Category: Chevrolet

P0506 Chevrolet Idle Air Control System RPM Lower Than Expected Large vacuum leak on engine Possible causes – Dirty throttle body– Electric throttle control actuator misadjusted or damaged– Faulty Electric throttle control actuator– Intake air leak– Poor electrical connection to the Intake Air Control (IAC) valve Tech description If there are no intake leaks, clean…

P0507 Chevrolet Idle Air Control System RPM Higher Than Expected Possible causes – Dirty throttle body– Electric throttle control actuator misadjusted or damaged– Faulty Electric throttle control actuator– Intake air leak– Poor electrical connection to the Intake Air Control (IAC) valve Tech description If there are no intake leaks, clean throttle body, adjust engine idle…

P0508 Chevrolet Idle Air Control Valve Sense Circuit Low Possible causes – Dirty throttle body– Electric throttle control actuator misadjusted or damaged– Faulty Electric throttle control actuator– Intake air leak– Poor electrical connection to the Intake Air Control (IAC) valve Tech description If there are no intake leaks, clean throttle body, adjust engine idle and…

P0499 Chevrolet Evaporative Emission (EVAP) System Vent Valve Control Circuit High OBD Code: System: Subsystem:  P0499 Chevrolet – (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:

P0500 Chevrolet 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 Chevrolet 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…

P0502 Chevrolet 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 Chevrolet 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…

P0498 Chevrolet Evaporative Emission (EVAP) System Vent Valve Control Circuit Low OBD Code: System: Subsystem:  P0498 Chevrolet – (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:

P0494 Chevrolet Fan Speed Low Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P0495 Chevrolet Fan Speed High Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P0496 Chevrolet 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 Chevrolet Description The evaporative emission (EVAP) control…

P0497 Chevrolet Evaporative Emission (EVAP) System Low Purge Flow OBD Code: System: Subsystem:  P0497 Chevrolet – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Evaporative Emission (EVAP) System Low Purge Flow Location: Analysis: Possible Causes:       Tech description:

P0489 Chevrolet 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 Chevrolet Description The Engine…

P0490 Chevrolet 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 Chevrolet Description The Engine…

P0491 Chevrolet 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 Chevrolet 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)

P0493 Chevrolet Fan Overspeed Possible causes – Faulty cooling fan clutch– Faulty control unit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P0484 Chevrolet 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 Chevrolet…

P0485 Chevrolet 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 Chevrolet…