Possible causes

– Faulty fuel injector 3
– Fuel Injector 3 harness is open or shorted
– Fuel injector 3 circuit poor electrical connection

When is the code detected?

The P0203 is set if the Engine Control Module (ECM) is detects a low or high voltage drop or resistance at the injector 3.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of Power
– The engine may be harder to start
– Engine hesitation

P0203 Description

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0203 code when the resistance or voltage drop at the injector 3 is out of specifications.

P0203 Information for specific makes

P0203 CADILLAC
P0203 CHEVROLET
P0203 GMC
P0203 PONTIAC
P0203 FORD
P0203 SATURN
P0203 BUICK
P0203 BMW
P0203 CHRYSLER
P0203 HYUNDAI
P0203 KIA
P0203 ISUZU
P0203 LEXUS
P0203 MAZDA
P0203 MITSUBISHI
P0203 NISSAN
P0203 VOLKSWAGEN
P0203 JAGUAR
P0203 DODGE
P0203 JEEP