P20D3
PPowertrainAftertreatment Fuel Injector B Control Circuit Low
What does this code mean?
Severity : MediumP20D3 means the voltage is too low on the control circuit of exhaust aftertreatment fuel injector "B". On some diesels this injector sprays fuel into the exhaust to raise temperature and regenerate the DPF. A faulty circuit prevents proper regenerations.
Symptoms
- Check engine or DPF warning light on.
- DPF regenerations failing or incomplete.
- DPF gradually clogging.
- Limp mode if the DPF becomes too loaded.
Possible causes
- Injector wiring shorted to ground.
- Connector corroded by heat or moisture.
- Faulty aftertreatment fuel injector.
- Faulty control module, less commonly.
Diagnosis and repair
- Inspect the injector connector and wiring, which are often exposed to heat.
- Measure injector resistance and check the wiring for shorts to ground.
- Run an injector actuation test with the scan tool.
- Replace the injector or repair the wiring.
- Clear the code, then run a service regeneration if required.
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Code
P20D3
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012