The immobilizer is part of the car’s security system. This device prevents the engine from starting without the use of the transponder key, thus achieving a significant reduction in car thefts. Error Code: P1612.
Modern immobilizer systems use rolling codes through which it is possible to prevent the copy of the key code or the controller. The key is activated by an internal microcircuit activated by an electromagnetic field.
This electromagnetic field induces a voltage that flows in the key and produces or emits a binary code that reads the engine control module (NDE). If this driver detects that the key is valid, the injection sequence is allowed.
Error Code: P1612
When the DTC P1612 OBD2 is set, it is because the immobilizer has experienced incorrect operation. Specifically, in the Nissan vehicles this code indicates that the ECM has not received the identification signal or binary code that allows the engine to start.
Reads: P0112 OBD Error Code – Intake Air Temperature Sensor 1 Low Input Circuit
What does the P1612 code mean?
This code means an interruption of communication between the NDE and the IMMU. As a result, the engine does not start. Often it is simply related to using the wrong or damaged key, while other cases could point to a problem with the ECM or immobilizer.
Both Nissan and Infiniti use anti-theft systems and immobilizers with this feature. The components consist of:
What are the common causes of code P1612?
Occasionally, this occurs during the procedure. key registration and the code remains stored. Most commonly, this code is activated due to an unregistered key being used five consecutive times.
Other known causes are:
What are the symptoms of code P1612?
Is it difficult to fix the P1612 code?
There is no way to reprogram the key without dealer tools. If it is a problem with a loose connection, once the fault is found, repairing it only takes a few seconds.
How do you fix the P1612 code?
Questions and answers
Ask: I am getting a p1612 code-an incorrectly coded engine control module. I swapped a 2000 Jetta AEG Auto engine into my 99 Beetle AEG 5sp and now I am getting this code
For all I know, this code could have been floating around before the change… I have no way of knowing.
My question is: how can I find out why I’m getting this code and if I should worry about fixing it?
Answer: Have you ever made a peanut butter and jelly sandwich and ran out of peanut butter halfway through and had to grab more from another jar?
That’s what you have here. It’s all the same, but you know the difference. You need a vag com to “introduce” the 2 new parts together. shaking hands if you will. If you don’t care about the CEL I wouldn’t worry about it.
Answer: Sorry, I should have given more information. vagcom is what gives me this code I just don’t know how to fix it using. Is there a step-by-step out there?
And especially curious about what still tells you it’s a different engine. I have swapped the entire original engine onto the new Jetta engine now except the cam sensor maybe? and possibly the alternator….I don’t remember.
All accessories, coil packs, sensors, etc. are original to the car. I’m leaning towards maybe someone who changed the ECU years ago before I got it.
If you want to know other articles similar to Error Code P1612 you can visit the category Fault Codes.