P28B9
Cylinder 11 Ion Current Sense Circuit Range/Performance
P28B9 is an OBD-II diagnostic trouble code meaning: Cylinder 11 Ion Current Sense Circuit Range/Performance. Common causes: open or short circuit in the ion current circuit, faulty spark plug. Estimated repair cost: $6–56.
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Power Loss
- Check Engine Light Illuminates
- Possible misfires
Causes
- Open or short circuit in the ion current circuit
- Faulty spark plug
- Problems with the ignition coil
- Engine control unit malfunction
- Poor contact in connectors
How to Fix
- Check the integrity of the ion current circuit wiring
- Inspect and, if necessary, replace the spark plug
- Check the condition of the ignition coil
- Scan the control unit for errors
- Check contacts in connectors
Related codes
Error P28B9 by Vehicle Brand
FAQ
What does the P28B9 code mean?
P28B9 is an OBD-II diagnostic trouble code that indicates: Cylinder 11 Ion Current Sense Circuit Range/Performance
What causes a P28B9 error code?
The most common causes of P28B9 include: Open or short circuit in the ion current circuit; Faulty spark plug; Problems with the ignition coil; Engine control unit malfunction.
How do I fix a P28B9 diagnostic trouble code?
To fix P28B9: Check the integrity of the ion current circuit wiring. Inspect and, if necessary, replace the spark plug. Check the condition of the ignition coil. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P28B9?
Yes, but get it checked soon
How much does it cost to fix P28B9?
The estimated repair cost for P28B9 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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