AutoCodes – Cadillac – P1FD8 Cadillac

P1FD8 Cadillac Code - Hybrid/EV Battery Interface Control Module 4 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: P1FD8 Cadillac indicates Hybrid/EV Battery Interface Control Module 4 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 739

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 P1FD8 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 P1FD8 Cadillac - Hybrid/EV Battery Interface Control Module 4 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FD8 Cadillac Code - Hybrid/EV Battery Interface Control Module 4 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FD8 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 P1FD8 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 P1FD8 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 P1FD8 Cadillac Code

What does the OBDII code P1FD8 mean for a Cadillac?

The OBDII code P1FD8 indicates that the Hybrid/EV Battery Interface Control Module 4 has detected a low voltage condition in its voltage sensor circuit.

What symptoms might I experience if my vehicle has the P1FD8 code?

Common symptoms include warning lights on the dashboard, reduced hybrid system performance, or the vehicle entering a reduced power mode.

What could cause the P1FD8 code to trigger?

Causes may include a faulty voltage sensor, poor electrical connections, damaged wiring, or issues with the hybrid battery itself.

How can I diagnose the P1FD8 code?

Start by checking the voltage sensor connections and wiring for any damage. Use a multimeter to test the voltage readings and consider scanning for additional codes.

Is it safe to drive my Cadillac with the P1FD8 code?

While it may be safe for short distances, driving with this code can lead to reduced performance and potential damage to the hybrid system, so itâ€™s best to have it checked promptly.

What are some common repair solutions for the P1FD8 code?

Repairs may involve replacing a faulty voltage sensor, repairing damaged wiring, or addressing any hybrid battery issues that may be present.

How much might it cost to fix the P1FD8 code?

Repair costs can vary widely, typically ranging from $100 to $1,000 depending on the specific issue, parts needed, and labor involved.

Can I clear the P1FD8 code myself?

Yes, you can clear the code using an OBDII scanner, but itâ€™s important to address the underlying issue to prevent the code from reappearing.

Should I take my Cadillac to a dealer for P1FD8 code repairs?

While you can take your vehicle to a dealer, many independent mechanics are also qualified to diagnose and repair hybrid systems, often at a lower cost.