ZF 6009.055.027 CONTROL UNIT for WG150 | OEM Genuine Part

Overview

The ZF 6009.055.027 CONTROL UNIT is a critical electronic module within the WG150 transmission series, responsible for managing hydraulic pressure modulation and shift timing. Positioned on the valve body assembly, this OEM genuine part interprets input signals to regulate clutch engagement and gear selection. The SKU 6009.055.027 ensures precise communication between the transmission control system and the mechanical components, directly influencing drivability and fuel efficiency. When integrated with a robust TRANSMISSION HOUSING or a TRANSMISSION HOUSING, this control unit maintains consistent oil flow and pressure stability across the entire operating range.

Symptoms of Failure

• Erratic shifting or gear hunting: A failing 6009.055.027 often causes the transmission to slip between gears or delay engagement, especially under load. This symptom is frequently searched as “ZF WG150 shift hesitation” or “control unit causing gear slip.”
• Intermittent loss of drive: When the control unit degrades, the transmission may suddenly drop into neutral without warning. Technicians searching for “transmission control unit failure symptoms” or “WG150 no forward gear” will find this issue common.
• Check engine light with transmission codes: Internal electrical faults in the 6009.055.027 trigger diagnostic trouble codes (DTCs) like P0700 or P0740. Users often query “ZF transmission control module error codes” or “6009.055.027 electrical failure.”
• Harsh or flared shifts: Worn solenoids or circuit board damage within the control unit produce abrupt gear changes or prolonged slipping between ratios, a condition frequently reported as “ZF WG150 hard shift” or “transmission flare on upshift.”

Technical Specifications

Compatibility

This control unit is engineered for the ZF WG150 series, but its design shares hydraulic architecture with the WG180 and WG200 models. The 6009.055.027 is directly compatible with WG150 variants produced after 2008, including those used in municipal trucks, buses, and off-highway equipment. It also fits select WG160 applications where the valve body configuration matches. For proper installation, verify the TYPE PLATE on your transmission to confirm model year and revision level. The unit mounts using GROOVED STUD fasteners, which must be torqued to specification to prevent fluid bypass.

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