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Engine-Codes – Generic – P1E27

P1E27 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage

Quick Answer

The diagnostic trouble code P1E27 refers to an issue with the Auxiliary Transmission Fluid Pump Control Module in the hybrid/EV battery system, specifically indicating that the voltage is higher than normal. Common causes include Faulty Auxiliary Transmission Fluid Pump Control Module, Electrical issues such as a short circuit or wiring damage, High voltage spikes in the hybrid/EV battery 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
P1E27 indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage.
Common causes
Common causes include Faulty Auxiliary Transmission Fluid Pump Control Module, Electrical issues such as a short circuit or wiring damage, High voltage spikes in the hybrid/EV battery 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 11, 2024
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Code P1E27 Description

The diagnostic trouble code P1E27 refers to an issue with the Auxiliary Transmission Fluid Pump Control Module in the hybrid/EV battery system, specifically indicating that the voltage is higher than normal. This code is typically found in hybrid vehicles or electric vehicles and can signal a problem with the control module that manages the transmission fluid pump.

OBDII Code P1E27 - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
P1E27 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage

Common Causes of P1E27

  1. Faulty Auxiliary Transmission Fluid Pump Control Module.
  2. Electrical issues such as a short circuit or wiring damage.
  3. High voltage spikes in the hybrid/EV battery system.
  4. Malfunctioning transmission fluid pump.
  5. Software glitches in the control module programming.

Symptoms of P1E27

  1. Illumination of the check engine light on the dashboard.
  2. Decreased fuel efficiency.
  3. Rough or delayed shifting of the transmission.
  4. Unusual noises coming from the transmission system.
  5. Reduced overall performance of the vehicle, especially in hybrid mode.

How to Fix P1E27

  1. Diagnose the issue using a diagnostic scanner to confirm the P1E27 code and identify the root cause.
  2. Inspect the Auxiliary Transmission Fluid Pump Control Module and associated wiring for any visible damage or corrosion.
  3. Test the voltage levels in the hybrid/EV battery system to determine if there are any irregularities.
  4. Replace the faulty control module or transmission fluid pump if necessary.
  5. Clear the trouble code from the system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1E27

The cost of repairing the P1E27 code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair costs for this type of problem can range from $200 to $800, including parts and labor. However, it's important to note that prices can vary significantly based on the vehicle make and model, the location of the repair shop, and the expertise of the technicians. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your particular situation.

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Code P1E27 Information for Specific Makes

  • P1E27 Acura — Brake Fluid Pressure Sensor PU Circuit High Voltage
  • P1E27 Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
  • P1E27 Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
  • P1E27 Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
  • P1E27 GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
  • P1E27 Honda — Brake Fluid Pressure Sensor PU Circuit High Voltage
  • P1E27 Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage
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 P1E27 Code

1. What does the OBDII code P1E27 mean?

P1E27 indicates an issue where the Auxiliary Transmission Fluid Pump Control Module detects a high voltage in the Hybrid/EV battery system that exceeds the expected range.

2. What are the common symptoms of the P1E27 code?

Symptoms may include the Check Engine Light or Hybrid System Warning Light turning on, erratic transmission performance, reduced fuel efficiency, or limited vehicle performance in hybrid or EV modes.

3. What causes the P1E27 code to appear?

Common causes include a malfunctioning auxiliary transmission fluid pump, a faulty control module, damaged or corroded wiring, or an issue with the hybrid/EV battery pack.

4. Can the P1E27 code be triggered by low transmission fluid?

No, this code specifically relates to high voltage in the hybrid/EV battery system, not the fluid level. However, ensuring proper fluid levels is still critical for overall system performance.

5. How is the P1E27 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the auxiliary pump and related wiring, test the control module, and measure the voltage levels in the hybrid/EV battery system for abnormalities.

6. Can I drive my car with the P1E27 code?

It’s not recommended, as ignoring the code could lead to further damage to the transmission or hybrid/EV system and result in reduced vehicle performance or safety risks.

7. How do I fix the P1E27 code?

Repairs may include replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring, updating the control module software, or addressing issues with the hybrid/EV battery system.

8. Is the P1E27 code covered under warranty?

In many cases, hybrid/EV system components may be covered under extended warranties. Check with your manufacturer or dealer for specific warranty details.

9. How much does it cost to repair the P1E27 code?

Repair costs vary depending on the root cause, but they can range from $200 for wiring repairs to over $1,000 for replacing a control module or auxiliary pump.

10. Can a dead 12V battery cause the P1E27 code?

A dead or weak 12V battery is unlikely to directly cause the P1E27 code, but it can affect the vehicle’s electrical systems and should be checked as part of the diagnostic process.

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