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Engine-Codes – Generic – P1E22

P1E22 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

Quick Answer

The diagnostic trouble code P1E22 indicates a fault with the Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation. Common causes include Faulty Isolation Component: A defective component within the isolation system can cause a loss of isolation between the battery and the transmission fluid pump control module, Wiring Issues: Loose or damaged wiring connections can disrupt the communication between the battery and the control module, triggering the code, Battery Voltage Fluctuations: Fluctuations in the battery's voltage levels can also lead to this issue, potentially caused by a failing battery or charging system. 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
P1E22 indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost.
Common causes
Common causes include Faulty Isolation Component: A defective component within the isolation system can cause a loss of isolation between the battery and the transmission fluid pump control module, Wiring Issues: Loose or damaged wiring connections can disrupt the communication between the battery and the control module, triggering the code, Battery Voltage Fluctuations: Fluctuations in the battery's voltage levels can also lead to this issue, potentially caused by a failing battery or charging system.
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 12, 2024
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Code P1E22 Description

The diagnostic trouble code P1E22 indicates a fault with the Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation. This system is crucial in hybrid and electric vehicles as it helps regulate the voltage levels of the battery, ensuring optimal performance and efficiency. When this code is triggered, it means that there is a loss of isolation between the hybrid or electric battery and the auxiliary transmission fluid pump control module. This can lead to various issues within the vehicle's systems, affecting performance and potentially causing long-term damage if not addressed promptly.

OBDII Code P1E22 - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
P1E22 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

Common Causes of P1E22

  1. Faulty Isolation Component: A defective component within the isolation system can cause a loss of isolation between the battery and the transmission fluid pump control module.
  2. Wiring Issues: Loose or damaged wiring connections can disrupt the communication between the battery and the control module, triggering the code.
  3. Battery Voltage Fluctuations: Fluctuations in the battery's voltage levels can also lead to this issue, potentially caused by a failing battery or charging system.
  4. Software Glitch: An issue with the vehicle's software or control module programming can cause miscommunication between the components, resulting in the code.

Symptoms of P1E22

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Transmission Issues: The vehicle may experience problems with shifting gears smoothly or may exhibit jerky or delayed gear changes.
  3. Reduced Power: The vehicle may lack power or acceleration, especially when driving at high speeds or going uphill.
  4. Battery Drain: The hybrid or electric battery may drain faster than usual, leading to decreased range or performance.

How to Fix P1E22

  1. Diagnostic Scan: Begin by performing a comprehensive diagnostic scan to confirm the P1E22 code and identify any other related fault codes.
  2. Check Wiring: Inspect the wiring connections between the battery and the transmission fluid pump control module for any signs of damage or looseness. Repair or replace as needed.
  3. Test Isolation Component: Test the isolation component to ensure it is functioning correctly. Replace if found to be faulty.
  4. Battery Voltage Check: Verify the battery's voltage levels to ensure they are within the manufacturer's specifications. Address any issues with the battery or charging system.
  5. Clear Codes: After completing the repairs, clear the diagnostic trouble codes and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1E22

The typical repair costs for addressing the P1E22 code can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair for this issue can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can be higher or lower based on factors such as the vehicle make and model, the technician's hourly labor rate, and any additional repairs that may be required. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate cost estimate tailored to your specific vehicle and situation. Keep in mind that diagnostic time and labor rates can vary significantly, so it's advisable to shop around and compare prices before committing to any repairs.

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Code P1E22 Information for Specific Makes

  • P1E22 Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
  • P1E22 Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
  • P1E22 Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
  • P1E22 GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
  • P1E22 Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost
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 P1E22 Code

1. What are the common symptoms of OBDII code P1E22?

- Common symptoms include reduced hybrid or electric vehicle performance, decreased fuel efficiency, and potential warning lights on the dashboard.

2. What could cause the OBDII code P1E22 to trigger?

- The code may be triggered due to a malfunction in the auxiliary transmission fluid pump control module or issues with the Hybrid/EV battery voltage system isolation.

3. How can I diagnose the issue related to code P1E22?

- Diagnosis typically involves using a professional OBDII scanner to read the code, inspecting the auxiliary transmission fluid pump control module, and checking the Hybrid/EV battery voltage system components.

4. What are the potential repair options for resolving code P1E22?

- Repair options may include replacing the faulty auxiliary transmission fluid pump control module, repairing any damaged wiring or connections in the Hybrid/EV battery voltage system, or resetting the system.

5. Can I continue driving with OBDII code P1E22 present?

- It is not recommended to ignore the code and continue driving, as it may lead to further damage to the vehicle's hybrid or electric components. It's best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P1E22?

- The cost of repair can vary depending on the extent of the issue and the specific components that need attention. It's advisable to consult a professional mechanic for an accurate estimate.

7. Are there any DIY tips for troubleshooting code P1E22?

- DIY tips may include checking the battery connections, ensuring proper fluid levels, and inspecting the wiring for any visible damage. However, complex issues may require professional assistance.

8. Is OBDII code P1E22 specific to hybrid or electric vehicles only?

- Yes, this code is specific to hybrid or electric vehicles due to its relation to the auxiliary transmission fluid pump control module and the Hybrid/EV battery voltage system.

9. Can a faulty battery be a potential cause of OBDII code P1E22?

- Yes, a faulty Hybrid/EV battery can potentially cause the system isolation to be lost, triggering the code P1E22. It's important to have the battery tested if this is suspected.

10. How urgent is it to address OBDII code P1E22?

- It is recommended to address the issue as soon as possible to prevent any further damage to the vehicle's hybrid or electric components and ensure optimal performance and safety.

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