AutoCodes – Generic – P172A

P172A Code - Auxiliary Transmission Fluid Pump Reverse Rotation

Quick Answer

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump. Common causes include Faulty Auxiliary Transmission Fluid Pump, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump circuit poor electrical connection. 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, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump circuit poor electrical connection.
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.

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Code Popularity 6,080

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P172A Description

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump. The ECM sets the OBDII code when the Auxiliary Transmission Fluid Pump is not to factory specifications.

OBDII Code P172A - Auxiliary Transmission Fluid Pump Reverse Rotation - AutoCodes.com — P172A Code - Auxiliary Transmission Fluid Pump Reverse Rotation

What does this mean?

What are the Possible Causes of the DTC P172A?

Faulty Auxiliary Transmission Fluid Pump
Auxiliary Transmission Fluid Pump harness is open or shorted
Auxiliary Transmission Fluid Pump circuit poor electrical connection

How to Fix the DTC P172A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P172A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P172A code?

Need more information on how to fix the P172A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P172A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P172A Subaru — Auxiliary Transmission Fluid Pump Reverse Rotation

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.