Overview
The ZF 6073.015.257 EST 37 A for WG211 is a critical electronic control unit (ECU) that governs shift timing, pressure modulation, and diagnostic communication within the WG 211 series transmission. This OEM genuine part, identified by SKU 6073.015.257, interfaces directly with the valve body to ensure precise gear engagement and torque converter lockup. It sits in the upper valve body area, acting as the brain of the hydraulic system. When paired with a robust TRANSMISSION HOUSING, this unit maintains consistent oil flow and thermal stability, preventing erratic shifting under heavy loads.
Symptoms of Failure
- Erratic or delayed gear engagement: When the EST 37 A fails, you may experience a noticeable lag between selecting a gear and actual engagement, especially during cold starts.
- Intermittent loss of communication: The transmission control module may log fault codes for “solenoid circuit open” or “pressure control malfunction,” leading to a default limp-home mode.
- Harsh upshifts or downshifts: Worn internal electronics cause inconsistent hydraulic pressure, resulting in jarring shifts that can damage the HOUS.FRONT SECT and surrounding components.
- Oil contamination from internal short circuits: A failing unit can leak electrical current into the transmission fluid, accelerating wear on seals and the HOUSING REAR PART.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.257 |
| OEM Reference | EST 37 A |
| Material | High-temp polymer with aluminum heat sink |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 40 mm |
| Operating Voltage | 12V / 24V DC |
| Connector Type | 40-pin AMP |
| Torque Spec (mounting bolts) | 8 Nm |
Compatibility
This EST 37 A unit is engineered for the ZF WG 211 series, but it also fits select models in the WG180, WG200, and WG250 families when the valve body configuration matches. It is a direct replacement for earlier EST 35 variants. For proper installation, ensure the CYLINDRICAL PIN is correctly aligned to prevent mis-seating. Always verify your transmission serial number against ZF service bulletin TB-2021-04 for cross-reference.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses gear train and supports valve body |
| 4657301130 | HOUS.FRONT SECT | Front section housing for pump and torque converter |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636102489 | CAP SCREW | M10 bolt for securing valve body to housing |
| 4656301148 | FIXING PLATE | Retainer plate for solenoid harness |
| 0636102463 | CAP SCREW | M8 bolt for front section attachment |
| 4657201133 | SCREEN SHEET | Fine mesh filter protecting valve body from debris |
| 0636115287 | CAP SCREW | M12 bolt for rear housing flange |
| 4657301065 | PLATE | Spacer plate between valve body and housing |
Frequently Asked Questions
Q: Can I use this EST 37 A unit on a WG180 transmission?
A: Yes, it is compatible with WG180 models that use the same 40-pin connector and software revision. However, you must also replace the FIXING PLATE if the original is corroded.
Q: What causes the “solenoid circuit low” error after replacing this part?
A: This often indicates a poor ground connection. Verify that the CYLINDRICAL PIN is fully seated and the harness is not pinched against the HOUSING REAR PART.
Q: Is programming required after installation?
A: No, this is a plug-and-play replacement. However, you should perform a transmission adaptation reset using a diagnostic tool to clear learned shift patterns.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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