AutoCodes – GMC – P1EC0 GMC

P1EC0 GMC 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 GMC 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 827

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

What does this mean?

What are the Possible Causes of the DTC P1EC0 GMC?

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 GMC?

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 GMC 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 P1EC0 GMC Code

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

The common symptoms include the hybrid or electric vehicle not starting, reduced power or acceleration, warning lights on the dashboard, and poor fuel economy.

2. What can cause the OBDII code P1EC0 GMC to trigger (Hybrid/EV Battery System Contactor Stuck Open)?

The code can be triggered by a faulty contactor in the hybrid/EV battery system, wiring issues, or a malfunction in the control module.

3. How serious is the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

This code is considered serious as it can affect the performance and drivability of the vehicle. It is important to address the issue promptly to prevent further damage.

4. How can I diagnose the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the hybrid/EV battery system components, and testing the contactors for proper functionality.

5. Can I still drive my vehicle with the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the hybrid/EV system. It's best to have the issue addressed by a qualified technician.

6. How can I repair the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

Repair options may include replacing the faulty contactor, repairing any wiring issues, or reprogramming the control module. It is advised to seek professional help for accurate diagnosis and repair.

7. Are there any DIY tips for fixing the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

While basic troubleshooting like checking for loose connections or damaged wiring can be done, complex repairs involving the hybrid/EV system should be left to experienced professionals.

8. How much does it cost to repair the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

The cost of repair can vary depending on the extent of the issue, parts needed, and labor rates. It is advisable to obtain quotes from different repair shops for an accurate estimate.

9. Will resetting the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open) make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and fix the root cause of the problem.

10. How long can I safely wait before addressing the OBDII code P1EC0 GMC (Hybrid/EV Battery System Contactor Stuck Open)?

It is recommended to address the issue as soon as possible to prevent further damage to the hybrid/EV system and ensure the vehicle's optimal performance and safety.