ZF 4BP230 Fault Code Diagnosis: Understanding “BA” (Filter Clogged) and “B1-B6” (Clutch Slippage) Errors

Introduction: What Your Transmission is Telling You

The ZF 4BP230 transmission’s electronic control unit (TCU) monitors for faults and reports them via codes on the display. Understanding these codes is the first step to fast, accurate repair. As a 20-year technical expert, Tianjin XiaoHang Construction Machinery Co., Ltd. explains the most common fault codes.

Section 1: The Most Common Fault Codes

A Guide for Technicians

If your machine shows a fault, check this list:

Code “BA” (Filter Clogged): This code indicates that the transmission fine filter is clogged or the sensor circuit has failed. This is a critical warning; you must replace the filter immediately (e.g., Part No. [0501.298.690]) to prevent oil starvation and pump damage.

Codes “B1” through “B6” (Clutch Slippage): These codes indicate that a specific clutch pack is slipping. For example:

B1: Clutch K1 slippage

B2: Clutch K2 slippage

B3: Clutch K3 slippage

B4: Clutch K4 slippage

B5: Clutch KV (Forward) slippage

B6: Clutch KR (Reverse) slippage

Code “3E” (Speed Sensor Failure): This indicates the output speed sensor signal has failed. This requires checking the sensor (e.g., [0501.328.675]) and its wiring.

Section 2: Sourcing the Solution with XiaoHang Machinery Co.

From Code to Component, Fast

XiaoHang Machinery Co., Ltd. turns diagnostics into solutions.

Fault “BA”? We provide fast lead times on verified ZF filter kits.

Fault “B1-B6”? We stock the complete clutch repair kits (like [4681.298.014] for K1) needed for the overhaul.

Fault “3E”? We supply the correct speed sensors.

Our 20 years of technical support means we can help you confirm the fault code and ship the right part the first time, leveraging our competitive pricing and strong inventory.

Conclusion: The Partner That Speaks ZF

Don’t just read the code, solve it. Contact XiaoHang Machinery Co. for the technical expertise and rapid parts supply to fix any ZF fault.