AutoCodes – Cadillac – P1FD9 Cadillac

P1FD9 Cadillac Code - Hybrid/EV Battery Interface Control Module 5 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: P1FD9 Cadillac indicates Hybrid/EV Battery Interface Control Module 5 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 815

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 P1FD9 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 P1FD9 Cadillac - Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FD9 Cadillac Code - Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FD9 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 P1FD9 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 P1FD9 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 P1FD9 Cadillac Code

1. What are the common symptoms of OBDII code P1FD9 in a Cadillac Hybrid/EV vehicle?

- Common symptoms include poor fuel economy, reduced engine performance, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P1FD9 in a Cadillac Hybrid/EV vehicle?

- The code may be triggered by issues such as a faulty Hybrid/EV Battery Interface Control Module 5, a damaged voltage sensor, or wiring/connectivity issues.

3. How can I diagnose the root cause of OBDII code P1FD9 in my Cadillac Hybrid/EV vehicle?

- To diagnose the issue, you may need to perform a thorough inspection of the Hybrid/EV battery system, check the voltage sensor circuit, and use an OBDII scanner to gather more diagnostic information.

4. How serious is OBDII code P1FD9 in a Cadillac Hybrid/EV vehicle?

- This code indicates a low voltage condition in the Hybrid/EV battery system, which can affect the overall performance and efficiency of the vehicle. It is recommended to address this issue promptly.

5. Can I continue driving my Cadillac with OBDII code P1FD9 present?

- While the vehicle may still be operational with this code, it is advisable to have the issue diagnosed and repaired as soon as possible to prevent further damage to the Hybrid/EV system.

6. What are some repair tips for fixing OBDII code P1FD9 in a Cadillac Hybrid/EV vehicle?

- Repair tips may include checking and repairing any damaged wiring, replacing the faulty voltage sensor, or resetting the Hybrid/EV Battery Interface Control Module 5 to clear the code.

7. How much does it typically cost to repair OBDII code P1FD9 in a Cadillac Hybrid/EV vehicle?

- Repair costs can vary depending on the exact cause of the issue, but you may expect to pay for parts and labor, ranging from a few hundred to over a thousand dollars.

8. Can I reset OBDII code P1FD9 in my Cadillac Hybrid/EV vehicle without fixing the underlying issue?

- While you can clear the code temporarily by resetting the system, it is crucial to address the root cause to prevent the code from reoccurring and ensure the proper functioning of the Hybrid/EV system.

9. Are there any recalls or technical service bulletins related to OBDII code P1FD9 in Cadillac Hybrid/EV vehicles?

- It is recommended to check with your local Cadillac dealership or the manufacturer's website for any recalls or technical service bulletins related to this specific OBDII code.

10. How can I prevent OBDII code P1FD9 from appearing in my Cadillac Hybrid/EV vehicle in the future?

- Regular maintenance, such as checking the Hybrid/EV system components, ensuring proper wiring connections, and addressing any warning signs promptly, can help prevent the recurrence of this code.