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P2798 Lexus Code - Auxiliary Transmission Fluid Pump Control Circuit Low

Quick Answer

The P2798 diagnostic trouble code (DTC) for Lexus vehicles refers to the Auxiliary Transmission Fluid Pump Control Circuit Low. Common causes include Faulty auxiliary transmission fluid pump, Wiring issues or short circuits in the control circuit, Malfunctioning transmission control module (TCM). 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
P2798 Lexus indicates Auxiliary Transmission Fluid Pump Control Circuit Low.
Common causes
Common causes include Faulty auxiliary transmission fluid pump, Wiring issues or short circuits in the control circuit, Malfunctioning transmission control module (TCM).
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 09, 2024
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Code P2798 Lexus Description

The P2798 diagnostic trouble code (DTC) for Lexus vehicles refers to the Auxiliary Transmission Fluid Pump Control Circuit Low. This code indicates that there is an issue with the control circuit for the auxiliary transmission fluid pump, which is responsible for maintaining proper fluid pressure in the transmission system. The auxiliary pump assists the main transmission pump in circulating fluid throughout the transmission to ensure smooth gear shifting and overall performance.

OBDII Code P2798 Lexus - Auxiliary Transmission Fluid Pump Control Circuit Low
P2798 Lexus Code - Auxiliary Transmission Fluid Pump Control Circuit Low

Common Causes of P2798 Lexus

  1. Faulty auxiliary transmission fluid pump
  2. Wiring issues or short circuits in the control circuit
  3. Malfunctioning transmission control module (TCM)
  4. Low transmission fluid levels or contaminated fluid
  5. Electrical issues such as blown fuses or relays

Symptoms of P2798 Lexus

  1. Harsh or delayed shifting
  2. Slipping gears
  3. Transmission overheating
  4. Illuminated check engine light
  5. Reduced fuel efficiency

How to Fix P2798 Lexus

  1. Diagnose the code with a scan tool to confirm the issue and pinpoint the exact cause.
  2. Inspect the wiring and connectors in the auxiliary transmission fluid pump control circuit for any damage or corrosion.
  3. Test the auxiliary transmission fluid pump for proper operation and replace if necessary.
  4. Check the transmission fluid level and quality, topping up or flushing the system if needed.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2798 Lexus

The cost of repairing a P2798 code can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. This estimate includes the cost of a new auxiliary transmission fluid pump, wiring repairs, and diagnostic fees. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so it's advisable to get quotes from multiple shops to find the best deal.

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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 P2798 Lexus Code

1. What are the common symptoms of OBDII code P2798 in a Lexus related to the Auxiliary Transmission Fluid Pump Control Circuit?

The common symptoms include difficulty shifting gears, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P2798 in a Lexus?

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

3. How can I diagnose the issue related to OBDII code P2798 in my Lexus?

Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the wiring and connectors, checking the transmission fluid level, and testing the auxiliary transmission fluid pump.

4. Can I continue driving my Lexus with OBDII code P2798?

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

5. How can I repair OBDII code P2798 in my Lexus?

Repair options may include replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, or reprogramming the transmission control module.

6. Will resetting the check engine light resolve OBDII code P2798 in my Lexus?

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the fault code to appear. It's important to diagnose and repair the problem to prevent further complications.

7. Is it possible to prevent OBDII code P2798 from occurring in my Lexus?

Regular maintenance of the transmission system, including checking and maintaining proper fluid levels, can help prevent issues that may trigger this fault code. Keeping an eye on transmission performance can also aid in early detection of problems.

8. Can a DIY enthusiast fix OBDII code P2798 in a Lexus?

While some minor repairs like checking and topping up transmission fluid can be done by DIY enthusiasts, diagnosing and repairing complex issues related to this fault code may require professional expertise and specialized tools.

9. How much does it typically cost to repair OBDII code P2798 in a Lexus?

The cost of repairs can vary depending on the specific cause of the fault code and the labor rates in your area. It's recommended to get a diagnostic assessment from a qualified mechanic to determine the exact cost.

10. How long does it take to fix OBDII code P2798 in a Lexus?

The repair time can vary based on the complexity of the issue and the availability of parts. Simple fixes like replacing a connector may take a short time, while more involved repairs like replacing the auxiliary transmission fluid pump can take longer.

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