AutoCodes – Buick – P1E09 Buick

P1E09 Buick Code - Hybrid Battery Contactor Status Circuit High Voltage

Quick Answer

The hybrid powertrain control module monitors the hybrid/EV battery high voltage contactor status and requests contactor function primarily via serial data. Common causes include Faulty Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter Module circuit poor electrical connection. 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: P1E09 Buick indicates Hybrid Battery Contactor Status Circuit High Voltage.
Common causes: Common causes include Faulty Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter Module circuit poor electrical connection.
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 908

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E09 Buick Description

The hybrid powertrain control module monitors the hybrid/EV battery high voltage contactor status and requests contactor function primarily via serial data. In the event of a serial data fault there is a redundant discreet circuit between the two controllers that transmits the hybrid powertrain control module contactor requests to the hybrid powertrain control module 2 via a pulse width modulated (PWM) signal. The hybrid powertrain control module is internal to the power inverter module, often referred to as the drive motor generator power inverter module, and is not serviced separately.

OBDII Code P1E09 Buick - Hybrid Battery Contactor Status Circuit High Voltage - AutoCodes.com — P1E09 Buick Code - Hybrid Battery Contactor Status Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E09 Buick?

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

How to Fix the DTC P1E09 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 P1E09 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 P1E09 Buick Code

1. What does the OBDII code P1E09 mean on a Buick?

P1E09 indicates a "Hybrid Battery Contactor Status Circuit High Voltage" issue, meaning the vehicle's hybrid battery system has detected an abnormal voltage in the contactor circuit.

2. What are the common symptoms of the P1E09 code in a Buick?

Symptoms may include a check engine light, reduced hybrid system performance, inability to start the vehicle, or a warning about the hybrid system on the dashboard.

3. What causes the P1E09 code to appear in a Buick?

Common causes include a faulty hybrid battery contactor, damaged wiring or connectors in the contactor circuit, a malfunctioning battery control module, or internal faults in the hybrid battery.

4. Can I drive my Buick with the P1E09 code active?

Driving with this code is not recommended as it may lead to further damage to the hybrid system or cause the vehicle to lose power unexpectedly.

5. How is the P1E09 code diagnosed in a Buick?

A technician will use a scan tool to read the code and check for additional codes, visually inspect the wiring and connectors, and test the hybrid battery contactor and related components for proper operation.

6. What repairs are typically required to fix the P1E09 code?

Repairs may include replacing a faulty hybrid battery contactor, repairing or replacing damaged wiring, addressing issues with the battery control module, or servicing the hybrid battery itself.

7. How much does it cost to fix the P1E09 code on a Buick?

The repair cost varies depending on the exact issue but can range from $200 for wiring repairs to over $1,000 for hybrid battery-related components.

8. Can a low 12-volt battery cause the P1E09 code in a Buick?

While unlikely, a weak 12-volt battery can sometimes affect system diagnostics and should be checked to rule out any related issues.

9. How can I prevent the P1E09 code from occurring again?

Regularly inspect and maintain the hybrid electrical system, ensure connectors are secure, and address any warning signs or unusual behavior in the hybrid system promptly.

10. Does the P1E09 code require reprogramming of the hybrid system?

In some cases, after repairs, the vehicle's control modules may need to be reprogrammed or updated to reset the system and clear the code.