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P1FDD Cadillac Code - Hybrid/EV Battery Interface Control Module 9 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: P1FDD Cadillac indicates Hybrid/EV Battery Interface Control Module 9 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 750

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 P1FDD 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 P1FDD Cadillac - Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FDD Cadillac Code - Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FDD 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 P1FDD 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 P1FDD 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 P1FDD Cadillac Code

1. What does the OBDII code P1FDD mean on a Cadillac?

P1FDD indicates a problem with the Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit, specifically detecting low voltage.

2. What are the common symptoms of the P1FDD code?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, decreased fuel efficiency, or limited battery charging and discharging.

3. What causes the P1FDD code to appear?

Common causes include a faulty voltage sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning Hybrid/EV Battery Interface Control Module.

4. Can a low battery charge trigger the P1FDD code?

A low state of charge is unlikely to trigger the code directly, but issues in the battery management system or voltage sensor may cause it.

5. How is the P1FDD code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the voltage sensor wiring and connectors, and test the Hybrid/EV Battery Interface Control Module for proper operation.

6. Can I still drive with the P1FDD code active?

While you may be able to drive, itâ€™s not recommended as the vehicle may experience reduced hybrid/EV performance or further damage to the battery system.

7. How is the P1FDD code fixed?

Repairs often include replacing the faulty voltage sensor, repairing damaged wiring or connectors, or replacing the Hybrid/EV Battery Interface Control Module if needed.

8. How much does it cost to repair a P1FDD code on a Cadillac?

Repair costs vary, but can range from $200 to $1,500 depending on whether itâ€™s a simple wiring repair or a replacement of the control module.

9. Can a software update fix the P1FDD code?

In some cases, a software update for the Hybrid/EV Battery Interface Control Module may resolve the issue if itâ€™s related to calibration errors.

10. What preventive maintenance can help avoid the P1FDD code?

Regularly inspect the hybrid/EV battery system, ensure wiring and connectors are in good condition, and keep up with recommended service intervals for the vehicle.