Exhaust Aftertreatment Fuel Injector B Control Circuit High

Where it lives

For P20D4, the circuit described runs through the injector. The description of P20D4 reports a fault at the injector.

Check these first

• A short to voltage on the exhaust aftertreatment fuel injector B control wire
• High resistance at the injector B connector
• A failed injector B control relay
• A failed exhaust aftertreatment fuel injector B

What to do next

1. Read exhaust aftertreatment fuel injector B on a scan tool
2. Test the injector B control wire for a short to voltage
3. Check the injector B connector for high resistance
4. Test the injector B control relay
5. Replace exhaust aftertreatment fuel injector B if the circuit tests good
6. Clear the code and retest

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