Learn about DTC P20C3 severity, symptoms like reduced engine performance and black smoke, and common causes including faulty reductant heater circuit.
Read more....Day: October 19, 2025
P20C4 – High Reductant Heater Control Circuit C
P20C4 DTC indicates a serious high reductant heater circuit issue requiring immediate attention.
Read more....P20C5 – D Reductant Heater Control Circuit / Open
P20C5 DTC indicates a serious reductant heater control circuit issue requiring immediate attention.
Read more....P20C6 – D Reducer Heater Control Circuit Performance
Learn about DTC P20C6 severity, symptoms like reduced engine performance and black smoke, and common causes including faulty reductant heaters.
Read more....P20C7 – Reductant Heater D Control Circuit Low
Discover the seriousness of P20C7 DTC: reduced engine performance, excessive smoke, and potential SCR system damage.
Read more....P20C8 – High Reductant Heater D Control Circuit
Learn about DTC P20C8 severity, symptoms like reduced engine performance and black smoke, and common causes including faulty heater circuit.
Read more....P20C9 – MIL Illumination Required for Reducer Control Module
Learn about P20C9 code causes, symptoms, and fixes for your Reduction Gear Control Module.
Read more....P20CA – Reductant Injection Air Pressure Leak
Learn how to diagnose and fix the P20CA code for Reductant Injection Air Pressure Leak. Check wiring, connectors, and symptoms like engine light on.
Read more....P20CB – Exhaust Gas Aftertreatment Fuel Injector A Control Circuit / Open
Learn about DTC P20CB severity, symptoms like engine performance loss and black smoke, and common causes including faulty EAS fuel injector and circuit issues.
Read more....P20CC – Exhaust Gas Aftertreatment Fuel Injector A Circuit Performance Control
Learn about P20CC DTC severity, symptoms like engine performance loss and black smoke, and common causes including faulty EAS fuel injector and circuit issues.
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