P28B1
Cylinder 9 Ion Current Sense Circuit Range/Performance
P28B1 is an OBD-II diagnostic trouble code meaning: Cylinder 9 Ion Current Sense Circuit Range/Performance. Common causes: open or short circuit in the ion current circuit, malfunction of the spark plug of the 9th cylinder. Estimated repair cost: $17–67.
Symptoms
- Unstable engine operation
- Power Loss
- Increased fuel consumption
- Check Engine Light Illuminates
- Possible misfire in cylinder 9
Causes
- Open or short circuit in the ion current circuit
- Malfunction of the spark plug of the 9th cylinder
- Problems with the ignition coil
- Low cylinder compression
- Engine control unit malfunction
How to Fix
- Check the integrity of the ion current circuit of the 9th cylinder
- Replace the spark plug in cylinder 9
- Check and, if necessary, replace the ignition coil
- Measure compression in cylinder 9
- Diagnose the engine control unit
Related codes
Error P28B1 by Vehicle Brand
FAQ
What does the P28B1 code mean?
P28B1 is an OBD-II diagnostic trouble code that indicates: Cylinder 9 Ion Current Sense Circuit Range/Performance
What causes a P28B1 error code?
The most common causes of P28B1 include: Open or short circuit in the ion current circuit; Malfunction of the spark plug of the 9th cylinder; Problems with the ignition coil; Low cylinder compression.
How do I fix a P28B1 diagnostic trouble code?
To fix P28B1: Check the integrity of the ion current circuit of the 9th cylinder. Replace the spark plug in cylinder 9. Check and, if necessary, replace the ignition coil. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P28B1?
Limited driving only, diagnose soon
How much does it cost to fix P28B1?
The estimated repair cost for P28B1 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
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