The control module judged the Cylinder 5 Ion Current Sense signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.
TuningBot DTC Database · v4.37.15
P28A1 Cylinder 5 Ion Current Sense Circuit Range/Performance
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P28A1 means
Related and nearby codes
How to read P28A1
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 P28A1
What does P28A1 mean?
Cylinder 5 Ion Current Sense Circuit Range/Performance. The control module judged the Cylinder 5 Ion Current Sense signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.
Is P28A1 generic or manufacturer-specific?
P28A1 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P28A1 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
