AutoCodes – GMC – P1EC6 GMC

P1EC6 GMC Code - Hybrid/EV Battery Pack Heater Performance

Quick Answer

The hybrid/EV battery contains 5 high-voltage contactors and 2 transistors. Common causes include Faulty Hybrid/EV Battery Pack, Hybrid/EV Battery Pack harness is open or shorted, Hybrid/EV Battery Pack 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: P1EC6 GMC indicates Hybrid/EV Battery Pack Heater Performance.
Common causes: Common causes include Faulty Hybrid/EV Battery Pack, Hybrid/EV Battery Pack harness is open or shorted, Hybrid/EV Battery Pack 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 877

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 P1EC6 GMC Description

The hybrid/EV battery contains 5 high-voltage contactors and 2 transistors. The high-voltage contactors 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 are 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 are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are 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. Earth is provided through the case earth.
The hybrid/EV battery pack coolant heater is mounted to the coolant inlet on the back side of the hybrid/EV battery contactor assembly. The hybrid/EV battery pack coolant heater uses a 360 V power source.
After the ignition is turned ON, the hybrid/EV battery pack coolant heater is commanded ON. The hybrid/EV powertrain control module 2 monitors the temperature change at the hybrid/EV battery pack coolant temperature sensor 1 to determine if the hybrid/EV battery pack coolant heater is functioning properly.

OBDII Code P1EC6 GMC - Hybrid/EV Battery Pack Heater Performance - AutoCodes.com — P1EC6 GMC Code - Hybrid/EV Battery Pack Heater Performance

What does this mean?

What are the Possible Causes of the DTC P1EC6 GMC?

Faulty Hybrid/EV Battery Pack
Hybrid/EV Battery Pack harness is open or shorted
Hybrid/EV Battery Pack circuit poor electrical connection

How to Fix the DTC P1EC6 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 P1EC6 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 P1EC6 GMC Code

1. What are the common symptoms of OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- The common symptoms include reduced fuel efficiency, poor battery performance, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- The possible causes may include a malfunctioning battery pack heater, faulty sensors, wiring issues, or a problem with the battery management system.

3. How can I diagnose the issue related to OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- Diagnosis can be done using a diagnostic scanner to read the code, checking the battery pack heater, inspecting related wiring and sensors, and performing a system test.

4. Can I continue driving my vehicle with OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- It is not recommended to continue driving the vehicle with this code as it can lead to further damage to the hybrid or electric system.

5. How can I repair OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- Repair options may include replacing the battery pack heater, fixing wiring issues, replacing faulty sensors, or reprogramming the battery management system.

6. Is it possible to reset OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance) without repairs?

- While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue to prevent further problems.

7. Are there any DIY tips for resolving OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- DIY tips may include checking for loose connections, inspecting the battery heater for visible damage, and ensuring proper insulation around the battery pack.

8. How much does it typically cost to repair OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance)?

- The cost of repair can vary depending on the cause of the issue, but it may range from a few hundred to a couple of thousand dollars, including parts and labor.

9. What should I do if OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance) keeps recurring after repairs?

- If the code keeps coming back after repairs, it is advisable to have a professional technician perform a thorough diagnostic to identify any underlying issues.

10. Can OBDII code P1EC6 GMC (Hybrid/EV Battery Pack Heater Performance) affect the overall performance of my vehicle?

- Yes, this code can impact the overall performance of the vehicle, especially in terms of fuel efficiency and battery operation in hybrid or electric vehicles.