Exhaust Aftertreatment Fuel Injector B Control Circuit Low

Where it lives

For P20D3, the injector sits on the circuit this code reports. The description of P20D3 reports a fault at the injector.

Check these first

• Low fuel pressure feeding exhaust aftertreatment fuel injector B
• Corrosion or damage in the injector B control wiring
• A short to ground on the injector B control circuit
• A failing injector B control module
• A clogged injector B or restricted supply line

What to do next

1. Check fuel pressure feeding injector B
2. Inspect the injector B wiring and connector for corrosion
3. Test the injector B control circuit for a short to ground
4. Command injector B with a scan tool and watch exhaust temperature
5. Replace injector B or its control module if the circuit stays low
6. Clear the code and retest

Look up another code