AutoCodes – Buick – P1EAC Buick

P1EAC Buick Code - Hybrid/EV Battery Cell Overvoltage Signal Circuit Performance

Quick Answer

The 2nd protection is a redundant method to monitor cell group overvoltage. Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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: P1EAC Buick indicates Hybrid/EV Battery Cell Overvoltage Signal Circuit Performance.
Common causes: Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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 1,712

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1EAC Buick Description

The 2nd protection is a redundant method to monitor cell group overvoltage. The four hybrid/EV battery interface control modules independently read and test each cell group. The 2nd protection circuit fault is the actual hardwire signal from the four hybrid/EV battery interface control modules to the hybrid/EV battery energy control module and terminating in the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 diagnoses this line to determine when a cell group overvoltage condition exists.
The 2nd protection self test diagnostic is used to check the signal circuit. The hybrid/EV battery energy control module performs this test, once, every power down cycle. When run/crank input signal transitions low and after a calibrated delay, the hybrid/EV battery energy control module informs the hybrid/EV powertrain control module 2, via serial data communication bus that it is about to run the diagnostics on the 2nd protection circuit. The hybrid/EV battery energy control module then proceeds to command, via internal serial data, each hybrid/EV battery interface control module to run the check on its hardwire output. Each of the four hybrid/EV battery interface control modules pulls the signal circuit low and releases it, in sequence. If any pulses are missing, the hybrid/EV battery energy control module is able to diagnose which hybrid/EV battery interface control module(s) has a fault and sets a related fault and sends this information to the hybrid/EV powertrain control module 2 on the serial data

OBDII Code P1EAC Buick - Hybrid/EV Battery Cell Overvoltage Signal Circuit Performance - AutoCodes.com — P1EAC Buick Code - Hybrid/EV Battery Cell Overvoltage Signal Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1EAC Buick?

Faulty Hybrid Powertrain Control Module 2
Hybrid Powertrain Control Module 2 harness is open or shorted
Hybrid Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC P1EAC 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 P1EAC 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 P1EAC Buick Code

1. What are the common symptoms of OBDII code P1EAC in a Buick Hybrid/EV vehicle?

The common symptoms of code P1EAC may include reduced hybrid system performance, illuminated check engine light, and potential drivability issues.

2. What can cause the OBDII code P1EAC to be triggered in a Buick Hybrid/EV vehicle?

The code P1EAC is typically triggered when the hybrid/EV battery cell overvoltage signal circuit performance is outside of the expected range, indicating a potential issue with the battery or related components.

3. How serious is the OBDII code P1EAC in a Buick Hybrid/EV vehicle?

Code P1EAC should be addressed promptly as it can affect the performance and reliability of the hybrid/EV system. Ignoring this code may lead to further damage to the battery or other components.

4. What are some DIY repair tips for addressing OBDII code P1EAC in a Buick Hybrid/EV vehicle?

DIY repair tips may include checking the battery connections, inspecting the wiring harness for any damage, and ensuring that the battery cells are functioning properly. However, it is recommended to seek professional assistance for accurate diagnosis and repair.

5. Can driving with the OBDII code P1EAC present any risks to the vehicle or driver?

Continuing to drive with code P1EAC may pose risks such as reduced fuel efficiency, potential damage to the hybrid/EV system components, and potential drivability issues. It is advisable to address the issue as soon as possible.

6. How can a mechanic diagnose the OBDII code P1EAC in a Buick Hybrid/EV vehicle?

A mechanic may use a diagnostic scanner to retrieve the specific details of the code, inspect the battery system, test the voltage signals, and perform a thorough inspection of the related components to diagnose the issue accurately.

7. Are there any recalls or technical service bulletins related to OBDII code P1EAC in Buick Hybrid/EV vehicles?

It is recommended to check with the manufacturer or authorized service centers for any recalls or technical service bulletins specific to code P1EAC in Buick Hybrid/EV vehicles to stay informed about potential known issues and solutions.

8. How much does it typically cost to repair OBDII code P1EAC in a Buick Hybrid/EV vehicle?

The cost of repairing code P1EAC can vary depending on the specific underlying issue, parts needed for replacement, labor costs, and the service provider. It is advisable to obtain estimates from reputable repair shops.

9. Can resetting the OBDII code P1EAC on a Buick Hybrid/EV vehicle solve the issue temporarily?

Resetting the code may temporarily turn off the check engine light, but it will not address the root cause of the problem. It is crucial to diagnose and repair the underlying issue to prevent further complications.

10. Is it safe to drive a Buick Hybrid/EV vehicle with the check engine light illuminated due to code P1EAC?

Driving with the check engine light on should be done with caution as it indicates a potential issue with the hybrid/EV system. It is recommended to have the vehicle inspected by a qualified technician to prevent any further damage or safety risks.