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P1E1E Cadillac Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage

Quick Answer

The P1E1E diagnostic trouble code (DTC) is specific to Cadillac vehicles equipped with hybrid powertrains. Common causes include Faulty Hybrid Battery Voltage Isolation Sensor, Damaged or corroded wiring in the sensor circuit, Poor electrical connections or loose connectors in the 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
P1E1E Cadillac indicates Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage.
Common causes
Common causes include Faulty Hybrid Battery Voltage Isolation Sensor, Damaged or corroded wiring in the sensor circuit, Poor electrical connections or loose connectors in the 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 Oct 21, 2024
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Code P1E1E Cadillac Description

The P1E1E diagnostic trouble code (DTC) is specific to Cadillac vehicles equipped with hybrid powertrains. This code indicates that the Auxiliary Transmission Fluid Pump Control Module has detected a low voltage condition in the Hybrid Battery Voltage Isolation Sensor Circuit 2. The hybrid battery system is critical for the operation of hybrid vehicles, as it provides the necessary power to drive the electric motors and assist the internal combustion engine.

OBDII Code P1E1E Cadillac - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage
P1E1E Cadillac Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage

Common Causes of P1E1E Cadillac

  1. Faulty Hybrid Battery Voltage Isolation Sensor.
  2. Damaged or corroded wiring in the sensor circuit.
  3. Poor electrical connections or loose connectors in the circuit.
  4. Malfunctioning Auxiliary Transmission Fluid Pump Control Module.
  5. Issues with the hybrid battery pack itself, such as cell failure or degradation.

Symptoms of P1E1E Cadillac

  1. Warning lights on the dashboard, specifically the hybrid system warning light.
  2. Reduced power output or sluggish acceleration when attempting to drive.
  3. Unusual noises from the transmission or hybrid system during operation.
  4. The vehicle may enter a fail-safe mode, restricting its performance.
  5. Increased fuel consumption due to inefficient hybrid system operation.

How to Fix P1E1E Cadillac

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P1E1E code and check for any additional codes that may provide insight into the issue.
  2. Visual Inspection: Inspect the wiring harness and connectors associated with the Hybrid Battery Voltage Isolation Sensor for signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If the isolation sensor is found to be faulty, replace it with a new, OEM-quality part to ensure proper functionality.
  4. Wiring Repair: If damaged wiring is identified, repair or replace the affected sections to restore proper electrical flow.
  5. Module Testing: If the issue persists, test the Auxiliary Transmission Fluid Pump Control Module for functionality, and replace it if necessary.

Cost to Fix P1E1E Cadillac

The typical repair costs for addressing the P1E1E code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $300 and $1,200. This estimate includes parts such as the isolation sensor, wiring components, and potentially the control module, along with labor costs. Labor rates can vary significantly; most auto repair shops charge between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer lower rates. It's advisable to check local rates for a more precise estimate based on your location and the specific make and model of your vehicle.

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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 P1E1E Cadillac Code

1. What does the OBDII code P1E1E mean on a Cadillac?

The code P1E1E indicates an issue with the Hybrid Battery Voltage Isolation Sensor Circuit 2, specifically that it is detecting low voltage, which affects the Auxiliary Transmission Fluid Pump Control Module.

2. What are the common symptoms of the P1E1E code?

Symptoms may include the check engine light turning on, reduced hybrid system performance, transmission shifting issues, or the vehicle entering limp mode.

3. What causes the P1E1E code to appear?

Common causes include a faulty hybrid battery voltage isolation sensor, wiring or connection issues in the circuit, a defective auxiliary transmission fluid pump control module, or hybrid battery problems.

4. Can I drive my Cadillac with a P1E1E code?

It's not recommended to drive the vehicle with this code, as it may lead to further damage to the hybrid system or transmission and compromise performance.

5. How is the P1E1E code diagnosed?

A technician will use a scan tool to read the code and examine the circuit, checking the sensor, wiring, and control module for faults or low voltage issues.

6. What repairs can fix the P1E1E code?

Repairs may include replacing the faulty hybrid battery voltage isolation sensor, repairing or replacing damaged wiring, or replacing the auxiliary transmission fluid pump control module.

7. How much does it cost to fix the P1E1E code?

Repair costs can vary depending on the exact issue, but sensor replacement may range from $200 to $600, while control module replacement could cost $500 or more.

8. What happens if the P1E1E issue is ignored?

Ignoring this issue can lead to further damage to the hybrid system, transmission problems, decreased fuel efficiency, and potential safety risks.

9. Can a dead hybrid battery cause the P1E1E code?

Yes, a failing or improperly isolated hybrid battery can cause voltage issues that trigger this code.

10. Do I need to reprogram the control module after repairs for the P1E1E code?

In some cases, the auxiliary transmission fluid pump control module or related systems may need reprogramming or calibration after repairs to ensure proper functionality.

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