Fault Family System: Powertrain (P-Codes) 5 SAE Codes

Engine Disconnect Clutch Pressure Sensor

Diagnostic & Technical Explanation

Code P28F1 (Engine Disconnect Clutch Pressure Sensor Circuit) sets when the hybrid control module sees an open, shorted, implausible, or intermittent signal from the pressure sensor that confirms hydraulic apply pressure at the engine disconnect clutch. Because this sensor gates every transition between electric and hybrid driving, causes to check are a corroded connector at the transmission case, fluid contamination fouling the sensor port, and a failed sensor element.

These 5 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P28F1	Engine Disconnect Clutch Pressure Sensor Circuit	3 ranked fixes
P28F2	Engine Disconnect Clutch Pressure Sensor Circuit Range/Performance	3 ranked fixes
P28F3	Engine Disconnect Clutch Pressure Sensor Circuit Low	3 ranked fixes
P28F4	Engine Disconnect Clutch Pressure Sensor Circuit High	3 ranked fixes
P28F5	Engine Disconnect Clutch Pressure Sensor Circuit Intermittent/Erratic	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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