Code result
P28F4
Engine Disconnect Clutch Pressure Sensor Circuit High
High severity
What it means
Voltage on the engine disconnect clutch pressure sensor signal line is above the expected window. Wire shorted to B+ or sensor open.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Signal wire shorted to B+
highOne of the most commonly reported causes for this code — check this first.
Open pressure sensor
mediumA plausible cause — test and verify before replacing parts.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P28F4 freeNo credit card required