Solving the P1778 Code on a Nissan Maxima: What You Need to Know

The P1778 code is a diagnostic trouble code (DTC) for a Nissan Maxima. This code is triggered when the transmission control module (TCM) detects an issue with the transmission pressure control solenoid. When this code is triggered, it indicates that there is an issue with the pressure control solenoid, which can lead to poor shifting performance and other transmission related issues. The most common cause of this code being triggered is a faulty or failing pressure control solenoid, however other causes could include a defective transmission pressure sensor, a contaminated transmission fluid, or an electrical issue with the wiring or connectors. In order to properly diagnose and repair this code, a trained technician should be consulted as soon as possible to ensure that any underlying issues are identified and repaired before they cause further damage to the vehicle’s transmission system.


Nissan Maxima vehicles are popular for their quality and dependability, but they can still experience common problems. Most of these issues are related to the vehicle’s engine, ignition switch, and wiring. The P1778 code is one of the more common engine codes associated with Nissan Maximas. It is important to understand what this code means and how to diagnose and fix it.


The most common symptom associated with the P1778 code is that the vehicle will not start or will struggle to start. Other symptoms may include engine misfires, a decrease in fuel economy, and a decrease in power output. In some cases, the Check Engine Light may be illuminated on the dashboard. It is important to note that any of these symptoms can be caused by other issues as well, so it is important to have a qualified mechanic diagnose your vehicle first before attempting any repairs.


The most common causes of the P1778 code are engine malfunctions, faulty ignition switches, or wiring issues. Engine malfunctions are typically caused by worn or damaged components such as spark plugs or fuel injectors. Faulty ignition switches can cause intermittent starting problems as well as difficulty starting in cold weather. Wiring issues can also lead to difficulty starting due to frayed or damaged wires that affect the flow of electricity in the vehicle’s electrical system.


Once you have determined what is causing your Nissan Maxima’s P1778 code, you can begin repairs accordingly. Repairing engine malfunctions involves replacing worn or damaged components such as spark plugs and fuel injectors with new ones. If your ignition switch is faulty, it should be replaced with a new one from an auto parts store. If wiring issues are causing your problem, you will need to inspect all wiring for frays or damage and repair it accordingly using electrical tape or other appropriate materials.


Nissan Maxima owners are responsible for properly caring for their vehicles in order to keep them running in peak condition. Regular maintenance and repairs are essential to keeping a Maxima running smoothly and avoiding expensive repair bills. One of the most common codes associated with the Nissan Maxima is P1778, which indicates a problem with the transmission control system. In this guide, we will discuss how to diagnose and repair this code, as well as provide some general tips on how to keep your Maxima running smoothly.

Diagnosing P1778 Code

The first step in diagnosing the P1778 code is to check the transmission control system for any signs of malfunction or failure. This can be done by connecting an OBD-II scanner to the vehicle’s computer system and retrieving any stored diagnostic trouble codes (DTCs). If a transmission-related DTC is found, it should be investigated further by a qualified technician. If no DTCs are found, a visual inspection of the wiring and connectors should be performed for any signs of damage or corrosion.

Repairing P1778 Code

Once the source of the P1778 code has been identified, it must be repaired before resetting the code. The most common cause of this code is a faulty transmission control module (TCM). The TCM is responsible for controlling various aspects of the transmission such as shift points and torque converter lockup. If the TCM is damaged or defective, it must be replaced before resetting the code. Other possible causes include wiring or connector issues, solenoid failures, or mechanical problems within the transmission itself.

Transmission Issues

Nissan Maxima owners may experience several common transmission issues including slipping gears, not shifting properly, stalling out, or dashboard lights illuminating unexpectedly. If these symptoms occur, it’s important to have your vehicle inspected by a qualified technician as soon as possible in order to prevent further damage to your vehicle’s transmission system.

Electrical Problems

Electrical problems can also cause issues with your Nissan Maxima’s transmission system such as stalling out or dashboard lights illuminating unexpectedly. It’s important to have your vehicle inspected by a qualified technician if these symptoms occur in order to identify any underlying electrical issues that may be causing them.

Brake Troubles

Brake troubles can also cause issues with your Nissan Maxima’s transmission system such as squealing and grinding noises or uneven wear on brake pads. It’s important to have your vehicle inspected by a qualified technician if these symptoms occur in order to identify any underlying brake issues that may be causing them.

Maintenance Tips For NissanMaxima Owners

In order to keep your Nissan Maxima running smoothly for many years to come, regular maintenance and inspections are essential components of ownership. Routine maintenance items such as oil changes should always be performed according to manufacturer recommendations in order to ensure optimal performance from your vehicle’s engine and other components. Additionally, inspections should also be performed regularly in order to identify any potential problems early on before they become more serious and expensive repairs down the road. By following these simple tips you can keep your Nissan Maxima running like new for many years down the road!

FAQ & Answers

Q: What is P1778 code for Nissan Maxima?
A: P1778 is an OBD-II trouble code associated with the transmission range sensor circuit malfunction of a Nissan Maxima.

Q: What are the common problems with Nissan Maxima vehicles?
A: Common problems with Nissan Maxima vehicles include transmission issues such as slipping gears or failure to shift properly, electrical problems such as stalling out and dashboard lights illuminating unexpectedly, and brake troubles such as squealing and grinding noises or uneven wear on brake pads.

Q: What are some solutions to the engine malfunction associated with P1778 code?
A: Solutions to the engine malfunction associated with P1778 code include repairing the engine malfunction, replacing the ignition switch, and resolving any wiring issues.

Q: What are some maintenance tips for Nissan Maxima owners?
A: Maintenance tips for Nissan Maxima owners include regularly changing the oil, checking and replacing other fluids, performing regular inspections of all belts and hoses, visually inspecting exhaust systems for leaks or damage, testing battery performance regularly, and checking tire pressures at least once a month.

Q: How often should I change the oil in my Nissan Maxima?
A: It is recommended that you change your oil every 3 months or every 5,000 miles. However, it is best to consult your owner’s manual or an automotive technician for accurate information about specific maintenance schedules for your vehicle.

The Nissan Maxima is a reliable and dependable automobile that has been on the market for many years. It offers a comfortable ride, good fuel economy, and a variety of features to suit any budget. With its reasonable pricing, reliable components, and great performance, the Nissan Maxima is an excellent choice for those looking for an affordable yet dependable vehicle.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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