AutoCodes – Cadillac – P1E51 Cadillac

P1E51 Cadillac Code - Hybrid/Electric Vehicle Battery 38 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: P1E51 Cadillac indicates Hybrid/Electric Vehicle Battery 38 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 834

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 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E51 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 P1E51 Cadillac - Hybrid/Electric Vehicle Battery 38 Circuit - AutoCodes.com — P1E51 Cadillac Code - Hybrid/Electric Vehicle Battery 38 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E51 Cadillac?

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

How to Fix the DTC P1E51 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 P1E51 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 P1E51 Cadillac Code

1. What does OBDII code P1E51 for Cadillac Hybrid/Electric Vehicle Battery 38 Circuit indicate?

The code P1E51 signifies a fault in the circuit related to the hybrid/electric vehicle battery 38 in a Cadillac.

2. What are common symptoms of OBDII code P1E51 in a Cadillac?

Common symptoms of P1E51 may include reduced hybrid/electric vehicle performance, warning lights on the dashboard, and potential issues with the battery system.

3. What are the possible causes of OBDII code P1E51 in a Cadillac?

Causes of P1E51 may include faulty battery cells, damaged wiring or connectors, issues with the battery management system, or a malfunctioning hybrid/electric vehicle control module.

4. How can I diagnose OBDII code P1E51 in my Cadillac?

Diagnosing P1E51 typically involves using an OBDII scanner to retrieve the code, inspecting the hybrid/electric vehicle battery 38 circuit for visible damage, and conducting electrical tests on the components involved.

5. Can I continue driving my Cadillac with OBDII code P1E51 present?

It is not recommended to drive your Cadillac with the P1E51 code active, as it may lead to further damage to the hybrid/electric vehicle system. It's best to address the issue promptly.

6. How can I repair OBDII code P1E51 in my Cadillac?

Repairing P1E51 may involve replacing damaged battery cells, repairing or replacing faulty wiring or connectors, resetting the battery management system, or reprogramming the hybrid/electric vehicle control module.

7. Is it safe to reset the OBDII code P1E51 in my Cadillac using an OBDII scanner?

While resetting the code with an OBDII scanner may temporarily clear the error, it is crucial to address the underlying issue causing P1E51 to prevent further problems with the hybrid/electric vehicle system.

8. How much does it cost to repair OBDII code P1E51 in a Cadillac?

The cost of repairing P1E51 can vary depending on the specific issue causing the code, the parts needed for repair, and the labor rates of the repair facility. It's recommended to obtain quotes from reputable mechanics.

9. Can a DIY enthusiast fix OBDII code P1E51 in a Cadillac?

Attempting a DIY repair for P1E51 may be challenging due to the complexity of the hybrid/electric vehicle system. It's advisable to seek professional help or guidance if you're unsure of how to proceed.

10. How often does OBDII code P1E51 occur in Cadillac hybrid/electric vehicles?

The occurrence of P1E51 can vary among Cadillac hybrid/electric vehicles, with factors such as vehicle age, maintenance history, and driving conditions influencing the likelihood of encountering this fault code.