P28BC — Cylinder 12 Ion Current Sense Circuit

What Does P28BC Mean?

P28BC is a diagnostic trouble code indicating: Cylinder 12 Ion Current Sense Circuit. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P28BC

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Cylinder 12 Ion Current Sense readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Cylinder 12 Ion Current Sense circuit (damaged, chafed, or corroded)
🔍 Faulty Cylinder 12 Ion Current Sense connector or terminal
🔍 Failed Cylinder 12 Ion Current Sense
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P28BC mean?

P28BC indicates: Cylinder 12 Ion Current Sense Circuit. The vehicle's computer has detected that the Cylinder 12 Ion Current Sense is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P28BC?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P28BC for extended periods may cause additional problems.

How much does it cost to fix P28BC?

Repair costs for P28BC typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Cylinder 12 Ion Current Sense wiring and connectors
🔧 Replace faulty Cylinder 12 Ion Current Sense

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P28BC: Cylinder 12 Ion Current Sense Circuit