- Fuel Injector 12 harness is open or shorted
- Fuel injector 12 circuit poor electrical connection

- Faulty fuel injector
- Faulty Engine Control Module (ECM)

The P0212 is set if the Engine Control Module (ECM) is detects a low or high voltage drop or resistance at the injector 12.

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

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0212 code when the resistance or voltage drop at the injector 12 is out of specifications.