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P1FDE Cadillac Code - Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit Low Voltage

Quick Answer

The hybrid battery contains 192 individual cells. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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: P1FDE Cadillac indicates Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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 700

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 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1FDE Cadillac Description

The hybrid battery contains 192 individual cells. Two cells are welded together in parallel and called a cell group. There are a total of 96 cell groups in the hybrid battery 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 cell groups are joined to form 3 distinct sections. The first 24 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 73 through 96. The next 28 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 45 through 72. The transverse battery section is section number 3 and it contains the remaining 44 battery cell groups 1 through 44. The battery sections also contain two temperature sensors, with one sensor located at each end of the section.
The battery energy control module monitors the voltage of the 96 battery cell groups. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the battery energy control module.
The battery energy control module contains internal interface control modules that monitor specific cell groups.
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 the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1FDE Cadillac - Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FDE Cadillac Code - Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FDE Cadillac?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P1FDE 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 P1FDE 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 P1FDE Cadillac Code

1. What does the OBDII code P1FDE mean on a Cadillac?

P1FDE indicates a low voltage issue in the Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit, which monitors the voltage levels in the hybrid or EV battery system.

2. What are the common symptoms of code P1FDE in a Cadillac?

Symptoms may include the check engine light turning on, reduced hybrid or EV performance, limited power mode activation, or difficulty in charging the battery.

3. What causes the P1FDE code to appear?

The code can be triggered by a faulty voltage sensor, damaged or corroded wiring, connector issues, or a malfunctioning Hybrid/EV Battery Interface Control Module.

4. Can I drive my Cadillac with a P1FDE code?

Driving with a P1FDE code is not recommended, as it may lead to reduced performance or further damage to the hybrid or EV battery system.

5. How do I fix the P1FDE code on my Cadillac?

Repairs may involve inspecting and repairing wiring or connectors, replacing the voltage sensor, or in some cases, replacing the Hybrid/EV Battery Interface Control Module.

6. How is the P1FDE code diagnosed?

A technician will use a scan tool to confirm the code, inspect the voltage sensor circuit, check for damaged wiring or connectors, and test the interface control module.

7. Can a dead battery trigger the P1FDE code?

While unlikely, a severely discharged or faulty hybrid/EV battery could potentially cause voltage irregularities and trigger this code.

8. Is the P1FDE code covered under warranty?

This depends on your vehicle's warranty coverage. Hybrid/EV components often have extended warranties, so check with your dealership.

9. What tools are needed to diagnose the P1FDE code?

Diagnosis typically requires an advanced OBDII scan tool, a multimeter for testing voltage, and possibly manufacturer-specific diagnostic equipment.

10. How much does it cost to repair a P1FDE code on a Cadillac?

Repair costs can vary widely, ranging from $100 for simple wiring repairs to over $1,000 if the Hybrid/EV Battery Interface Control Module needs replacement.