Possible causes

– Faulty immobilizer key
– Poor electrical connection for immobilizer circuit components
– Faulty immobilizer control unit
– Faulty immobilizer key antenna

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– No or hard engine start situation

P0513 Information for specific makes

P0513 CADILLAC
P0513 DODGE
P0513 MITSUBISHI
P0513 SUBARU
P0513 VOLKSWAGEN
P0513 BUICK
P0513 CHEVROLET
P0513 GMC
P0513 PONTIAC
P0513 SATURN