P1622 Repeated Wrong ECM Security Code Fault

Land Rover OBD-II Trouble Codes -------------------------------------------------The diagnostic trouble code (DTC) P1622 indicates a "Repeated Wrong ECM (Engine Control Module) Security Code Fault." This code typically points to issues related to the security system and the ECM's security code.

Invalid Security Key Login,

Immobilizer Lockout Mode,

Anti-Theft Attempt Limit,

ECM Security Handshake Fail,

Smartra Authentication Error,

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Diagnostic Overview

• The System: This is a "lockout" code within the vehicle's Immobilizer system. While P1623 means a code mismatch, P1622 indicates that the Engine Control Module (ECM) has received the wrong security code multiple times in a row.

• The Result: As a security measure to prevent "brute force" hacking or theft, the ECM has entered a Security Lockout Mode. In this state, even if you use the correct key, the car may still refuse to start for a set period.

Common Failure Points

1. Wrong Key Usage: Attempting to start the car multiple times with a key that isn't programmed (or a key from a different car of the same model).

2. Defective Key Transponder: The chip inside your key may be failing, sending "garbled" or incorrect data intermittently. If you keep trying to crank the car, it triggers the P1622.

3. Smartra/Immobilizer Module Fault: The module responsible for translating the key signal to the ECM is malfunctioning and sending incorrect data strings.

4. ECM "Confusion": If you have two transponder keys on the same keychain, the antenna might try to read both at once, resulting in a "wrong code" signal being sent to the ECM.

Symptoms

• Start-and-Stall: The car may fire up for 1–2 seconds and then immediately die.

• Security Indicator: The "immobilizer" or "padlock" light on the dash may be flashing rapidly or stay illuminated.

• Lockout Period: You may find that the car won't even try to crank for a specific amount of time (often 15 to 60 minutes).

Troubleshooting Steps

• The "Cool Down" Period: Turn the ignition to the ON position (do not crank) and leave it there for at least 20 to 30 minutes. Many systems will "reset" the lockout timer if they see a steady "ON" signal without a start attempt.

• Isolate the Key: Remove all other keys, fobs, or electronic devices from your keychain. Only have the single ignition key near the steering column.

• Verify Key Battery: While the transponder chip usually doesn't need a battery to start the car, some "Integrated Key" systems (like those in many European cars) use the battery to boost the security signal.

• Clear Codes: Use a scan tool to clear the P1622. If the code returns immediately upon the first turn of the key, the key itself is likely damaged or "de-programmed."

Would you like me to find the specific "Wait Time" required for your vehicle to reset from a security lockout?

Understanding Immobilizer Security Lockout Codes

This video explains how the ECM counts failed login attempts and the steps required to exit a security lockout mode without needing a dealer tow.

Here are some possible causes and diagnostic steps for the P1622 code:

### Possible Causes:

1. **Incorrect Security Code Entry:** The security code entered during programming or reprogramming may be incorrect.

2. **Faulty Key or Key Transponder:** Issues with the vehicle's key or the key transponder that communicates with the security system.

3. **Faulty ECM Security System:** Malfunctions within the ECM's security system, including the security code verification process.

4. **Faulty Ignition Switch:** Problems with the ignition switch may affect the communication between the key and the security system.

### Diagnostic Steps:

1. **Verify Security Code Entry:** Double-check that the correct security code has been entered during programming or reprogramming. Ensure that there are no typos or errors in the code.

2. **Check Key and Transponder:** Inspect the vehicle's key for damage or wear. If the vehicle uses a key transponder, ensure it is functioning correctly. Replace a faulty key or transponder if necessary.

3. **Perform ECM Security System Diagnostics:** Use a diagnostic scan tool to perform diagnostics on the ECM's security system. Check for any specific error codes or issues related to security code verification.

4. **Inspect Ignition Switch:** Check the ignition switch for proper operation. Ensure that it is communicating effectively with the security system.

5. **Consult Manufacturer Resources:** Refer to the vehicle manufacturer's service information, technical service bulletins (TSBs), or resources for any known issues or updates related to the ECM security system.

6. **Reprogram ECM:** If the issue persists and there are no other apparent problems, reprogramming the ECM with the correct security code may resolve the fault.

7. **Consider Professional Assistance:** If you are unable to resolve the issue through the above steps, or if you are not familiar with ECM security system diagnostics, seeking assistance from a qualified mechanic or technician is advisable.

It's essential to address the repeated wrong ECM security code fault to ensure the proper functioning of the security system and the ECM. If in doubt or if the issue persists, seeking professional assistance is recommended for a thorough diagnosis and effective resolution.