AutoCodes – Buick – P1E27 Buick

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

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted. 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 Buick indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage.
Common causes: Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted.
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.

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Code Popularity 1,052

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E27 Buick Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. Each drive motor control module monitors its internal high voltage sensor for correct operation, no external circuits are involved. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.

OBDII Code P1E27 Buick - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage - AutoCodes.com — P1E27 Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E27 Buick?

Program Power Inverter Module
Faulty Power Inverter Module
Power Inverter Module harness is open or shorted
Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1E27 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1E27 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Buick Code

1. What does the OBDII code P1E27 mean for a Buick?

The P1E27 code indicates an issue with the Auxiliary Transmission Fluid Pump Control Module detecting abnormally high voltage in the hybrid/EV battery system.

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

Symptoms may include an illuminated check engine light, reduced hybrid/EV performance, overheating transmission, or difficulty shifting.

3. What causes the P1E27 code to appear?

Common causes include faulty wiring, a malfunctioning Auxiliary Transmission Fluid Pump Control Module, a failing hybrid/EV battery, or issues with the transmission fluid pump.

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

Driving with the P1E27 code is not recommended, as it may cause further damage to the hybrid/EV battery or transmission system.

5. How is the P1E27 code diagnosed?

A technician will use a scan tool to confirm the code, inspect wiring and connections, test the Auxiliary Transmission Fluid Pump Control Module, and check the hybrid/EV battery system.

6. What repairs can fix the P1E27 code?

Repairs may include replacing damaged wiring, repairing or replacing the Auxiliary Transmission Fluid Pump Control Module, or addressing issues with the hybrid/EV battery system.

7. How much does it cost to fix the P1E27 code on a Buick?

Repair costs vary depending on the root cause but typically range from $200 to $1,500, with higher costs for hybrid/EV battery repairs.

8. Can low transmission fluid cause the P1E27 code?

Low transmission fluid alone is unlikely to cause this code but could lead to related issues that contribute to transmission overheating.

9. Is the P1E27 code specific to Buick hybrid/EV models?

Yes, the P1E27 code is generally found in Buick hybrid and EV models with advanced transmission and battery systems.

10. How can I prevent the P1E27 code from occurring?

Regular maintenance, including checking transmission fluid levels, inspecting wiring, and ensuring the battery management system is functioning properly, can help prevent this issue.