Trouble codes Buick Century 2003

Car Forums Repairs & Maintenance Trouble codes Buick Century 2003

  • February 10, 2021 at 2:44 am

    My car is throwing code P0405. ( a circuit low) already took the EGR VALVE out and cleaned it. Still barely any acceleration still. What should I do next?

    February 10, 2021 at 2:48 am
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    P0405 means that there is a fault in the circuit and this is often caused by faulty wirings or a faulty EGR valve. Need to test the EGR valve with a diagnostic scanner from the engine control unit. Can probably measure it with a multimeter also but need the right values from the manufacturer