P1570 error in Volkswagen cars concerns the immobilizer system, which is an added security system used to hinder or stop unwanted starting of the car engine. Whenever the problem shows up, it is possible for the car to start and die immediately or just refuse to crank. Below is the description of the probable reasons, signs, and methods used to correct this problem.
What is the P1570 Error Code?
The error P1570 indicates a malfunction in the immobilizer system that will prevent the engine from starting if it cannot recognize the key or recognizes a difference between key components like the ECU (Engine Control Unit) and the instrument cluster.
One of the most obvious symptoms is that the engine will start but shut down at once, meaning that the immobilizer is inhibiting further usage. In other cases, the engine won’t start at all. This is normally the case when there’s a communication issue between the key, the instrument cluster, and the ECU.
Possible Causes
There are several reasons that can
lead to this error. One of the most common is an unmatched key,
in which the immobilizer cannot
recognize the key due to synchronization issues.
Another reason could be a difference between the ECU and instrument cluster, which needs to be correctly matched in order for the system to function. If the ECU itself is not correctly matched or has been incorrectly programmed, the immobilizer will disable the engine from being started. Moreover, a malfunctioning ECU power supply, e.g., a bad relay or wiring fault, may keep the system from working as expected.
How to Fix the P1570 Error Code
To diagnose and correct the problem,
begin by checking for fault codes in the immobilizer system with an OBD-II scanner. This will indicate if there are any other errors that are
impacting the system. Then, check the immobilizer measuring values in the instrument cluster or control module to verify all of the components are synchronized correctly.
If the issue is key recognition, reprogramming of the ECU, instrument cluster, and key may be necessary. This can generally be done using special diagnostic equipment or by visiting a qualified tech. If the issue is power supply failure in the ECU, inspect the relay and wiring connections to see if the ECU is being fed the correct voltage.
NOTE: Before assuming the immobilizer is the problem, it’s important to rule out other potential causes of a no-start condition, such as fuel system or ignition issues. In some cases, performing a system reset can help. This involves disconnecting both battery terminals and briefly touching the cables together for about 15 seconds before reconnecting them. A weak or faulty battery can also cause immobilizer problems, so checking battery health is recommended before proceeding with more advanced troubleshooting.
If the issue persists after these steps, seeking professional assistance may be necessary. A Volkswagen dealership or experienced mechanic can provide advanced diagnostics and reprogramming if required.