – Engine Light ON (or Service Engine Soon Warning Light)…

P0492 Buick Secondary Air Injection System Insufficient Flow Bank 2 Possible causes – Intake leak– Damaged AIR system components– Faulty AIR Solenoid Valve– Faulty AIR system relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century –…

P0484 Buick Cooling Fan Circuit Over Current Possible causes – Faulty fan control relay– Faulty cooling fan– Fan control relay harness is open or shorted– Fan control relay circuit poor electrical connection– Fan cooling fan harness is open or shorted– Fan cooling fan circuit poor electrical connection What about the obd code? The P0484 Buick…

P0485 Buick Cooling Fan Power/Ground Circuit Malfunction Possible causes – Faulty fan control relay– Faulty cooling fan– Fan control relay harness is open or shorted– Fan control relay circuit poor electrical connection– Fan cooling fan harness is open or shorted– Fan cooling fan circuit poor electrical connection What about the obd code? The P0485 Buick…