The control module detected that the signal in the Cylinder 5 Ion Current Sense circuit stayed above the expected operating range.
TuningBot DTC Database · v4.37.15
P28A3 Cylinder 5 Ion Current Sense Circuit High
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P28A3 means
Related and nearby codes
How to read P28A3
Powertrain: engine, transmission and driveline systems.
Generic SAE-standard code: same meaning on every make.
Specific fault index within the subsystem.
Frequently asked questions about P28A3
What does P28A3 mean?
Cylinder 5 Ion Current Sense Circuit High. The control module detected that the signal in the Cylinder 5 Ion Current Sense circuit stayed above the expected operating range.
Is P28A3 generic or manufacturer-specific?
P28A3 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P28A3 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic
