Exhaust Aftertreatment Fuel Injector A Control Circuit/Open

Where it lives

For P20CB, the injector sits on the circuit this code reports. The description of P20CB reports the injector as open.

Check these first

• A faulty exhaust aftertreatment fuel injector A
• An open in the injector A control circuit
• A short in the injector A harness
• A poor electrical connection at the injector A connector

What to do next

1. Command the exhaust aftertreatment fuel injector A with a scan tool
2. Check the injector A control circuit for an open
3. Inspect the injector A connector and wiring
4. Test the injector A circuit for open and short faults
5. Replace the exhaust aftertreatment fuel injector A if it does not fire
6. Clear the code and retest

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