AutoCodes – Generic – P1EC0

P1EC0 Code - Hybrid/EV Battery System Contactor Stuck Open

Quick Answer

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control 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: P1EC0 indicates Hybrid/EV Battery System Contactor Stuck Open.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control 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 2,446

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 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1EC0 Description

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

OBDII Code P1EC0 - Hybrid/EV Battery System Contactor Stuck Open - AutoCodes.com — P1EC0 Code - Hybrid/EV Battery System Contactor Stuck Open

What does this mean?

What are the Possible Causes of the DTC P1EC0?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P1EC0?

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 P1EC0 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.

Need more information about the P1EC0 code?

Need more information on how to fix the P1EC0 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EC0 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1EC0 Buick — Hybrid/EV Battery System Contactor Stuck Open
P1EC0 Cadillac — Hybrid/EV Battery System Contactor Stuck Open
P1EC0 Chevrolet — Hybrid/EV Battery System Contactor Stuck Open
P1EC0 GMC — Hybrid/EV Battery System Contactor Stuck Open
P1EC0 Saturn — Hybrid/EV Battery System Contactor Stuck Open

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 P1EC0 Code

1. What are the common symptoms of OBDII code P1EC0 (Hybrid/EV Battery System Contactor Stuck Open)?

- Common symptoms include difficulty starting the vehicle, reduced power, warning lights on the dashboard, and potential battery charging issues.

2. What are some possible causes of OBDII code P1EC0?

- Possible causes include a faulty contactor, damaged wiring or connectors, a weak or failing battery, or issues with the battery management system.

3. How serious is the OBDII code P1EC0?

- This code should be addressed promptly as it can lead to issues with the hybrid or electric vehicle's battery system, affecting performance and potentially causing further damage.

4. Can I still drive my vehicle with OBDII code P1EC0 present?

- It is not recommended to drive the vehicle with this code present, as it may lead to further damage to the battery system and could potentially leave you stranded.

5. How can I diagnose OBDII code P1EC0?

- Diagnosis typically involves using a scan tool to read the code, followed by inspecting the battery system components, wiring, and connectors for any visible damage or issues.

6. What are some repair tips for fixing OBDII code P1EC0?

- Repair tips include checking and replacing the faulty contactor, inspecting and repairing any damaged wiring or connectors, and ensuring the battery is in good condition.

7. Can I reset OBDII code P1EC0 and see if it comes back?

- While you can clear the code temporarily, it is crucial to address the underlying issue causing the code to prevent further problems with the battery system.

8. How much does it typically cost to repair OBDII code P1EC0?

- Repair costs can vary depending on the exact cause of the code, but it may involve replacing the contactor, repairing wiring, or addressing other battery system issues.

9. Are there any preventive measures to avoid OBDII code P1EC0 in the future?

- Regular maintenance of the hybrid or electric vehicle's battery system, including checking connectors and wiring, can help prevent issues that may trigger this code.

10. Should I attempt to fix OBDII code P1EC0 myself, or should I seek professional help?

- Due to the complexity of the hybrid or electric vehicle's battery system, it is recommended to seek professional help to diagnose and repair OBDII code P1EC0 correctly.