Engine-Codes.com
Engine-Codes – Toyota – P2799 Toyota

P2799 Toyota Code - Auxiliary Transmission Fluid Pump Control Circuit High

Quick Answer

The P2799 diagnostic trouble code (DTC) for Toyota vehicles indicates a problem with the auxiliary transmission fluid pump control circuit being too high. Common causes include Faulty auxiliary transmission fluid pump, Wiring or connector issues in the control circuit, Corrosion or damage to electrical connections. 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
P2799 Toyota indicates Auxiliary Transmission Fluid Pump Control Circuit High.
Common causes
Common causes include Faulty auxiliary transmission fluid pump, Wiring or connector issues in the control circuit, Corrosion or damage to electrical connections.
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 06, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P2799 Toyota Description

The P2799 diagnostic trouble code (DTC) for Toyota vehicles indicates a problem with the auxiliary transmission fluid pump control circuit being too high. The auxiliary transmission fluid pump is responsible for ensuring proper lubrication and cooling of the transmission system, especially during heavy loads or high temperatures. When the control circuit for this pump is reading higher than normal, it can lead to issues with transmission performance, efficiency, and overall vehicle drivability.

OBDII Code P2799 Toyota - Auxiliary Transmission Fluid Pump Control Circuit High
P2799 Toyota Code - Auxiliary Transmission Fluid Pump Control Circuit High

Common Causes of P2799 Toyota

  1. Faulty auxiliary transmission fluid pump
  2. Wiring or connector issues in the control circuit
  3. Corrosion or damage to electrical connections
  4. Malfunctioning transmission control module (TCM)
  5. Software glitches or programming errors in the TCM

Symptoms of P2799 Toyota

  1. Harsh shifting or delayed shifting of gears
  2. Transmission slipping or jerking during acceleration
  3. Illumination of the check engine light
  4. Reduced fuel efficiency
  5. Transmission overheating warning light

How to Fix P2799 Toyota

  1. Begin by using a scan tool to diagnose the specific cause of the high circuit voltage in the auxiliary transmission fluid pump control circuit.
  2. Inspect the wiring, connectors, and electrical connections for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the auxiliary transmission fluid pump itself to ensure it is functioning correctly. Replace if faulty.
  4. Clear the DTC from the vehicle's memory and reset the transmission control module to ensure proper communication and operation.
  5. Road test the vehicle to verify that the issue has been resolved and that the transmission is operating smoothly.

Cost to Fix P2799 Toyota

The cost of repairing a P2799 code for a Toyota vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this problem can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostics or repairs may be needed if other related components are found to be faulty. It is advisable to consult with a certified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model.

Need more information about the P2799 Toyota code?

Need more information on how to fix the P2799 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2799 Toyota code diagnosed by a professional: Find a repair shop in your area

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 P2799 Toyota Code

1. What are the common symptoms of OBDII code P2799 in a Toyota related to the Auxiliary Transmission Fluid Pump Control Circuit High?

The common symptoms include difficulty shifting gears, transmission slippage, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P2799 in a Toyota?

Possible causes include a faulty auxiliary transmission fluid pump, damaged wiring or connectors in the pump circuit, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose the issue causing OBDII code P2799 in my Toyota?

Diagnosis typically involves checking the transmission fluid level and quality, inspecting the wiring and connectors in the pump circuit, and testing the auxiliary transmission fluid pump for proper function.

4. Can I continue driving my Toyota with OBDII code P2799 present?

It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission system. It is best to address the issue promptly.

5. How can I repair OBDII code P2799 in my Toyota?

Repair options may include replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the trouble code.

6. Is it possible to clear OBDII code P2799 in a Toyota without fixing the underlying issue?

While it is possible to clear the code using a diagnostic tool, it is important to address the root cause of the problem to prevent further transmission issues.

7. Can a DIY enthusiast fix OBDII code P2799 in a Toyota?

Depending on the level of expertise, a DIY enthusiast may be able to address the issue by following repair guides and utilizing the necessary tools. However, professional help is recommended for complex transmission repairs.

8. How much does it typically cost to repair OBDII code P2799 in a Toyota?

The cost of repair can vary depending on the cause of the issue, parts needed, and labor costs. It is advisable to consult a mechanic for an accurate estimate.

9. Are there any preventive maintenance steps to avoid OBDII code P2799 in a Toyota?

Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and conducting routine transmission inspections can help prevent issues leading to this trouble code.

10. How urgent is it to address OBDII code P2799 in a Toyota?

It is advisable to address the issue promptly to prevent further damage to the transmission system and ensure the safe operation of the vehicle.

Discuss the causes and fixes for P2799 Toyota OBDII Code

Submit a New Comment

Code P2799 Toyota comments

No comments found for this page.