Powertrain
Definition only
Lights the check engine lamp
P28B8: Cylinder 11 Ion Current Sense Circuit
Standardized SAE J2012 code · P28xx codes
What does P28B8 mean?
The ECM cannot read a valid ion current signal from cylinder 11. 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 P28B8 on the same make and model first.
P28B8 in the community
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Describe your P28B8 problemRelated codes
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- 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
- P28BC Cylinder 12 Ion Current Sense Circuit