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Brand: C.OEFT
OE numbers: 6T45E
Product Name:Transmission Control Unit (TCU TCM)
Compatible model:
Product status: Remanufactured
Product weight: 3.087KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: for Buick
Car Type: American
6AT-Specific Hydraulic Control System
As the core of 6T45E transmission control, the TCM adopts a semi-closed-loop hydraulic adjustment algorithm tailored for transverse 6-speed AT’s compact structure, achieving millisecond-level control of the transmission’s torque converter and 6 gear sets. It collects real-time signals from 12 key sensors (including torque converter lock-up status, 6 gear position sensors, hydraulic oil temperature, and input/output shaft speed sensors) and processes data through a 32-bit single-core MCU (Delphi MT20U2, operating frequency up to 160 MHz)—focused on stability rather than high performance, matching the needs of non-luxury models.
Daily Driving Smoothness: In urban commuting (throttle opening < 35%), the TCM controls the hydraulic pressure gradient to 0.08 MPa/10 ms. For example, when shifting from 2nd to 3rd gear at 40 km/h, the torque converter lock-up clutch engages with a pressure buffer of 0.15 MPa, reducing the jerk amplitude to less than 2.5 m/s²—meeting the comfort requirements of family vehicles like the Buick GL8;
Fuel-Efficient Gear Management: For high-speed cruising (120 km/h), the TCM activates the "6th gear early engagement" strategy. It shifts into 6th gear at 95 km/h, keeping the engine speed below 2,100 rpm (vs. 2,500 rpm for 4AT), reducing fuel consumption by 10%-12% compared to traditional 4AT models. Taking the Chevrolet Malibu 2.4L as an example, its comprehensive fuel consumption is as low as 9.0-9.8 L/100 km;
Torque Converter Lock-Up Optimization: The TCM optimizes the lock-up logic in 5 gears (excluding 1st and reverse gears). At medium speeds (50 km/h in 3rd gear), it activates the "slip lock-up" mode (slip rate < 3%), balancing comfort and efficiency; at high speeds (80 km/h in 5th gear), it switches to full lock-up, reducing torque converter power loss by 20%
1. Durable Design for Daily Use
Reliable Hardware: The TCM housing is made of die-cast aluminum alloy (ADC10) with IP67 protection level, resisting high temperatures (-40℃ to 130℃), corrosion (1,000-hour salt spray test), and vibration (10-1500 Hz, 25 G acceleration)—adapting to urban and suburban driving environments ;
Oil Degradation Resistance: Equipped with a basic oil quality sensor that monitors viscosity changes. When the oil viscosity deviates by 30% from the standard value, it sends a reminder, extending the transmission’s service life by 25%;
Strict Reliability Testing: Undergoes 8,000-hour high-temperature durability testing (130℃), 5,000-hour low-temperature cold start testing (-40℃), and 15,000-cycle gear engagement testing. Its mean time between failures (MTBF) exceeds 1.8 million hours—meeting the 10-year/200,000 km service life requirement of family vehicles.
2. Easy Maintenance and After-Sales Accessibility
Universal Diagnosis Support: Compatible with 90% of mainstream OBD-II diagnostic tools (e.g., Autel, XTOOL), which can read 180+ fault types and perform "basic adaptation" after TCM replacement—taking only 15 minutes to restore normal shifting;
Localized Spare Parts: Supplied through GM’s global after-sales network (including 1,200+ joint venture service centers in China) and third-party auto parts markets. Spare parts are delivered within 48 hours in first-tier cities, with a replacement labor cost of 200-500 yuan;
Extended Warranty Options: Backed by GM’s 24-month/60,000-kilometer basic warranty, and optional 3-year/100,000-kilometer extended warranty—reducing repair risks for vehicle owners.
3. Practical Adaptation to Family Vehicle Scenarios
Multi-Passenger Optimization: For MPVs like the Buick GL8, the TCM increases the hydraulic pressure holding time by 0.2 seconds during gear shifts, reducing jerk when the vehicle is fully loaded;
Urban Stop-and-Go Adaptation: Optimizes the 1st-2nd gear shift logic, reducing clutch engagement frequency by 15% in traffic jams—lowering wear on internal components;
Low-Speed Torque Protection: At speeds < 20 km/h, the TCM reduces the hydraulic pressure change rate by 20%, preventing sudden shocks when starting or stopping, which is friendly to elderly and child passengers.
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