The P2851 Nissan code is an indication that the transmission control module (TCM) has detected an abnormal correlation between shift fork position sensors ‘A’ and ‘B.’
If left unchecked, this code can cause an array of symptoms such as engine light ON, transmission shifting problems, and poor fuel economy.
To diagnose the P2851 code, a qualified technician will need to visually inspect the wiring harness and connectors.
Read on to learn more about the causes, symptoms, solutions, and cost to diagnose this code.
Key Takeaways
- The P2851 Nissan Code can be caused by various factors such as an outdated Transmission Control Module (TCM) program, faulty TCM, faulty transmission assembly, safety recalls, or other potential causes.
- To fix the P2851 Nissan Code, it is recommended to check the possible causes listed, visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector pins. Checking for any Factory Service Bulletins related to the code is also advisable.
- The cost to diagnose the P2851 Nissan Code can vary depending on factors such as labor rates, location, make and model of the vehicle, and engine type. Most auto repair shops charge between $75 and $150 per hour for labor.
- The main symptom of the P2851 Nissan Code is the Engine Light being ON or the Service Engine Soon Warning Light.
Causes of P2851 Nissan Code
The P2851 Nissan Code is typically caused by an outdated Transmission Control Module (TCM) program, a faulty TCM, a faulty Transmission Assembly, or potential Safety Recalls.
To diagnose and repair this issue, it is important to look for any damaged components, broken or corroded connector pins, or any other potential causes. Visually inspecting the wiring harness and connectors can help identify any issues that may be causing the P2851 code.
Additionally, it is important to check for Factory Service Bulletins that may be related to the code.
With a thorough diagnosis and the right repair procedure, the P2851 code can be successfully fixed, restoring the vehicle to its optimal performance.
Diagnosing the P2851 Nissan Code
Diagnosing the issue of the P2851 code requires a thorough check of the Transmission Control Module (TCM) and Transmission Assembly to identify the root cause. It is important to check for any wiring harness or connector damage, as well as broken pins or corroded connectors.
The labor cost for diagnosing this code usually ranges from $75 to $150 per hour and the diagnosis time and labor rates vary. It is also important to check for any safety recalls related to the P2851 code. Additionally, accessing the factory service manuals is beneficial in understanding the exact issue.
With the right knowledge and resources, the P2851 code can be diagnosed and resolved.
Solutions for P2851 Nissan Code
Resolving the P2851 Nissan Code requires a comprehensive examination of the Transmission Control Module (TCM) and Transmission Assembly to identify the underlying cause.
The TCM must be thoroughly checked for outdated programming or faulty components, while the Transmission Assembly must be inspected for physical damage.
To ensure the most effective repair, technicians should consult the Factory Service Bulletin for the P2851 code, and use specialised diagnostic tools to assess the system.
A full visual inspection of the wiring harness and connectors should also be carried out to identify any broken, bent, pushed out, or corroded pins.
Finally, all potential causes should be verified to make sure that the underlying issue is addressed.
Troubleshooting the P2851 Nissan Code
Troubleshooting the P2851 requires a comprehensive inspection of the Transmission Control Module and Transmission Assembly to identify the source of the issue.
To begin, ensure that the Transmission Control Module is up-to-date with the latest programming. Additionally, inspect the wiring harness and connectors for any damage. Check for broken, bent, pushed out, or corroded connector pins.
It is also important to look for any safety recalls associated with the P2851 code. Finally, read all available Factory Service Bulletins to get a full understanding of the issue.
Video Help for a Nissan Transmission Control Module
With the P2851 Nissan code being related to the TCM, I wanted to make sure and share this awesome video by the Youtuber HVAC Mechanic that provides a ton of transmission control module information in this short 4 minute video. Goes into symptoms as well as how to test if your’s has gone bad. Click the red play button below to watch it.
Frequently Asked Questions
Is the P2851 Nissan Code Related to Other Codes?
Yes, the P2851 Nissan code is related to other codes. It can be caused by outdated transmission control module (TCM) program, faulty TCM, faulty transmission assembly, safety recalls, and other potential issues. Appropriate steps should be taken to diagnose and fix the code.
What Other Symptoms Can Be Caused by the P2851 Nissan Code?
Other symptoms that can be caused by the P2851 Nissan Code include engine light being on (or Service Engine Soon Warning Light). Additionally, there may be issues with the transmission control module (TCM), transmission assembly, or outdated TCM program.
Is It Possible to Diagnose and Fix the P2851 Nissan Code Without a Professional?
It is possible to diagnose and fix the P2851 Nissan code without a professional, however it is recommended that a licensed mechanic be consulted in order to ensure accuracy and safety. The steps to resolving the issue can be found online and in service manuals.
What Is the Estimated Cost of Diagnosing and Repairing the P2851 Nissan Code?
The estimated cost of diagnosing and repairing the P2851 Nissan code can vary depending on location, make and model of the vehicle, and engine type. Most auto repair shops charge between $75 and $150 per hour for labor and diagnosis.
Is There a Specific Model of Nissan Vehicle That Is More Prone to the P2851 Nissan Code?
No specific model of Nissan vehicle is more prone to the P2851 code. However, some older models may be more likely to experience this issue due to outdated programming and other components. It is important to check for recalls and inspect the wiring and components to ensure proper diagnosis and repair.
Final Thoughts
In conclusion, the P2851 Nissan code is triggered when the transmission control module (TCM) detects an abnormal correlation between the two shift fork sensors.
To address the code, a qualified technician should visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector pins.
If left unchecked, the P2851 code can lead to further transmission damage, and should be addressed immediately.
