P1612 Code - Chain of ECM-IMMU
Quick Answer
An immobilizer is an electronic device fitted to an automobile which prevents the engine from running unless the correct key is present. Common causes include Faulty or not programmed ignition key, Faulty IMMU, Faulty Engine Control Module (ECM). 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 indicates Chain of ECM-IMMU.
- Common causes
- Common causes include Faulty or not programmed ignition key, Faulty IMMU, Faulty Engine Control Module (ECM).
- 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.
Code P1612 Description
The microcircuit inside the key is activated by a small electromagnetic field which induces current to flow inside the key body, which in turn broadcasts a unique binary code which is read by the automobile's Engine Control Module (ECM). When the ECM determines that the coded key is both current and valid, the ECM activates the fuel-injection sequence.
The immobilizer function of the Infiniti Vehicle Immobilizer System (IVIS) or Nissan Anti-Theft System (NATS) consists of the following:
- NATS ignition key
- NATS antenna amp. located in the ignition key cylinder
- Body control module (BCM) or (IMMU)
- Engine Control Module (ECM)
- Security indicator lamp
What are the Possible Causes of the DTC P1612?
- Faulty or not programmed ignition key
- Faulty IMMU
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1612?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1612 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1612 code?
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Need Help with the Code?
Get the P1612 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1612 Audi — Engine Control Module Coding
- P1612 Buick — Loss Of IPM Serial Data
- P1612 Cadillac — Loss Of IPM Serial Data
- P1612 Chevrolet — Loss Of IPM Serial Data
- P1612 GMC — Loss Of IPM Serial Data
- P1612 Hyundai — Immobilizer Malfunction
- P1612 Infiniti — Chain of ECM-IMMU
- P1612 Nissan — Chain of ECM-IMMU
- P1612 Volkswagen — Engine Control Module Coding
Frequently Asked Questions about P1612 Code
1. What are the common symptoms of OBDII code P1612 - Chain of ECM-IMMU?
- Common symptoms include engine stalling, difficulty starting the vehicle, and the inability to shift gears.
2. What does the OBDII code P1612 indicate?
- OBDII code P1612 indicates a communication error between the Engine Control Module (ECM) and the Immobilizer Control Module (IMMU).
3. What are the possible causes of OBDII code P1612?
- Possible causes include a faulty ECM or IMMU, wiring issues, a dead battery, or a damaged key.
4. How can I diagnose OBDII code P1612?
- Diagnosis involves checking the connections between the ECM and IMMU, testing the battery voltage, and inspecting the key for damage.
5. How can I repair OBDII code P1612?
- Repair options include repairing or replacing faulty wiring, resetting the ECM and IMMU, reprogramming the key, or replacing the ECM or IMMU if necessary.
6. Can OBDII code P1612 be fixed without professional help?
- While some basic checks like inspecting connections and the key can be done by a DIYer, fixing the underlying issue may require professional diagnostic tools and expertise.
7. Is it safe to continue driving with OBDII code P1612 present?
- It is not recommended to drive the vehicle with OBDII code P1612 active, as it can lead to potential safety issues like stalling or sudden loss of power.
8. How much does it typically cost to repair OBDII code P1612?
- The cost of repair can vary depending on the specific cause of the code, but it may range from a simple wiring repair to a more costly ECM or IMMU replacement.
9. Will resetting the ECM clear OBDII code P1612?
- Resetting the ECM may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.
10. Can a low battery trigger OBDII code P1612?
- Yes, a low or dead battery can sometimes cause communication errors between the ECM and IMMU, leading to the triggering of OBDII code P1612.
Discuss the causes and fixes for P1612 OBDII Code
-
is there a way for me to bypass my 1999 infinity qx4 immobilizer electrically as in jumper wires etc and what ies the exzact purpose of each of the 5 wires on the immobilizer itself
-
There is no way to bypass the system. If there was a way to bypass the system it will defeat the purpose to have the system in the first place.
Here is the wire diagram for the unit, which indicates the exact purpose of each wire.
Click here to enlarge image -
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