AutoCodes – Chevrolet – P1EC5 Chevrolet

P1EC5 Chevrolet Code - Hybrid/EV Battery Pack Heater Transistor Stuck On

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: P1EC5 Chevrolet indicates Hybrid/EV Battery Pack Heater Transistor Stuck On.
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 1,067

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 P1EC5 Chevrolet 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 P1EC5 Chevrolet - Hybrid/EV Battery Pack Heater Transistor Stuck On - AutoCodes.com — P1EC5 Chevrolet Code - Hybrid/EV Battery Pack Heater Transistor Stuck On

What does this mean?

What are the Possible Causes of the DTC P1EC5 Chevrolet?

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 P1EC5 Chevrolet?

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 P1EC5 Chevrolet 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 P1EC5 Chevrolet Code

1. What are common symptoms of the P1EC5 code in a Chevrolet Hybrid/EV?

- Common symptoms include the battery pack heater staying on continuously, reduced battery performance, and potential overheating of the battery pack.

2. What causes the Hybrid/EV battery pack heater transistor to get stuck on in a Chevrolet?

- The most common cause is a malfunction in the heater control circuit, which could be due to a faulty heater transistor, wiring issues, or a defective temperature sensor.

3. How can I diagnose the P1EC5 code in my Chevrolet Hybrid/EV?

- Diagnosing the code usually involves checking the heater control circuit for any faults, testing the heater transistor, inspecting the wiring for damage, and verifying the temperature sensor's functionality.

4. Can I still drive my Chevrolet with the P1EC5 code present?

- It is not recommended to drive the vehicle with the P1EC5 code active, as it can lead to potential safety hazards and damage to the battery pack. It's best to have the issue addressed promptly.

5. What are the repair options for the P1EC5 code in a Chevrolet Hybrid/EV?

- Repair options may include replacing the faulty heater transistor, repairing any damaged wiring or connectors, resetting the fault codes, and ensuring proper functionality of the temperature sensor.

6. How serious is the P1EC5 code in a Chevrolet Hybrid/EV?

- The P1EC5 code should be taken seriously as it can affect the performance and safety of the battery pack in the vehicle. Ignoring the issue can lead to further damage and potentially costly repairs.

7. Can I reset the P1EC5 code in my Chevrolet Hybrid/EV myself?

- While you can attempt to clear the code using an OBDII scanner, it's important to address the underlying issue causing the code to prevent it from reoccurring. If the problem persists, seek professional assistance.

8. Is the P1EC5 code covered under Chevrolet's warranty for Hybrid/EV vehicles?

- Depending on the vehicle's warranty coverage, the repair for the P1EC5 code may be covered if the vehicle is still within the warranty period. Check with your Chevrolet dealership for specific details.

9. How can I prevent the P1EC5 code from appearing in my Chevrolet Hybrid/EV?

- Regular maintenance checks, ensuring proper battery pack heater function, and promptly addressing any warning signs can help prevent the P1EC5 code from occurring in your Chevrolet Hybrid/EV.

10. Are there any safety precautions I should take if I suspect the battery pack heater is malfunctioning in my Chevrolet Hybrid/EV?

- If you suspect a malfunction in the battery pack heater, it's advisable to avoid charging the vehicle, disconnect the battery, and seek professional assistance to prevent any potential safety hazards.