P28AA
Cylinder 7 Ion Current Sense Circuit Low
P28AA is an OBD-II diagnostic trouble code meaning: Cylinder 7 Ion Current Sense Circuit Low. Common causes: open or short circuit in the ion current circuit of the 7th cylinder, malfunction of the spark plug of the 7th cylinder. Estimated repair cost: $17–89.
Symptoms
- Unstable engine idling
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Illuminates
- Possible misfire
Causes
- Open or short circuit in the ion current circuit of the 7th cylinder
- Malfunction of the spark plug of the 7th cylinder
- Problems with the ignition coil
- Engine control unit malfunction
- Poor contact in sensor circuit connector
How to Fix
- Check the integrity of wires and connections in the circuit of the 7th cylinder
- Replace the spark plug in cylinder 7
- Check and, if necessary, replace the ignition coil
- Test sensor circuit resistance
- Check ECU software for updates
Related codes
Error P28AA by Vehicle Brand
FAQ
What does the P28AA code mean?
P28AA is an OBD-II diagnostic trouble code that indicates: Cylinder 7 Ion Current Sense Circuit Low
What causes a P28AA error code?
The most common causes of P28AA include: Open or short circuit in the ion current circuit of the 7th cylinder; Malfunction of the spark plug of the 7th cylinder; Problems with the ignition coil; Engine control unit malfunction.
How do I fix a P28AA diagnostic trouble code?
To fix P28AA: Check the integrity of wires and connections in the circuit of the 7th cylinder. Replace the spark plug in cylinder 7. Check and, if necessary, replace the ignition coil. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P28AA?
Do not drive — repair immediately
How much does it cost to fix P28AA?
The estimated repair cost for P28AA is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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