P28F4 — Engine Disconnect Clutch Pressure Sensor Circuit High

What Does P28F4 Mean?

P28F4 is a diagnostic trouble code indicating: Engine Disconnect Clutch Pressure Sensor Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P28F4

⚠️ Check Engine Light (MIL) illuminated
⚠️ Engine Disconnect Clutch Pressure Sensor reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Engine Disconnect Clutch Pressure Sensor wiring harness
🔍 Corroded or water-damaged Engine Disconnect Clutch Pressure Sensor connector
🔍 Faulty Engine Disconnect Clutch Pressure Sensor outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P28F4 mean?

P28F4 indicates: Engine Disconnect Clutch Pressure Sensor Circuit High. The vehicle's computer has detected that the Engine Disconnect Clutch Pressure Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P28F4?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P28F4 for extended periods may cause additional problems.

How much does it cost to fix P28F4?

Repair costs for P28F4 typically range from $20 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 Engine Disconnect Clutch Pressure Sensor wiring for short to voltage
🔧 Clean or replace corroded Engine Disconnect Clutch Pressure Sensor connector
🔧 Replace faulty Engine Disconnect Clutch Pressure Sensor

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.

P28F4: Engine Disconnect Clutch Pressure Sensor Circuit High