AutoCodes – Generic – P1E66

P1E66 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 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 1,270

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

What does this mean?

What are the Possible Causes of the DTC P1E66?

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

How to Fix the DTC P1E66?

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 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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Need Help with the Code?

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Information for Specific Makes

P1E66 Acura — Motor Angle Sudden Change
P1E66 Buick — Hybrid/Electric Vehicle Battery 59 Circuit
P1E66 Cadillac — Hybrid/Electric Vehicle Battery 59 Circuit
P1E66 Chevrolet — Hybrid/Electric Vehicle Battery 59 Circuit
P1E66 GMC — Hybrid/Electric Vehicle Battery 59 Circuit
P1E66 Honda — Motor Angle Sudden Change
P1E66 Saturn — Hybrid/Electric Vehicle Battery 59 Circuit

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 Code

1. What does the OBDII code P1E66 indicate?

P1E66 refers to an issue with the Hybrid/Electric Vehicle Battery 59 Circuit, typically indicating a fault in the communication or performance of a specific battery module or circuit.

2. What are the common symptoms of a P1E66 code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited electric mode operation, decreased vehicle performance, or a warning message related to the hybrid system.

3. What causes the P1E66 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the circuit, a malfunctioning battery control module, or internal corrosion affecting connectivity.

4. Can the P1E66 code cause drivability issues?

Yes, it can lead to reduced performance, limited hybrid functionality, or even prevent the vehicle from operating in electric mode.

5. Is it safe to drive with a P1E66 code?

Driving with this code may be possible in some cases, but it's not recommended as it could cause further damage to the hybrid battery system or leave you stranded.

6. How is the P1E66 code diagnosed?

Diagnosis involves scanning for additional codes, inspecting the wiring and connectors in the battery circuit, and testing the battery modules and control module for faults.

7. What repairs are typically required to fix a P1E66 code?

Repairs may include replacing a faulty battery module, repairing damaged wiring or connectors, or reprogramming or replacing the battery control module.

8. Can a weak 12-volt battery cause a P1E66 code?

While unlikely, a weak 12-volt battery can sometimes cause hybrid system errors. Itâ€™s best to test and rule out the 12-volt battery as part of the diagnosis.

9. How much does it cost to fix a P1E66 code?

Costs vary depending on the exact issue. Wiring repairs may be inexpensive, but replacing a hybrid battery module or control unit could cost hundreds or even thousands of dollars.

10. Can I reset the P1E66 code without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the warning but will not resolve the problem, and the code is likely to return.