Powertrain: engine, transmission and driveline systems.
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Generic SAE-standard code: same meaning on every make.
4D9
Specific fault index within the subsystem.
Frequently asked questions about P04D9
What does P04D9 mean?
Closed Loop EGR Control At Limit - Flow Too Low. The control module detected that the Closed Loop EGR Control At Limit - Flow value was below the expected limit.
Is P04D9 generic or manufacturer-specific?
P04D9 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P04D9 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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