P1644 Vehicle ID Block Corrupted or Not Programmed

How to Diagnose and Solve P1644 Vehicle ID Block Corrupted or Not Programmed Issues

As a seasoned car expert, I understand the frustration that comes with encountering a P1644 error code. This error signifies that your vehicle’s ID block is either corrupted or not programmed. But don’t worry, I’m here to help you diagnose and solve this issue.

Understanding the P1644 Error Code

The P1644 error code is a manufacturer-specific trouble code indicating a problem with the vehicle’s ID block. This block is a crucial part of your vehicle’s computer system, storing vital information about your car. When it’s corrupted or not programmed, it can lead to a host of problems.

What Causes the P1644 Error Code?

Several factors can lead to a P1644 error code. These include a faulty engine control module (ECM), a corrupted vehicle ID block, or a programming error.

Diagnosing the P1644 Error Code

Before you can fix the P1644 error code, you need to diagnose the problem. Here’s a step-by-step guide on how to do it:

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Step 1: Use an OBD-II Scanner

An OBD-II scanner is a handy tool that reads and diagnoses trouble codes in your vehicle. Connect it to your car’s diagnostic port and let it scan for any error codes.

Step 2: Interpret the Results

Once the scan is complete, the OBD-II scanner will display the error codes. If P1644 shows up, it confirms that your vehicle’s ID block is corrupted or not programmed.

Solving the P1644 Error Code

After diagnosing the problem, it’s time to solve it. Here’s how:

Step 1: Reset the ECM

Resetting the ECM can sometimes solve the P1644 error code. To do this, disconnect your car’s battery for about 30 minutes, then reconnect it. This process resets the ECM and may clear the error code.

Step 2: Reprogram the Vehicle ID Block

If resetting the ECM doesn’t work, you may need to reprogram the vehicle ID block. This process requires specialized software and should be done by a professional mechanic.

Step 3: Replace the ECM

If all else fails, you may need to replace the ECM. This is a last resort and should only be done if the ECM is confirmed to be faulty.

Preventing the P1644 Error Code

Prevention is always better than cure. Regular maintenance and timely software updates can help prevent the P1644 error code from occurring.


Dealing with a P1644 error code can be daunting, but with the right knowledge and tools, you can diagnose and solve this issue. Remember, if you’re unsure about any step, it’s always best to consult a professional mechanic.


1. What does the P1644 error code mean?

The P1644 error code means that your vehicle’s ID block is either corrupted or not programmed.

2. How can I diagnose the P1644 error code?

You can diagnose the P1644 error code using an OBD-II scanner.

3. How can I solve the P1644 error code?

You can solve the P1644 error code by resetting the ECM, reprogramming the vehicle ID block, or replacing the ECM if necessary.