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P0797 2005 Nissan Altima Sedan Code - Pressure Control Solenoid 'C' Stuck On

Quick Answer

The diagnostic trouble code P0797 for a 2005 Nissan Altima Sedan indicates an issue with the Pressure Control Solenoid 'C' being stuck on. Common causes include Faulty Pressure Control Solenoid 'C': The solenoid itself may be malfunctioning, causing it to remain in the on position, Electrical issues: Wiring harness or connector problems can disrupt the communication between the solenoid and the vehicle's engine control module, Low transmission fluid level: Insufficient fluid levels can affect the solenoid's performance and lead to pressure control issues. 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
P0797 2005 Nissan Altima Sedan indicates Pressure Control Solenoid 'C' Stuck On.
Common causes
Common causes include Faulty Pressure Control Solenoid 'C': The solenoid itself may be malfunctioning, causing it to remain in the on position, Electrical issues: Wiring harness or connector problems can disrupt the communication between the solenoid and the vehicle's engine control module, Low transmission fluid level: Insufficient fluid levels can affect the solenoid's performance and lead to pressure control issues.
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 Sep 07, 2024
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Code P0797 2005 Nissan Altima Sedan Description

The diagnostic trouble code P0797 for a 2005 Nissan Altima Sedan indicates an issue with the Pressure Control Solenoid 'C' being stuck on. This solenoid is a vital component of the transmission system responsible for regulating hydraulic pressure within the transmission. When the solenoid is stuck in the on position, it can lead to a variety of performance issues and potentially cause damage to other parts of the transmission system if not addressed promptly.

OBDII Code P0797 2005 Nissan Altima Sedan - Pressure Control Solenoid 'C' Stuck On
P0797 2005 Nissan Altima Sedan Code - Pressure Control Solenoid 'C' Stuck On

Common Causes of P0797 2005 Nissan Altima Sedan

  1. Faulty Pressure Control Solenoid 'C': The solenoid itself may be malfunctioning, causing it to remain in the on position.
  2. Electrical issues: Wiring harness or connector problems can disrupt the communication between the solenoid and the vehicle's engine control module.
  3. Low transmission fluid level: Insufficient fluid levels can affect the solenoid's performance and lead to pressure control issues.
  4. Mechanical blockages: Debris or contaminants in the transmission system can obstruct the solenoid's operation, causing it to get stuck.
  5. Internal transmission damage: Wear and tear on internal components can affect the solenoid's function and lead to it being stuck on.

Symptoms of P0797 2005 Nissan Altima Sedan

  1. Harsh or delayed shifting: The vehicle may exhibit rough or delayed gear shifts, especially when accelerating or decelerating.
  2. Slipping transmission: The transmission may slip out of gear intermittently, causing a loss of power or erratic behavior.
  3. Transmission overheating: The transmission fluid may overheat due to the increased pressure, leading to potential damage to internal components.
  4. Check Engine Light: The vehicle's onboard diagnostic system may illuminate the Check Engine Light to alert the driver of a potential issue with the transmission.

How to Fix P0797 2005 Nissan Altima Sedan

  1. Diagnose the issue: Use a scan tool to retrieve the trouble code and perform a thorough inspection of the transmission system to pinpoint the exact cause of the problem.
  2. Replace Pressure Control Solenoid 'C': Remove the faulty solenoid and install a new one to restore proper pressure control within the transmission.
  3. Check wiring and connectors: Inspect the wiring harness and connectors for any damage or corrosion, repairing or replacing as necessary to ensure proper electrical connectivity.
  4. Flush and refill transmission fluid: Drain the old transmission fluid, flush the system to remove contaminants, and refill with the manufacturer-recommended fluid to ensure optimal performance.
  5. Test drive and relearn procedure: After completing the repairs, test drive the vehicle to verify that the issue has been resolved. Perform any necessary relearn procedures to recalibrate the transmission system for optimal performance.

Cost to Fix P0797 2005 Nissan Altima Sedan

The cost of repairing a Pressure Control Solenoid 'C' stuck on issue in a 2005 Nissan Altima Sedan can vary depending on the extent of the damage and the specific parts and labor rates in your area. Generally, the replacement solenoid itself can range from $100 to $300, with additional costs for transmission fluid, wiring repairs, and labor. Overall, you can expect to pay anywhere from $300 to $800 for this repair, including parts and labor. Keep in mind that rates at auto repair shops may vary, so it's advisable to get quotes from multiple sources for a more accurate estimate. Additionally, factors such as the vehicle's make and model, location, and the severity of the issue can all impact the final cost of the repair.

What does this mean?

Tech Notes for P0797 2005 Nissan Altima Sedan

When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

When is the Code Detected?

The gear required by the ECM does not match the actual gear when driving

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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 P0797 2005 Nissan Altima Sedan Code

1. What does the OBDII code P0797 mean for a 2005 Nissan Altima Sedan?

P0797 indicates that the Pressure Control Solenoid 'C' in the transmission is stuck in the "on" position, affecting gear shifting or transmission performance.

2. What are the symptoms of the P0797 code in a 2005 Nissan Altima?

Symptoms may include harsh or erratic shifting, poor acceleration, transmission slipping, or the vehicle being stuck in one gear.

3. What causes the P0797 code to appear in a 2005 Nissan Altima?

Common causes include a faulty pressure control solenoid, dirty or low transmission fluid, wiring issues, or a malfunctioning transmission control module (TCM).

4. Can I drive my 2005 Nissan Altima with the P0797 code?

It's not recommended to drive with this code, as it can lead to further transmission damage or unsafe driving conditions due to shifting issues.

5. How do I diagnose the P0797 code in my 2005 Nissan Altima?

Diagnosis typically involves scanning for codes, inspecting wiring and connectors, checking transmission fluid levels, and testing the pressure control solenoid.

6. How can I fix the P0797 code on my 2005 Nissan Altima?

Repairs may include replacing the faulty pressure control solenoid, cleaning or replacing the transmission fluid, fixing wiring issues, or reprogramming the TCM.

7. How much does it cost to fix the P0797 code in a 2005 Nissan Altima?

Repair costs can range from $200 to $800 or more, depending on whether the solenoid, fluid, or other transmission components need replacement.

8. Can a dirty transmission filter cause the P0797 code?

Yes, a clogged transmission filter can restrict fluid flow, causing solenoid issues and triggering the P0797 code.

9. Does resetting the code clear the P0797 issue in a 2005 Nissan Altima?

Clearing the code without addressing the root cause will not fix the problem; the code is likely to return until the underlying issue is resolved.

10. How often should I check my transmission fluid to avoid codes like P0797?

Transmission fluid should be checked regularly, typically every 30,000 to 60,000 miles, depending on the manufacturer's recommendations.

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