AutoCodes – Buick – P1E20 Buick

P1E20 Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low 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: P1E20 Buick indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low 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 872

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 P1E20 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 P1E20 Buick - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage - AutoCodes.com — P1E20 Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1E20 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 P1E20 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 P1E20 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 P1E20 Buick Code

1. What does the OBDII code P1E20 mean on a Buick?

P1E20 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically a low voltage condition in the Hybrid/EV battery voltage sense circuit.

2. What are common symptoms of the P1E20 code?

Symptoms may include warning lights on the dashboard, reduced hybrid or EV performance, transmission shifting irregularities, or lack of power to the auxiliary transmission fluid pump.

3. What causes the P1E20 code to appear?

Common causes include a faulty battery voltage sensor, damaged wiring or connectors in the voltage sense circuit, or a malfunctioning Auxiliary Transmission Fluid Pump Control Module.

4. Can driving with the P1E20 code damage my vehicle?

Driving with this code may impair hybrid or EV functionality and could potentially lead to transmission overheating or performance issues. Itâ€™s best to address it promptly.

5. How is the P1E20 code diagnosed?

Technicians typically use an advanced scan tool to monitor real-time data, inspect the voltage sense circuit wiring, and test the Auxiliary Transmission Fluid Pump Control Module for proper operation.

6. What repairs are needed to fix the P1E20 code?

Repairs may include replacing the battery voltage sense circuit sensor, repairing damaged wiring or connectors, or replacing the Auxiliary Transmission Fluid Pump Control Module.

7. Can a weak hybrid/EV battery cause the P1E20 code?

Yes, a weak or failing hybrid/EV battery can sometimes contribute to voltage irregularities that trigger this code.

8. How much does it cost to fix the P1E20 code on a Buick?

Repair costs depend on the specific issue, but diagnosing and repairing wiring or sensor issues typically ranges from $200 to $600, while module replacements may be more expensive.

9. Will clearing the P1E20 code solve the problem?

Clearing the code may temporarily remove the warning, but it wonâ€™t fix the underlying issue. Proper diagnosis and repair are needed to prevent the code from returning.

10. Can I fix the P1E20 code myself?

If you have experience with automotive electrical systems, you may be able to inspect wiring and connectors. However, module replacements and advanced diagnostics are best left to professionals.