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P1612 Nissan Code - Chain of ECM-IMMU

Quick Answer

The P1612 code for Nissan vehicles indicates a communication error between the Engine Control Module (ECM) and the Immobilizer Control Module (IMMU). Common causes include Faulty ECM or IMMU, Wiring or connection issues between ECM and IMMU, Low battery voltage affecting communication. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1612 Nissan indicates Chain of ECM-IMMU.
Common causes
Common causes include Faulty ECM or IMMU, Wiring or connection issues between ECM and IMMU, Low battery voltage affecting communication.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P1612 Nissan Description

The P1612 code for Nissan vehicles indicates a communication error between the Engine Control Module (ECM) and the Immobilizer Control Module (IMMU). The ECM and IMMU work together to ensure that the vehicle starts and runs properly. When this chain of communication is disrupted, it can lead to starting issues, stalling, or even prevent the vehicle from starting altogether. This code can also trigger the vehicle's security system, causing the engine to shut off as a safety measure.

OBDII Code P1612 Nissan - Chain of ECM-IMMU
P1612 Nissan Code - Chain of ECM-IMMU

Common Causes of P1612 Nissan

  1. Faulty ECM or IMMU
  2. Wiring or connection issues between ECM and IMMU
  3. Low battery voltage affecting communication
  4. Software or programming issues
  5. Immobilizer system malfunctions

Symptoms of P1612 Nissan

  1. Engine cranks but does not start
  2. Engine stalls shortly after starting
  3. Security light illuminated on the dashboard
  4. Increased fuel consumption
  5. Loss of power while driving

How to Fix P1612 Nissan

  1. Perform a thorough diagnosis to identify the exact cause of the communication error.
  2. Inspect wiring and connections between ECM and IMMU for any signs of damage or corrosion.
  3. Check battery voltage and perform necessary charging or replacement.
  4. Update software or reprogram modules if needed.
  5. Replace faulty ECM or IMMU if diagnosis indicates a component failure.

Cost to Fix P1612 Nissan

Repair costs for a P1612 code can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. However, prices may fluctuate based on location, vehicle make and model, and the extent of the repair needed. It's advisable to consult with a trusted mechanic or dealership to get an accurate estimate for your particular situation.

What does this mean?

Tech Notes for P1612 Nissan

This code is usually triggered when a not registered or damaged key is used to start the engine. When the starting operation is carried out five or more times consecutively with the same unregistered key, the system will lock.

If the problem occurs try disconnecting the car battery for about 30 minutes and then try starting the engine with a known registered key. If the problem persists you have to have the dealer erase the code and reprogram the keys again.

When is the Code Detected?

Communication impossible between ECM and IMMU (In rare cases, “CHAIN OF ECM-IMMU” might be stored during key registration procedure, even if the system is not malfunctioning.)

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1612 Nissan Code

1. What does the OBDII code P1612 for Nissan mean?

The P1612 code indicates a communication error between the Engine Control Module (ECM) and the Immobilizer Control Module (IMMU).

2. What are the common symptoms of the P1612 code in a Nissan vehicle?

Common symptoms include no-start conditions, engine stalling, and the immobilizer light staying illuminated on the dashboard.

3. What are some possible causes of the P1612 code in a Nissan?

Possible causes include a faulty IMMU, ECM, wiring issues between the modules, a drained car battery, or a failed key fob.

4. How can I diagnose the P1612 code in my Nissan vehicle?

Diagnosis typically involves using a diagnostic scanner to read the code, checking for related trouble codes, and performing a thorough inspection of the ECM, IMMU, and their connections.

5. Can I still drive my Nissan with the P1612 code present?

It is not recommended to drive your vehicle with the P1612 code as it may lead to sudden stalling or difficulty starting the engine.

6. How can I repair the P1612 code in my Nissan?

Repair options include reprogramming or replacing the ECM and IMMU, repairing any damaged wiring, ensuring the key fob is functioning properly, and reprogramming keys if necessary.

7. Is the P1612 code specific to certain Nissan models?

The P1612 code is commonly associated with Nissan vehicles equipped with NATS (Nissan Anti-Theft System) such as the Altima, Rogue, and Sentra.

8. Can a DIY enthusiast fix the P1612 code issue in a Nissan?

While some basic troubleshooting steps can be performed by DIY enthusiasts, fixing the P1612 code often requires specialized tools and expertise, so it is recommended to seek professional help.

9. How much does it cost to repair the P1612 code in a Nissan?

The cost of repair can vary depending on the specific issue causing the P1612 code, but it may range from a couple of hundred dollars for minor fixes to over a thousand dollars for more complex repairs.

10. How can I prevent the P1612 code from reoccurring in my Nissan?

To prevent the P1612 code from coming back, it's important to maintain your vehicle's battery health, avoid using aftermarket keys or key fobs, and address any related issues promptly to ensure proper communication between the ECM and IMMU.

Discuss the causes and fixes for P1612 Nissan OBDII Code

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  • Have 2003 Nissan Altima codes p 1612 and p 1614 have not taken to dealer as car does not start with either factory key ? Please help if there is another way to get key to start car ?

    Reply to Comment

  • You could try disconnecting the car battery for about 2-3 hours. Sometimes that may reset the system and allow the key to start the engine, otherwise there is no other way to program the keys without the dealer tools.

    Reply to Comment

  • I am having codes P1612 and P1610 on my nissan xtrail t30 diesel yd22 engine. I have disconnect batteries for at least 12hours but even the engine does not start. I tried with a duplicate key which was also programmed for same car.

    Now i am not able to reset this code and the car is not starting.

    Can you advice

    Reply to Comment