Powertrain
Definition only
Lights the check engine lamp
P28A0: Cylinder 5 Ion Current Sense Circuit
Standardized SAE J2012 code · P28xx codes
What does P28A0 mean?
The ECM cannot read a valid ion current signal from cylinder 5. Ion current sensing relies on the spark plug acting as an electrode after combustion.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Ion sense module failed
- Medium Wiring or connector fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P28A0 on the same make and model first.
P28A0 in the community
Ask about P28A0No one has posted about P28A0 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P28A0 problemRelated codes
- P2890 Cylinder 1 Ion Current Sense Circuit
- P2894 Cylinder 2 Ion Current Sense Circuit
- P2898 Cylinder 3 Ion Current Sense Circuit
- P289C Cylinder 4 Ion Current Sense Circuit
- P28A4 Cylinder 6 Ion Current Sense Circuit
- P28A8 Cylinder 7 Ion Current Sense Circuit
- P28AC Cylinder 8 Ion Current Sense Circuit
- P28B0 Cylinder 9 Ion Current Sense Circuit
- P28B4 Cylinder 10 Ion Current Sense Circuit
- P28B8 Cylinder 11 Ion Current Sense Circuit
- P28BC Cylinder 12 Ion Current Sense Circuit