AutoCodes – Generic – P1FDD

P1FDD 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 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 872

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

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?

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 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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Information for Specific Makes

P1FDD Buick — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage
P1FDD Cadillac — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage
P1FDD Chevrolet — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage
P1FDD GMC — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage
P1FDD Saturn — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage

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 Code

1. What are common symptoms of OBDII code P1FDD (Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage)?

The common symptoms include reduced hybrid/EV performance, decreased fuel efficiency, and illuminated warning lights on the dashboard.

2. What are possible causes of the Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage code?

Possible causes may include a faulty voltage sensor, issues with the battery interface control module, wiring problems, or a low battery voltage.

3. How can I diagnose the root cause of code P1FDD?

To diagnose the root cause, you may need to perform a thorough inspection of the voltage sensor, check the battery interface control module connections, and test the voltage levels in the hybrid/EV battery system.

4. Can a DIY enthusiast repair OBDII code P1FDD at home?

Repairing this code may require specialized tools and expertise, so it is recommended to seek assistance from a professional mechanic or a dealership with experience in hybrid/EV systems.

5. Is it safe to continue driving with the Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Circuit Low Voltage code?

Continuing to drive with this code present can result in further damage to the hybrid/EV system, so it is advisable to have the issue addressed promptly to avoid potential safety hazards.

6. How much does it typically cost to repair OBDII code P1FDD?

The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the voltage sensor, repairing wiring, or addressing other related components. Prices can range from a few hundred to a few thousand dollars.

7. Can a weak or failing hybrid/EV battery cause code P1FDD to appear?

Yes, a weak or failing hybrid/EV battery can contribute to the appearance of this code due to low voltage levels affecting the sensor circuit.

8. Are there any preventive maintenance tips to avoid encountering code P1FDD?

Regularly inspecting the hybrid/EV battery system, ensuring proper charging, and addressing any warning signs promptly can help prevent issues that may lead to code P1FDD.

9. How long does it usually take to repair OBDII code P1FDD?

The repair time for this code can vary based on the specific diagnosis and repair needed, but it may take a few hours to a full day to address the underlying cause effectively.

10. Can code P1FDD be reset using an OBDII scanner after the repair is completed?

Yes, once the underlying issue causing the code has been fixed, an OBDII scanner can be used to clear the code and reset the system to ensure the problem has been resolved successfully.