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Engine-Codes – Generic – P172A

P172A Code - Auxiliary Transmission Fluid Pump Reverse Rotation

Quick Answer

The P172A code indicates an issue with the auxiliary transmission fluid pump experiencing reverse rotation. Common causes include Faulty auxiliary transmission fluid pump, Electrical issues in the transmission pump circuit, Low transmission fluid levels or poor quality fluid. 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
P172A indicates Auxiliary Transmission Fluid Pump Reverse Rotation.
Common causes
Common causes include Faulty auxiliary transmission fluid pump, Electrical issues in the transmission pump circuit, Low transmission fluid levels or poor quality fluid.
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
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Code P172A Description

The P172A code indicates an issue with the auxiliary transmission fluid pump experiencing reverse rotation. The auxiliary transmission fluid pump is responsible for assisting in the circulation of transmission fluid, which is crucial for proper lubrication and cooling of the transmission components. When the pump experiences reverse rotation, it can disrupt the proper flow of transmission fluid, leading to potential overheating, increased wear on transmission components, and ultimately affecting the vehicle's performance and reliability.

OBDII Code P172A - Auxiliary Transmission Fluid Pump Reverse Rotation
P172A Code - Auxiliary Transmission Fluid Pump Reverse Rotation

Common Causes of P172A

  1. Faulty auxiliary transmission fluid pump
  2. Electrical issues in the transmission pump circuit
  3. Low transmission fluid levels or poor quality fluid
  4. Mechanical failure within the transmission pump
  5. Software or calibration issues within the transmission control module

Symptoms of P172A

  1. Transmission slipping or delayed engagement
  2. Harsh shifting or erratic transmission behavior
  3. Transmission overheating
  4. Illumination of the Check Engine Light
  5. Decreased fuel efficiency

How to Fix P172A

  1. Diagnose the issue by using a scan tool to confirm the P172A code and inspecting the auxiliary transmission fluid pump.
  2. Check the transmission fluid level and quality, topping off or replacing as necessary.
  3. Test the transmission pump circuit for any electrical faults or wiring issues.
  4. Replace the auxiliary transmission fluid pump if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the fault code and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P172A

The cost of repairing the auxiliary transmission fluid pump reverse rotation issue can vary depending on the extent of the damage, the need for parts replacement, and labor costs. On average, the repair for this issue can range from $200 to $500, including parts and labor. It's essential to consider the specific diagnosis time and labor rates at auto repair shops in your area, as they can impact the overall cost of the repair.

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Code P172A Information for Specific Makes

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 P172A Code

1. What are the common symptoms of OBDII code P172A (Auxiliary Transmission Fluid Pump Reverse Rotation)?

The common symptoms include erratic shifting, transmission slipping, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code P172A to trigger?

The code P172A is typically triggered by issues such as a faulty auxiliary transmission fluid pump, damaged wiring, or a malfunctioning transmission control module.

3. How serious is the OBDII code P172A (Auxiliary Transmission Fluid Pump Reverse Rotation)?

Ignoring the code P172A can lead to further damage to the transmission system, potential transmission failure, and unsafe driving conditions. It is important to address this issue promptly.

4. Can driving with the OBDII code P172A cause further damage to the vehicle?

Continuing to drive with the code P172A may cause additional stress on the transmission components, resulting in more severe damage and potentially higher repair costs.

5. How can I diagnose the cause of the OBDII code P172A?

Diagnosing the code P172A typically involves performing a thorough inspection of the auxiliary transmission fluid pump, checking the wiring for any damage, and using a scan tool to retrieve additional information from the vehicle's computer.

6. What are some repair tips for fixing the OBDII code P172A?

Repairing the code P172A may involve replacing the faulty auxiliary transmission fluid pump, repairing any damaged wiring, or reprogramming the transmission control module as necessary.

7. Can I reset the OBDII code P172A without fixing the underlying issue?

Resetting the code without addressing the underlying problem will only temporarily clear the warning light, and the issue is likely to resurface. It is important to diagnose and repair the root cause of the code.

8. Is it safe to drive my vehicle with the OBDII code P172A?

It is not recommended to drive the vehicle with the code P172A present, as it can lead to transmission issues and potentially unsafe driving conditions. It is best to address the problem promptly.

9. How much does it typically cost to repair the OBDII code P172A?

The cost of repairing the code P172A can vary depending on the exact cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from different mechanics.

10. Can the OBDII code P172A be a recurring issue?

If the root cause of the code P172A is not properly addressed, it can become a recurring issue. To prevent this, ensure that the necessary repairs are carried out correctly.

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