2017 Nissan Armada Transmission Problems

The 2017 Nissan Armada, a robust and capable SUV, quickly gained popularity for its powerful engine, spacious interior, and towing prowess. However, like any complex machine, it's not immune to potential issues. One area that has garnered attention, and sometimes concern, is the transmission. While not every 2017 Armada experiences problems, understanding the potential issues, their causes, and possible solutions is crucial for both owners and those considering purchasing this vehicle. This guide delves deep into the common transmission problems reported in the 2017 Nissan Armada, offering a technical and analytical perspective.

Understanding the 2017 Armada's Transmission

At the heart of the 2017 Armada lies the RE7R01A, a 7-speed automatic transmission manufactured by Jatco (a Nissan subsidiary). This electronically controlled transmission is designed for longitudinal engine configurations and rear-wheel-drive (or four-wheel-drive) applications. It features a conventional torque converter, planetary gearsets, and multiple clutches and brakes for smooth and efficient gear changes. The transmission control module (TCM) manages the shift points, adapting to driving conditions and driver input for optimal performance and fuel economy.

The RE7R01A relies heavily on sensors and actuators for its operation. Input speed sensors monitor the rotational speed of the turbine shaft, while output speed sensors track the speed of the output shaft. These sensors provide crucial data to the TCM, which then commands the various solenoids to control fluid pressure to the clutches and brakes within the transmission. Proper fluid pressure is critical for smooth and reliable gear shifting.

Common Transmission Problems in the 2017 Armada

Several issues have been reported by 2017 Armada owners regarding the transmission. These range from minor inconveniences to more serious malfunctions that can impact drivability. We'll break down some of the most prevalent problems:

1. Rough or Harsh Shifting

This is a relatively common complaint, often described as clunky or jerky gear changes, especially during upshifts or downshifts. Several factors can contribute to rough shifting:

Low or Dirty Transmission Fluid: Transmission fluid serves as a lubricant, coolant, and hydraulic fluid. Low fluid levels reduce hydraulic pressure, leading to delayed or harsh shifts. Dirty fluid contains contaminants that can clog valve bodies and solenoids, further disrupting smooth operation. Regular fluid changes are crucial.
Faulty Solenoids: The solenoids within the transmission control the flow of fluid to the various clutches and brakes. A malfunctioning solenoid can cause incorrect pressure regulation, resulting in harsh shifts. Diagnostic trouble codes (DTCs) related to specific solenoids can help pinpoint the problem.
Valve Body Issues: The valve body is a complex hydraulic control center that directs fluid to the appropriate components. Wear and tear, or contamination, can cause valves to stick or malfunction, leading to irregular shifting patterns. In some cases, the entire valve body may need to be replaced.
Software Glitches: The TCM relies on software to manage the transmission's operation. Software bugs or outdated programming can sometimes cause shifting irregularities. A software update from a Nissan dealer may resolve these issues.

2. Transmission Slipping

Slipping occurs when the engine RPM increases without a corresponding increase in vehicle speed. This indicates that the clutches within the transmission are not fully engaging. Transmission slipping is a serious problem that can lead to significant damage if left unaddressed.

Worn Clutches: Over time, the friction material on the clutch plates can wear down, reducing their ability to grip. This can cause slippage, especially under heavy load. A transmission rebuild or replacement may be necessary.
Low Fluid Pressure: Insufficient fluid pressure prevents the clutches from engaging fully. This can be caused by low fluid levels, a faulty pump, or internal leaks.
Torque Converter Problems: The torque converter is responsible for transferring power from the engine to the transmission. A malfunctioning torque converter can cause slippage, particularly during acceleration.

3. Delayed Engagement

Delayed engagement refers to a noticeable delay between selecting a gear (e.g., Drive or Reverse) and the transmission actually engaging. This can be accompanied by a clunking or thudding sound.

Low Fluid Level: Similar to slipping, low fluid levels can prevent the transmission from engaging quickly.
Internal Leaks: Leaks within the transmission can reduce hydraulic pressure, leading to delayed engagement. Common leak points include seals and gaskets.
Valve Body Issues: Sticking valves in the valve body can prevent fluid from reaching the appropriate clutches quickly.

4. Overheating

Transmission overheating can be a silent killer. Excessive heat can damage the internal components, leading to premature failure. The 2017 Armada has a transmission fluid temperature (TFT) sensor that monitors the fluid temperature. If the TCM detects excessive heat, it may illuminate a warning light.

Heavy Towing: Towing heavy loads can significantly increase the load on the transmission, generating more heat. Ensure the Armada is properly equipped for towing, and consider adding an aftermarket transmission cooler.
Low Fluid Level: Low fluid levels reduce the transmission's ability to dissipate heat effectively.
Clogged Transmission Cooler: The transmission cooler is responsible for removing heat from the fluid. A clogged cooler can restrict flow, leading to overheating.

5. Diagnostic Trouble Codes (DTCs)

When a transmission problem occurs, the TCM often stores a DTC. These codes can provide valuable clues about the nature of the problem. Common transmission-related DTCs for the 2017 Armada include:

P0700: Transmission Control System Malfunction
P0715: Input/Turbine Speed Sensor Circuit Malfunction
P0720: Output Speed Sensor Circuit Malfunction
P0729: Gear 6 Incorrect Ratio
P0730: Incorrect Gear Ratio
P0731-P0737: Incorrect Gear Ratio (Specific Gears)
P0740: Torque Converter Clutch Circuit Malfunction
P0776: Pressure Control Solenoid "B" Performance or Stuck Off

It's important to note that DTCs are just starting points. Further diagnosis is often required to pinpoint the root cause of the problem.

Troubleshooting and Potential Solutions

Addressing transmission problems in the 2017 Armada requires a systematic approach. Here's a general troubleshooting guide:

Check the Transmission Fluid Level and Condition: This is the first and easiest step. Ensure the fluid level is within the proper range and that the fluid is clean and red or pink in color. If the fluid is dark brown or black, or smells burnt, it needs to be changed.
Scan for DTCs: Use an OBD-II scanner to retrieve any stored DTCs. Research the codes to understand the potential problems.
Perform a Visual Inspection: Look for any signs of leaks around the transmission housing, seals, and cooler lines.
Test the Solenoids: Using a multimeter, you can test the resistance of the solenoids to see if they are within the manufacturer's specifications.
Consider a Transmission Flush or Fluid Change: If the fluid is dirty, a transmission flush or fluid change may help improve shifting performance. However, it's important to use the correct type of fluid specified by Nissan.
Consult a Qualified Technician: If you're not comfortable working on transmissions, it's best to take the vehicle to a qualified technician who specializes in automatic transmissions. They have the expertise and equipment to diagnose and repair complex transmission problems.

Preventative Maintenance

The best way to avoid transmission problems is to perform regular preventative maintenance. Here are some key recommendations:

Follow the Recommended Service Schedule: Nissan recommends changing the transmission fluid every 60,000 miles under normal driving conditions. However, if you frequently tow heavy loads or drive in harsh conditions, you may need to change the fluid more often.
Use the Correct Transmission Fluid: Always use the type of transmission fluid specified by Nissan. Using the wrong fluid can damage the transmission. Matic S is often the specified fluid for this unit.
Avoid Overloading the Vehicle: Exceeding the vehicle's towing capacity can put excessive strain on the transmission, leading to overheating and premature wear.
Consider a Transmission Cooler: If you frequently tow heavy loads, consider installing an aftermarket transmission cooler to help keep the fluid temperature within a safe range.

Conclusion

The 2017 Nissan Armada is a capable and reliable SUV, but like any vehicle, it's susceptible to potential transmission problems. By understanding the common issues, their causes, and potential solutions, owners can proactively address problems and extend the life of their transmission. Regular maintenance, proper driving habits, and prompt attention to any warning signs are crucial for ensuring the longevity and performance of the 2017 Armada's transmission. While some issues may require professional attention, a basic understanding of the system can empower owners to make informed decisions and communicate effectively with their mechanics. Remember, prevention is always better (and cheaper) than cure.