Diagnosis and Repair of Valvetronic Error 135401

🔧 Diagnosis and Repair of Valvetronic Error 135401

Error 135401 indicates an overload of the Valvetronic amplifier. This is often caused by a failed driver chip inside the DME (MEVD17.2.x) or a shorted Valvetronic motor.

1. 📋 Initial Checks

• Scan the DME using ISTA, INPA, or Launch tools.

• Inspect the Valvetronic motor connector and wiring harness.

• Check for voltage on the motor pins (typically 12V with ignition on).

• Attempt Valvetronic adaptation in ISTA:

  • If adaptation fails, the issue likely lies in the DME or motor.

2. 🔍 Test Using a Known-Good Motor

• Disconnect the original Valvetronic motor.

• Connect a working motor externally (off-engine).

• Retry adaptation.

  • If error disappears: the original motor or mechanical system is faulty.

  • If error remains: the DME driver circuit is likely damaged.

3. 🛠️ DME Repair Procedure

• Open the DME unit (MEVD17.2.x).

• Locate the TLE7183F motor driver chip — often damaged in overload scenarios.

• Desolder and replace with a new, original TLE7183F chip.

• Clean the board, reassemble the DME, and reseal it.

• Reinstall and run Valvetronic adaptation again.

4. ✅ Post-Repair Checks

• Ensure all faults are cleared.

• Monitor idle behavior and throttle response.

• Perform a short test drive to confirm stability.

• If needed, update the DME firmware to the latest version.

Tags: Valvetronic, 135401, BMW, DME fault, diagnostics, actuator, repair, end stop setup, N20, N55