How to fix VW 01314 / Volkswagen Error Code 01314

 How to fix VW 01314 / Volkswagen  Error Code 01314 - Engine Control Module

When encountering error code 01314 in a Volkswagen vehicle, it indicates a problem with the communication between the Engine Control Module (ECM) and other vehicle systems. Here are the possible causes and solutions for this error:

Possible Causes:

1. CAN-Databus Wiring/Connectors from/to Engine Control Module are faulty.

2. There may be fault(s) stored in the Engine Control Module.

3. The Engine Control Module may have been recently flashed or re-mapped.


To address error code 01314, consider the following steps:

1. Check CAN-Databus Wiring/Connectors:

Begin by inspecting the wiring and connectors associated with the CAN-Databus that connects to the Engine Control Module. Look for any signs of damage, loose connections, or corrosion that may be impeding communication.

2. Check Measuring Value Blocks (MVB):

 Review the Measuring Value Blocks (MVB) to assess the current Communication Status. Typically, Measuring Value Blocks numbered 125 and above provide insights into communication status.

Special Notes:

- In cases where the error is found in the (1K) chassis with a 2.5L gas engine using a Mass Air Flow (MAF) sensor (G70), it's essential to check the T121/62 (Red/Black) traced power wire leading to the ECM. If power is missing or a voltage drop is present, this wire may be damaged anywhere between 6" and 18" from the connector. Such damage can result in both a communication issue and a no-start condition.

Error Code 01314 - Engine Control Module: Check DTC Memory

This variation of error code 01314 suggests that there are fault codes stored in the Engine Control Module (ECM) that need to be checked.


- Fault(s) stored in the Engine Control Module.


To address this issue, check the Engine Control Module for fault codes and address any problems indicated.

Special Notes:

- It's important to understand that when the Engine Control Module stores a code that influences the functionality of other control modules, you need to correct the problem in the Engine Control Module first before attempting to clear the fault code.

By following these steps and addressing any identified issues, you can diagnose and potentially resolve error code 01314 in your Volkswagen vehicle. This will help ensure proper communication between the ECM and other vehicle systems.

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