AutoCodes – Cadillac – P1E66 Cadillac

P1E66 Cadillac Code - Hybrid/Electric Vehicle Battery 59 Circuit

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P1E66 Cadillac indicates Hybrid/Electric Vehicle Battery 59 Circuit.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 742

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 Mar 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E66 Cadillac Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1E66 Cadillac - Hybrid/Electric Vehicle Battery 59 Circuit - AutoCodes.com — P1E66 Cadillac Code - Hybrid/Electric Vehicle Battery 59 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E66 Cadillac?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1E66 Cadillac?

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 P1E66 Cadillac 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 P1E66 Cadillac Code

1. What are common symptoms of OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- Common symptoms include a decrease in hybrid system performance, reduced fuel efficiency, and potential issues with starting the vehicle.

2. What are some possible causes of OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- Possible causes include a faulty hybrid/electric vehicle battery, issues with the battery management system, wiring problems, or a malfunctioning battery temperature sensor.

3. How can I diagnose the issue related to OBDII code P1E66 Cadillac for the Hybrid/Electric Vehicle Battery 59 Circuit?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault codes, inspecting the hybrid/electric vehicle battery and related components, and checking the battery voltage and temperature readings.

4. Is it safe to continue driving with OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- It is not recommended to continue driving with this code present, as it may lead to further damage to the hybrid system components and potentially compromise the vehicle's overall performance and safety.

5. How can I repair OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- Repairing this code may involve replacing a faulty hybrid/electric vehicle battery, addressing wiring issues, recalibrating the battery management system, or resetting the fault codes using a diagnostic tool.

6. Can I reset the OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit on my own?

- While you can attempt to clear the fault code using an OBDII scanner, it is essential to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it cost to repair OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- The cost of repair can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates at the repair facility. It is recommended to obtain quotes from multiple mechanics for an accurate estimate.

8. Will OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit affect my vehicle's emissions or registration?

- Yes, unresolved issues related to this code can potentially impact your vehicle's emissions output and compliance with local regulations, which may lead to registration or inspection problems.

9. How often does OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit occur in Cadillac vehicles?

- This code is relatively uncommon but can occur in Cadillac hybrid or electric vehicles experiencing issues with the battery system or related components.

10. Are there any preventative maintenance steps I can take to avoid OBDII code P1E66 Cadillac related to the Hybrid/Electric Vehicle Battery 59 Circuit?

- Regularly checking and maintaining the hybrid/electric vehicle battery, monitoring system performance, and addressing any warning signs promptly can help prevent issues that may trigger this fault code.