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P1FDB Cadillac Code - Hybrid/EV Battery Interface Control Module 7 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: P1FDB Cadillac indicates Hybrid/EV Battery Interface Control Module 7 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 809

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 P1FDB 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 P1FDB Cadillac - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FDB Cadillac Code - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FDB 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 P1FDB 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 P1FDB 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 P1FDB Cadillac Code

What does the OBDII code P1FDB mean for my Cadillac?

The P1FDB code indicates a low voltage condition in the Hybrid/EV Battery Interface Control Module 7 voltage sensor circuit, which can affect the performance of the hybrid or electric vehicle system.

What symptoms might I experience if my vehicle has the P1FDB code?

Common symptoms include warning lights on the dashboard, reduced power or acceleration, and potential issues with the hybrid or electric drive system functioning properly.

What could cause the P1FDB code to trigger in my Cadillac?

Possible causes include a faulty voltage sensor, damaged wiring or connectors in the battery interface, or issues with the hybrid battery itself.

How can I diagnose the P1FDB code effectively?

Start by using an OBD-II scanner to confirm the code, then visually inspect the wiring and connectors associated with the Hybrid/EV Battery Interface. Testing the voltage sensor and battery health can also help pinpoint the issue.

Are there any quick fixes for the P1FDB code?

A quick fix may involve checking and repairing any damaged wiring or loose connectors. However, if the voltage sensor is faulty, it will need to be replaced properly.

What is the recommended repair for the P1FDB code?

The recommended repair often involves replacing the faulty voltage sensor or repairing the wiring harness. It's advisable to also check the hybrid battery for any underlying issues.

Can I drive my Cadillac if the P1FDB code is present?

While it may be possible to drive, it is not recommended as it could lead to reduced performance or further damage to the hybrid system. It's best to address the issue promptly.

How much will it cost to repair the P1FDB code?

Repair costs can vary widely, typically ranging from $100 to $500, depending on whether you need to replace the voltage sensor, repair wiring, or service the hybrid battery.

Is it safe to clear the P1FDB code without fixing the issue?

Clearing the code without addressing the underlying problem is not safe, as it may lead to further issues or failure of the hybrid system. Always investigate and repair the root cause.