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

Quick Answer

The P1E27 diagnostic trouble code for Cadillac vehicles indicates an issue with the Auxiliary Transmission Fluid Pump Control Module in the Hybrid/EV Battery System, specifically relating to high voltage levels. Common causes include Faulty Auxiliary Transmission Fluid Pump Control Module, High voltage in the Hybrid/EV Battery System, Wiring or connection issues in the control module circuit. 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 Cadillac 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, High voltage in the Hybrid/EV Battery System, Wiring or connection issues in the control module circuit.
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 29, 2024
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Code P1E27 Cadillac Description

The P1E27 diagnostic trouble code for Cadillac vehicles indicates an issue with the Auxiliary Transmission Fluid Pump Control Module in the Hybrid/EV Battery System, specifically relating to high voltage levels. This code typically points to a problem with the control module that manages the operation of the auxiliary transmission fluid pump in hybrid or electric vehicles. The control module is responsible for regulating the voltage supplied to the pump, ensuring proper operation and efficiency.

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

Common Causes of P1E27 Cadillac

  1. Faulty Auxiliary Transmission Fluid Pump Control Module.
  2. High voltage in the Hybrid/EV Battery System.
  3. Wiring or connection issues in the control module circuit.
  4. Malfunctioning transmission fluid pump.
  5. Software glitches or programming errors in the control module.

Symptoms of P1E27 Cadillac

  1. Illumination of the check engine light on the dashboard.
  2. Transmission slipping or delayed shifting.
  3. Reduced fuel efficiency.
  4. Unusual noises coming from the transmission system.
  5. Inability to switch between hybrid and electric modes smoothly.

How to Fix P1E27 Cadillac

  1. Begin by conducting a thorough diagnostic scan to confirm the P1E27 code and pinpoint the exact cause of the issue.
  2. Inspect the Auxiliary Transmission Fluid Pump Control Module and associated wiring for any visible damage or loose connections.
  3. Test the voltage levels in the Hybrid/EV Battery System to determine if they are within the normal range.
  4. Replace the faulty control module if necessary and reprogram it to ensure proper functionality.
  5. Clear the trouble code from the vehicle's computer system and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1E27 Cadillac

The typical repair costs for addressing the P1E27 code in a Cadillac vehicle can range from $200 to $500, depending on the extent of the damage and the specific components that need to be replaced. This estimate includes the cost of the new Auxiliary Transmission Fluid Pump Control Module, any additional parts required, and labor charges. It is important to note that the actual repair costs may vary based on the location of the repair shop, the vehicle's make and model, and the technician's hourly labor rates. It is advisable to consult with a professional mechanic for a more accurate cost estimate tailored to your specific situation.

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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 P1E27 Cadillac Code

1. What does the OBDII code P1E27 mean on a Cadillac?

P1E27 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically related to Hybrid/EV battery system voltage being too high.

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

Symptoms may include a check engine light, transmission performance issues, reduced fuel efficiency, or the vehicle entering limp mode.

3. What causes the P1E27 code on a Cadillac?

Common causes include a faulty auxiliary transmission fluid pump, damaged wiring or connectors, a malfunctioning control module, or issues with the hybrid/EV battery system.

4. Can I drive my Cadillac with the P1E27 code?

Driving with this code is not recommended, as it can lead to potential transmission damage or further issues with the battery system.

5. How is the P1E27 code diagnosed?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the auxiliary transmission fluid pump, checking wiring and connections, and testing the control module and battery system voltage.

6. How do you fix the P1E27 code?

Repairs may include replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring, reprogramming or replacing the control module, or addressing hybrid/EV battery voltage issues.

7. Is the P1E27 code specific to Cadillac hybrid vehicles?

Yes, this code typically appears on Cadillac hybrid or EV models equipped with an auxiliary transmission fluid pump and a high-voltage battery system.

8. What tools are needed to troubleshoot the P1E27 code?

You’ll need an OBDII scanner, a multimeter for voltage testing, and manufacturer-specific diagnostic tools for hybrid/EV systems.

9. How much does it cost to fix the P1E27 code on a Cadillac?

Repair costs vary but can range from $200 to $1,500, depending on whether the issue is with the pump, wiring, or control module.

10. Can a dead hybrid/EV battery cause the P1E27 code?

A failing or improperly functioning hybrid/EV battery can contribute to this code, especially if it causes abnormal voltage levels.

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