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Engine-Codes – Subaru – P1722 Subaru

P1722 Subaru Code - Automatic Transmission Diagnosis Signal Voltage High

Quick Answer

The P1722 Subaru code indicates that there is a high voltage signal detected in the automatic transmission diagnosis system. Common causes include Faulty transmission control module, Corroded or damaged wiring/connectors in the transmission system, Low transmission fluid levels or contaminated 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
P1722 Subaru indicates Automatic Transmission Diagnosis Signal Voltage High.
Common causes
Common causes include Faulty transmission control module, Corroded or damaged wiring/connectors in the transmission system, Low transmission fluid levels or contaminated 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 Aug 18, 2024
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Code P1722 Subaru Description

The P1722 Subaru code indicates that there is a high voltage signal detected in the automatic transmission diagnosis system. This could be caused by a malfunction in the transmission control module or issues with the wiring or connectors in the transmission system. The high voltage signal can disrupt the communication between the transmission control module and other components, leading to performance issues and potential long-term damage if not addressed promptly.

OBDII Code P1722 Subaru - Automatic Transmission Diagnosis Signal Voltage High
P1722 Subaru Code - Automatic Transmission Diagnosis Signal Voltage High

Common Causes of P1722 Subaru

  1. Faulty transmission control module
  2. Corroded or damaged wiring/connectors in the transmission system
  3. Low transmission fluid levels or contaminated fluid
  4. Malfunctioning transmission sensors
  5. Electrical issues in the vehicle's system

Symptoms of P1722 Subaru

  1. Harsh shifting or erratic shifting patterns
  2. Delayed engagement when shifting gears
  3. Transmission slipping
  4. Reduced fuel efficiency
  5. Illumination of the check engine light

How to Fix P1722 Subaru

  1. Perform a diagnostic scan to confirm the P1722 code and identify the exact cause of the high voltage signal.
  2. Inspect the wiring and connectors in the transmission system for any damage or corrosion. Repair or replace as necessary.
  3. Check the transmission control module for faults and replace if needed.
  4. Verify the fluid level and quality in the transmission. Top up or replace the fluid if it is low or contaminated.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1722 Subaru

The cost of repairing a P1722 Subaru code can vary depending on the exact cause of the issue and the labor rates in your area. Generally, the repair could range from $200 to $600, including parts and labor. It's recommended to get quotes from different auto repair shops to find the best price for your specific situation. Keep in mind that additional costs may apply if other issues are discovered during the diagnostic process.

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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 P1722 Subaru Code

1. What are the common symptoms of OBDII code P1722 in a Subaru automatic transmission?

- Common symptoms may include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission going into limp mode.

2. What does the OBDII code P1722 Subaru indicate about the automatic transmission?

- The code P1722 signifies that there is a high voltage signal detected in the automatic transmission diagnosis circuit.

3. What are the possible causes of OBDII code P1722 in a Subaru?

- Possible causes include a faulty transmission control module (TCM), damaged wiring or connectors in the diagnosis circuit, or a malfunctioning shift solenoid.

4. How can I diagnose the issue causing OBDII code P1722 in my Subaru?

- Diagnosing the issue may involve checking the TCM for faults, inspecting wiring and connectors for damage, and testing the shift solenoid for proper operation.

5. Can driving with OBDII code P1722 in a Subaru cause further damage to the vehicle?

- Continuing to drive with code P1722 present can potentially cause damage to the transmission components and lead to more severe transmission issues over time.

6. How can I repair OBDII code P1722 in my Subaru automatic transmission?

- Repairing code P1722 may involve replacing a faulty TCM, repairing damaged wiring or connectors, or replacing a malfunctioning shift solenoid.

7. Is it safe to clear the OBDII code P1722 in my Subaru without addressing the underlying issue?

- Clearing the code without resolving the root cause may temporarily turn off the check engine light, but the underlying transmission issue will persist and may lead to further problems.

8. Can a DIY enthusiast fix OBDII code P1722 in a Subaru, or is it best left to a professional mechanic?

- While some basic diagnostic steps can be taken by a DIY enthusiast, repairing code P1722 often requires specialized tools and expertise, making it best suited for a professional mechanic.

9. Are there any preventive maintenance steps I can take to avoid encountering OBDII code P1722 in my Subaru?

- Regularly servicing the transmission, checking for any signs of fluid leaks, and addressing any shifting issues promptly can help prevent the occurrence of code P1722.

10. How long does it typically take to repair OBDII code P1722 in a Subaru automatic transmission?

- The repair time can vary depending on the exact cause of the code, but it may take several hours to a full day for a mechanic to diagnose and repair the issue successfully.

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